Aquatic Therapy for Persons with Neuromuscular Diseases

Abstract

Background:

Aquatic exercise is among the most common physical activity modalities performed by people with disabilities.

Objective:

The present paper reviews currently-available research on aquatic therapy (AT) for persons with neuromuscular diseases (NMD).

Methods:

A scoping review of the existing literature was conducted on PubMed, Embase, Medline, Scopus, Web of Science, SPORTdiscus, CINAHL and Lilacs from the earliest date available until October 2020. It follows the methodological framework for conducting a scoping review proposed by the Joanna Briggs Institute.

Results:

A total of 28 articles were analyzed and the study parameters grouped by the topography of NMD; most of the studies (n = 16) addressed myopathies. A considerable increase in the number of studies was found over time, and heterogeneity was identified across and within AT interventions for persons with NMD; hence, to allow more effective interpretation of study results, there is a need to standardize the fundamental parameters and procedures for AT.

Conclusions:

This scoping review provides a comprehensive outline of available literature; the findings could serve as a starting point for clinical studies on the effects of AT on persons with NMD, and encourage a more coherent approach to their design.

Keywords

Hydrotherapy muscular dystrophy myopathy scoping review neuromuscular diseases

INTRODUCTION

Neuromuscular diseases (NMD) comprise a wide group of progressive, acquired or hereditary diseases that affect the peripheral nervous system, anterior horn cells, nerve roots, plexi, peripheral nerves, neuromuscular junction and/or muscles [1 –4]. The onset of symptoms may occur in childhood or adulthood, and life expectancy depends on the type of disorder and the severity of its evolution [2, 5]. Each type of NMD has a heterogeneous and complex nature affecting multiple body systems [4]. Structural and functional changes arise with the progression of the disease [6 –9], most of which affect functional mobility, balance [10] and respiratory function [11]. Some NMDs are characterized by a progressive decline in respiratory function; this results in a cardiopulmonary intolerance to exercise that impairs activities of daily living (ADL) and social participation among patients [12].

The guidelines developed by NMD care groups recommend the use of low-impact exercises [13] that can be performed during aquatic therapy (AT) [6 –9]. These exercises combine strengthening activities and aerobic exercise to maintain structure and function [14, 15]. Currently, such aquatic exercise is among the most common physical activities chosen by children with neuromotor disorders [16, 17] and can be used in all phases of disease progression. The aquatic environment provides a series of hydrostatic and hydrodynamic characteristics [18], which make exercise feasible for persons with NMD, as when not supported by the water, they can no longer perform movements against gravity. The buoyancy provided by the water provides support and unloads the joints, allowing persons with NMD to move freely while performing task-specific exercises associated with daily life; should they perform such movements out of the water, they could experience significant pain or problems in physical functioning [19]. In addition, the hydrodynamic resistance ensures the use of multi-directional strengthening exercises to improve cardiovascular health [18]. Furthermore, the aquatic setting helps people to maintain gross motor function [20], allows neuropathic patients to improve their balance and gait in without risk of falling or pain [21], and offers an enriched environment that motivates participation, optimizing the functioning of persons with NMD [22].

However, although AT has demonstrated clear benefits in treating other neurological pathologies of the central nervous system [23 –25], its application is less common among persons with NMD. This may be due to the lack of validated protocols, the comparatively small number of professionals with proper training, and the various accessibility problems associated with the technique [22].

The objective of a scoping review is to assess the extent of a body of literature on a particular topic, with a key goal being to examine emerging evidence to ensure that further research in that area would be beneficial [26]. Furthermore, a scoping review should identify a sufficient number of studies and inform researchers as to whether a full systematic review is needed [27]. Three recent systematic reviews which assessed the effects of AT on patients with neurological problems [23 –25] did not provide much information about people with NMD.

In order to provide wide coverage of the available publications, the following two research questions were formulated: What research on AT for persons with NMD is currently available, and how has AT been applied in persons with NMD? Hence, the main purpose of this study was to map the available research interventions on AT for individuals with NMD; more specifically, to describe the characteristics of the study groups and the procedures performed, and identify the outcome measurements in AT research.

MATERIALS AND METHODS

The study followed the methodological framework for conducting a scoping review proposed by the Joanna Briggs Institute [26]. This framework comprises nine stages: 1) Defining and aligning the objective/s and question/s; 2) Developing and aligning the inclusion criteria with the objective/s and question/s; 3) Describing the planned approach to the evidence search and selection, as well as data extraction and presentation of the evidence; 4) Searching for the evidence; 5) Selecting the evidence; 6) Extracting the evidence; 7) Analyzing the evidence; 8) Presenting the results; 9) Summarizing the evidence in relation to the purpose of the review, making conclusions and noting any implications of the findings. Stages 1–3 were executed during the preparation of the scoping review. Stages 4–6 are presented in the Methods section, stages 7–8 in the Results section and stage 9 in the Discussion and Conclusions. The present study was based on the PRISMA-ScR (Preferred Reporting Items for Systematic reviews and Meta-Analyses extension for Scoping Reviews) checklist [28].

Searching for the evidence

A comprehensive search was conducted in October 2020 by two independent reviewers in eight data sources: PubMed, Embase, MEDLINE, Scopus, Web of Science, SPORTdiscus, CINAHL and Lilacs. The search used two groups of keywords. The first group described all types of NMDs with Medical Subject Headings (MeSH terms) (Table 1). The terms were connected with the Boolean search operator “OR”. The second group examined the intervention, and the search comprised a combination of the following keywords: aquatic exercise OR aquatic physical therapy OR swimming OR aquatic therapy OR water exercise. There was no date limit for the search.

Table 1

Terms Describing Neuromuscular Diseases

Structure affected	Disease (MeSH terms)
CNS	Primary lateral sclerosis
Upper motor neuron and / or lower motor neuron diseases	Amyotrophic Lateral Sclerosis
	Progressive bulbar pals^*
	Progressive muscular atrophy^*
	Spinal muscular atrophy^*
	Poliomyelitis
	Post-poliomyelitis Syndrome
PNS	Neurophathy^*
Neuropathies	Polyneuropathy^*
	Charcot-Marie-Tooth Disease
	Guillain-Barre Syndrome
	Dejerine-Sottas Disease
	Disease, refsum
	Krabbe Disease
Neuromuscular junction	Myasthenia Gravis
	Myasthenic Syndrome
	Botulism
Myopathy	Muscular Dystrophy^*
	Myotonic Dystrophy^*
	Myopathy^*

CNS – central nervous system; MeSH – Medical Subject Headings; PNS – peripheral nervous system.

The reference lists of all included articles were hand-searched for new articles. The authors also checked their own libraries for additional literature.

Selecting the evidence

Study selection was conducted independently by at least two authors, who were native speakers of Spanish and fluent in English and Portuguese. The first step in study selection consisted of analyzing titles and abstracts; this step included articles written in English, Spanish and Portuguese describing active AT in persons with NMD. The following exclusion criteria were applied: animal studies; passive AT used for persons with NMD; articles describing treatments other than AT and/or with study groups other than persons with NMD; reviews or meta-analysis.

The second step was to analyze the full texts of the potentially relevant papers. The studies eligible for inclusion must describe the content of the intervention: who received it, where it occurred, and how it was delivered. The following were excluded: any articles which presented passive AT, any articles without intervention, or any articles that were not original, lacked full text or were not in English, Spanish or Portuguese. Inclusion of each paper was based on the assessment from two independent reviewers and full agreement was required. In the case of disagreement, consensus was reached by consulting a third reviewer.

Extracting the evidence

The following descriptive data were extracted: the name of the first author, year of publication, study design, primary research question, sample size, age and gender of the participants, diagnosis, intervention description, measuring instrument and outcome, water temperature. The tables were organized based on the participants’ diagnosis. Data extraction for the included studies was divided between six authors according to their ability in the language of the article.

RESULTS

The database search revealed 2171 records, and another 15 were found through other sources. A flow diagram of the identified studies is presented in Fig. 1. After excluding duplicates using EndNote 20 software, 1479 records were screened based on the title and abstract. Full-text versions of 89 articles were assessed for eligibility. Finally, 31 articles met the inclusion criteria. Two studies presented the same data [29, 30]; in this case, the one with less information was excluded [30]. Another two studies did not present enough information about AT [31, 32], more specifically with regard to inclusion criteria of the second step of the study selection, and these were also excluded. The final analysis therefore included data from 28 articles. All included articles had been published in peer-reviewed journals. Eleven of the included articles were published in Portuguese with an English abstract. Out of 28 studies, 18 (64%) had been published after 2010.

Fig.1

Flow Diagram of Identified Publications.

Regarding the type of study, 19 were descriptive case studies [29 , 33–50], four were quasi-experimental studies [19 , 51–53], two were randomized clinical trials [20, 21], one was a longitudinal prospective study [54], one was a longitudinal retrospective study [55] and one was a cross-sectional study [56]. The outcomes of analyzed studies were grouped into the following general categories (Table 2): functional performance (walking, balance, activities of daily living), physiological domain (cardiorespiratory, strength and somatic aspects), psychosocial domain (quality of life, pain, physical, psychological, mental, emotional and social aspects) and aquatic skills.

Table 2

Measurements Under General Outcome Categories

Functional performance	Physiological domain	Psychosocial domain	Aquatic skills
• 6MWT – 6-Minute Walk Test	• BMI – Body Mass Index	• Beck Anxiety Inventory	• WOTA 1 – Water Orientation Test Alyn 1
• 10MWT – 10 Meter Walk Test	• EMG – electromyography	• Carer quality of life questionnaire	• Aquatic skills evaluation (Likert scale)
• ACTIVELIM – Activity Limitations Measure	• Flow Volume	• Neuropathic Pain Scale
• Barthel Index	• FM – fat mass	• Pediatric quality of life inventory
• BBS – Berg Balance Scale	• Forced expiratory volume in one second	• Self-Perception Profile for Adolescents
• Conley Scale	• FVC – forced vital capacity	• SF36 – Short Form (36) Health Survey
• Dynamic Gait Index	• HR – heart rate	• VAS – Visual Analog Scale
• EK – Egen Classification Scale	• Inspired volume	• Child Health Utility 9D Index
• Fatigue severity scale	• MEP – maximum expiratory pressure	• Child Stress Symptoms Inventory
• Functional Ambulation Classification	• Medical Research Council Scale
• Functional Independence Measure	• MIP – maximum inspiratory pressure
• Gross Motor Function Measure-88	• MMT- Manual Muscular Test
• MFM – Motor Function Measure	• MV – minute volume
• NSAA – North Star Ambulatory Assessment	• O₂ Sat – oxygen saturation
• Overall Neuropathy Limitations Scale	• Peak VO₂_– peak oxygen consumption
• Peabody Developmental Motor Scales-2^nd Edition	• Peak expiratory flow
• PEDI – Pediatric Evaluation of Disability Inventory	• Respiratory frequency
• Physical Activity Scale for the Elderly	• ROM – range of motion
• Senior Fitness Test	• Thoracic cirtometry
• TUG – Timed Up and GO Test	• VC – vital capacity
• Vignos Scale	• Volume of inhaled air

Regarding the topography of NMD, 16 studies addressed myopathies, eight examined central nervous system (CNS) diseases, three described the use of AT for peripheral nervous system (PNS) diseases and one study reported sample including various NMDs [54]. No studies reporting the use of AT for neuromuscular junction disorders.

Myopathy

Sixteen studies included persons with myopathy (Table 3), including eleven on Duchenne Muscular Dystrophy (DMD), [20 , 56] three on Limb-girdle Muscular Dystrophy (LGMD) [36 , 56] and one on congenital Muscular Dystrophy (MD) [48]; two studies did not report the type of MD [33, 47]. Overall, the sixteen studies represented a total of 122 participants, of whom > 95% were male with DMD (n = 114) and MD (n = 4), and about 5% were female with LGMD and MD; the age ranged from two to thirty-five years old. Six studies used a standardized assessment of the Egen Klassification Scale (EK), the North Star Ambulatory Assessment, the Motor Function Measurement and the Vignos Scale, either to characterize the participants or as an outcome measure.

Table 3

Study Characteristics – Research on Myopathy

Reference	Study aim	Sample	Intervention program	Exercise parameters	Water temperature	Measuring instrument and outcome	Study design
Adams &Chandler (1974) [33]	NR	MD; Type: NR n = 3 (M) Case 1:11 years Case 2:13 years Case 3:15 years Functional Status: level 6	AT (extended breath-holding, blowing water games, bobbing) + positive pressure therapy (breathing and increasing chest wall method)	Phase 1: AT (30 min, 3 days/week for 4 months) + positive pressure therapy (1 day/week for 4 months)	NR	Pre/post phase: Phase 1 VC: Case 1: ↑8%; Case 2: ↑3%; Case 3: ↑4% Phase 2 VC: Case 1: ↑14%; Case 2: no change; Case 3: ↑11% Phase 3 VC: Case 1: ↑13%; Case 2: ↑7%; Case 3: ↑3%	Case study
				Phase 2: AT (30 min, 3 days/week, duration NR) + positive pressure therapy (2 days/week, duration NR)
				Phase 3: AT (20 min, 4 days/week for 5 weeks) + positive pressure therapy (NR)
Atamturk &Atamturk (2018) [35]	To investigate the impact of activity on physical and psychological health	DMD n = 1 (M) 6 years	AT (warm-up, breathing exercises, water adaptation activities, stretching, gross motor movements, cooldown)	45 min, 2 days/week for 8 weeks	NR	Post intervention	Case study
						– Parents semi-structured interview:
						↑ socialization and quality of life
						slept better, got calmer and more confident
Caromano et al. (1998) [56]	To study the effects of physiological aspects of immersion	DMD n = 20 (M) 8–15 years	AT (general active exercises, walking and breathing exercises)	40 min, 1 session	30–32°C	Pre (land, water) and post intervention (land):	Cross-sectional
						– HR: ↓7.3 bpm (water), no change (post on land)
						– MEP: ↑7.40 cmH₂O (water); ↓6.80 cmH₂O (post on land)
						– MIP: ↓8 cmH₂O (water); ↑3.80 cmH₂O (post on land)
						– O₂ Sat: ↓2.7% (water); ↑ 1.8% (post on land)
						– Oral temperature: no change
DiBiasio et al. (2015) [36]	To describe the effects and viability of an individualized AT	LGMD n = 1 (F) 12 years	AT (walking, supine flutter kick, jumping in place in 5 feet of water, semi-prone breast stroke with a noodle, modified backstroke, active stretching, static standing, tall kneeling, and running with a floating barbell, cool down)	45 min, 2 days/week for 32 weeks	28–30°C	Pre (6–8 weeks before intervention) and post intervention	Case study
						– BMI: ↑4.10 kg/cm
						– Dynamometry: ↑ right knee flexion and extension
						– FVC: no change
						– Maximum ventilation volume:
						↑ 8%
						– Passive ROM: ↑ hip flexion/ extension, right knee extension, shoulder flexion; ↓ dorsiflexion and left knee extension
						-PEDI: ↑ mobility and social function; ↓ self-care and mobility
						– Self-Perception Profile for Adolescents: ↑ all areas except physical appearance
						– Swimming skills: ↑
						– Time spent in target HR zone:
						↑15%
Fachardo et al. (2004) [37]	To verify if the AT is capable to delay the progression of the pathology	DMD n = 1 (M) 9 years	AT (stretching, strengthening of the upper limbs and lower, balance, trunk control, breathing exercises, cool down)	40 min, 3 days/week for two phases of 7 weeks	30–32°C	Pre/post phase	Case study
						– Evaluation of activities functional disorders:
						Phase 1: ↓2 pts; Phase 2: ↓1 pts
Ferreira et al. (2015) [55]	To compare the motor function on land and in the water over a 2-year period	DMD n = 23 (M) 15.1 (4.2) years	AT (water adaptation, balance in sitting and standing position, exercises for trunk, upper and lower limbs, rotations of Halliwick Method, gait training, backstroke, cool down) + PT (stretching, joint mobilizations, active and assisted exercises, balance, standing with orthoses, walking)	AT (40 min, 1 day/week for 2 years) + PT (50 min, 2 days/week for 2 years)	34°C	Pre/post for each 6 months	Quasi-experimental
						– Aquatic skills evaluation (Likert scale): ↑2.65 pts
						– EK: ↑0.96 pts
						– Vignos Scale: ↑0.65
Hind et al. (2017) [20]	To assess the clinical effectiveness of AT in maintaining physical function	DMD n = 12 (M) EG: n = 8 8 (0.9) years CG: n = 4 9.8 (2.5) years	EG: AT (stretching, upper and lower limbs exercises, balance, trunk control) + self-administered PT (stretching, strengthening using gravity as the resistance) CG: Self-administered PT (stretching, strengthening using gravity as the resistance)	EG: AT (30 min, 2 days/week for 6 months) + Self-administered PT (4 days/week for 6 months) CG: Self-administered PT (6 days/week for 6 months)	34–36°C	Pre/post intervention	RCT
						– 6MWT: EG ↓22 m; CG: ↓105 m
						– Activity limitations measure: EG: ↓3.50 pts; CG: ↓11.67 pts
						– Carer quality of life questionnaire: EG: ↑10.67 pts; CG:↑18.83 pts
						– Child Health Utility 9D Index— health state utility: EG:↑0.10 pts; CG: ↑0.03 pts
						– FVC: EG: ↓7%; CG: NR
						– North Star Ambulatory Assessment: EG: ↓2.75 pts; CG: ↓5 pts
Honório et al. (2013) [29]	To determine whether AT is beneficial in terms of functional mobility	DMD	AT (functional mobilisation)	45 min, 1–2 days/week for 89 weeks	NR	Five evaluations (periods NR)	Case study
		n = 7 (M)				– BMI: AT: ↓2.07 kg/m²; no PA:
		AT: n = 1				↑1.91(1,27)kg/m²
		No PA: n = 6				– EK: AT:↑8pts; no PA: ↑8.83 (2.78) pts
		9–11 years				– FM: AT: ↑4.22%; no PA: ↑4.29 (2.29)%
Israel (2018) [38]	To evaluate an intervention for aquatic motor skills learning in patients with LGMD	LGMD	AT (body rotations, swimming, gait)	30 min, 1 day/week for 15 weeks	33–34°C	Pre/post intervention	Case study
		n = 2 (F)				– Aquatic Functional Assessment Scale:
		Case 1:33 years Case 2:32 years				Acclimation phase: Case 1: ↑1.8 pts; Case 2:↑1.0 pts
						Mastering of the liquid medium phase: Case 1: ↑1.5 pts; Case 2: ↑2.8 pts
						Specific therapeutic exercises phase: Case 1: ↑0.5 pts; Case 2: ↑1,7 pts
						Global body conditioning phase: Case 1: ↑2.0 pts; Case 2: ↑2.5 pts
Nunes et al. (2008) [44]	To measure changes on stress in a child under AT	DMD	AT (Halliwick method, Bad Ragaz and hydro kinesiotherapy)	45 min, 2 days/week for 10 sessions	33–34°C	Pre/post intervention	Case study
		n = 1 (M)				– Child Stress Symptoms Inventory:
		10 years				↓42 pts
Ramos et al. (2008) [52]	To evaluate the respiratory muscle force and peak flow in patients with DMD exposed to non-invasive ventilation and AT	DMD	EG: AT (passive stretching, passive and active-free mobilizations of knees, hips and shoulders) + non-invasive ventilation	EG: 30 min, 2 days/week for 20 sessions CG: 30 min, 2 days/week for 20 sessions	NR	Pre/post 10th session and post intervention	Quasi-experimental
			CG: AT (passive stretching, passive and active-free mobilizations of knees, hips and shoulders)
		n = 6 (M) EG: n = 3				– MEP: EG: ↓1.4 cmH₂0; CG: ↑10.7 cmH₂0 – MIP: EG:↓1.4 cmH₂0; CG:↑1.3 cmH₂0
		17,6 (1,2) years				– Peak expiratory flow: EG: no change; CG: ↑33,4 L/min
		CG: n = 3
		13,5 (0,5) years
Sales et al. (2004) [46]	To verify the effects of breathing exercises	DMD	AT (body segment movements, breathing exercises, diving, relaxation)	30 min, 1 day/week for 6 months	34°C	Six measurements (one per month)	Case study
		n = 1 (M)				– Respiratory frequency: ↓3 rpm/min
		6 years				– Thoracic cirtometry: ↑1.5 cm in thoracic perimeter during inspiration
						– VC: no change
Sanders &Torres (2010) [47]	To analyze the effect of aquatic exercise on pain, fitness, and independence for ADL	MD Type: NR	AT (walking, jogging, rocking, kicking, jumping, and scissors)	NR	NR	2nd month of intervention	Case study
		n = 1 (F)				↓ back pain
		35 years				4th month of intervention
						↓ back pain ↑ arms and legs strength
						8th month of intervention
						water walking distance: 80 steps,
						1st year of intervention
						↓ back pain, ↑ flexibility of hips and knees, HR rest: 66 bpm, ↑ independence in ADL
						5-year follow up
						↑ body fat, ↑ resting HR, ↓ mobility and strength, pain: no change
Santos et al. (2016) [48]	To verify the AT interference in velocity and energy expenditure during seated commuting on a flat surface, and functional reach	MD Type: Congenital n = 1 (M)	AT (trunk mobilization, abdominal muscle activation, seated displacement training)	35 min, 2 days/week for 12 weeks	33°C	Pre/post intervention	Case study
						– Energy expenditure index adapted for sitting position: ↓252,31 bpm
		6 years				– Functional Reach Test: ↑16 cm
						– EMG in immersion:↑activation of bilateral rectum abdominal and bilateral lumbar square
						– MFM: ↑4.,29%
						– Sitting displacement time (2.0 meters): ↓19 s
Silva et al. (2012) [49]	To verify the impact of AT on non-ambulatory children	DMD	AT (passive mobilization, exercises to upper and lower limbs and trunk flexibility; active exercises for the upper and lower limbs; respiratory exercises; training of the function placing a wheelchair inside the pool)	60 min, 10 sessions	32°C	Pre/post intervention	Case study
		n = 1 (M)				– EK: no change
		12 years				– Flow Volume: ↓8%
						– FVC: no change
						– MEP: no change
						– MIP: ↑11%
						– Minute Volume: ↓16%
						– O₂Sat: ↑3%
						– Peak cough flow: ↓21%
						– Respiratory Frequency: ↓29%
Voos et al. (2020) [53]	To describe the evolution of timed immersion expiration in patients with MD in one-year follow-up	DMD	AT (targeted trunk, upper and lower limbs control, breathing exercises, throwing, catching a ball, stretching, joint mobilization) + PT (passive stretching, exercises to recruit trunk, lower and upper limbs muscles, transferring from prone, supine, sitting, kneeling, half-kneeling, standing and dynamic balance, gait)	AT (60 min, 2 days/week for 1 year) + PT (60 min, 2 days/week for 1 year)	NR	Pre/post intervention	Quasi-experimental
		n = 41 (M)				– FVC: DMD:↓5%; LGMD: ↓5%
		16 (6.2) years				– MFM: DMD:↓2pts; LGMD: ↓2 pts
		LGMD				– Peak expiratory flow:
		n = 16 (NR)				DMD:↓10 mL; LGMD: ↓30 mL
		28 (7.2) years				– Timed immersion mouth expiration:
						DMD:↑1s; LGMD: ↑2 s
						– Timed immersion nose expiration:
						DMD:↑1s; LGMD: ↑5 s

↑ – increase of the parameter; ↓ – decrease of the parameter; 6MWT – 6-Minute Walk Test; ADL – activities of daily living; AT – aquatic therapy; BMI – Body Mass Index; bmp – beats per minute; CG – control group; DMD – Duchenne Muscular Dystrophy; EG – experimental group; EK – Egen Classification Scale; EMG – electromyography; F – female; FM – fat mass; FVC – forced vital capacity; HR – heart rate; LGMD – Limb-girdle Muscular Dystrophy; M – male; MD – muscular dystrophy; MEP – Maximum Expiratory Pressure; MFM – Motor Function Measure; MIP – Maximum Inspiratory Pressure; NR – not reported; O₂ Sat – oxygen saturation; PA – physical activity; Peak VO₂ – peak oxygen consumption; PEDI – Pediatric Evaluation of Disability Inventory; PT – physiotherapy; RCT – randomized clinical trial; ROM – range of motion; VC – vital capacity.

The mean duration of the AT intervention was about 29 weeks (M = 29.23, SD = 30.5); however, the programs ranged in length from 5 to 96 weeks. The length of individual AT sessions ranged from 30 to 60 min. The water temperature was described in nine of sixteen studies, and ranged from 28.8 to 36°C, with most of the studies above 32°C. In the majority of the studies (n = 13) the frequency of AT varied from one to three days per week.

The most commonly-analyzed outcomes were from the physiological domain, described in eleven studies, and functional performance, reported in eight studies. The outcomes from the physiological domain often focused on respiratory function (n = 8) and motor function (n = 9). In two studies [36, 49] forced vital capacity in persons with DMD and LGMD did not change after AT intervention, while in other two [20, 53] a decrease was reported. The maximum inspiratory pressure increased in Caromano et al. [56] and Silva et al. [49], but decreased in Ramos et al. [52]. Maximum expiratory pressure decreased in Caromano et al. [56] and Ramos et al. [52] but was maintained in Silva et al. [49]. No change in peak expiratory flow was reported by Ramos et al. [52], but a decrease was observed in two other studies [49, 53].

In some studies related to AT interventions for individuals with myopathy, functional performance was measured by validated and reliable instruments. The EK score was analyzed in persons with DMD. Honório et al. [29] and Ferreira et al. [55] found EK to improve after long-term AT (89–104 weeks); however, no such change was reported by Silva et al. [49] after 10 sessions.

The quality of life was reported in three studies [20 , 36] and aquatic skills were evaluated in three. Ferreira et al. [55] applied the Likert Scale based evaluation on Halliwick Method, Israel [38] developed her own instrument, and DiBiasio et al. [36] described percentage system of aquatic skills progression.

Central nervous system diseases

The majority of the studies in this group were conducted on persons with Post-polio syndrome (PPS), making a total of 34 people (Table 4). Most of them were women; only one study [19] included men and women. The mean age of the participants was 49.1 years old. Two studies were conducted on individuals with Spinal Muscular Atrophy (SMA) [45, 51] (51 people, 54% men, age range 2.9–18 years) and one case study on person with Amyotrophic Lateral Sclerosis (ALS) [39].

Table 4

Study Characteristics – Research on Other NMDs

Reference	Study aim	Sample	Intervention program	Exercise parameters	Water temperature	Measuring instrument and outcome	Study design
Central Nervous System upper motor neuron and / or lower motor neuron disease
Albarello &Fiorina (2012) [34]	To verify the efficacy of AT in a PPS individual	PPS	AT (walk, relaxation, stretching, active movements for abdominal, lower and upper limbs exercises, scapular waist mobilization)	60 min, 3 days/week for 20 sessions	33.5– 34°C	Pre/post intervention	Case study
		n = 1				– Fatigue severity scale: ↓10 pts
		55 years (F)				– SF36: ↑23,2 pts
						– VAS – Pain scale (during activity): ↓5 pts
						– VAS – Pain scale (after rest): ↓3 pts
Cunha et al. (1996) [51]	To evaluate the potential benefits of AT as a supplementary rehabilitation method	SMA	AT (hydrotherapy and Halliwick method) + PT (kinesiotherapy, respiratory exercises and stretching)	AT (30 min for type II and 45 min for type III, 2 days/week, 2 years) + PT (1 day/week, 2 years)	30°C	Pre/post intervention	Quasi-experimental
		n = 50 Type II: 17(M), 13(F) Mean: 2.9 years Type III: 11(M), 9(F) Mean: 18 years				– Barthel Ladder: type II: ↑93%; type III: ↑100%
						– Degrees of deformities: ↑ in hips, knees and feet in all participants
						– Development of scoliosis: more pronounced in type II than type III
						– MMT (only in type III): no change or ↑ in all participants
						– Motor activities: type II – 5 participants acquire sitting, 4 acquire standing, 4 lost walking; type III – 1 participant acquire rolling, 1 acquire sitting, 3 acquire standing, 2 acquire walking
Johnson (1988) [39]	To describe solution to the lack of options for persons disabled by a chronic degenerative disease	ALS	AT (Water Exercise and Therapeutic Swim – WETSwim program – exercises for strength and flexibility, overall conditioning, recreation, and socialization)	45 min, 1 day/week for NR period	30° C	– Quality of life ↑	Case study
		n = 1 (M)				– Performance ↑
		62 years				– Swimming skills ↑
Martinez et al. (2015) [41]	To analyze the effect of the Halliwick method on physical fitness	PPS n = 1 (F) 35 years	AT (10 min warm-up; 70 min hydrokinesiotherapy program using Halliwick method – mental adjustment, release, vertical rotation, lateral rotation, combined rotation, flotation, balance, weathering turbulence, basic movement and fundamental movements; 10 min cool down)	90 min, 5 days/week for 4 months	NR	Pre/post intervention (Δ% percentage pre-post change)	Case study
						– Senior Fitness Test:
						Arm curl test: right arm ↑361.5 Δ%; left arm ↑360 Δ%
						Back scratch test: right shoulder ↑100 Δ%; left shoulder ↑125 Δ%
Medeiros et al. (2018) [43]	To investigate the effects of a AT on biochemical parameters, quality of life and functional physical capacity	PPS n = 2 (F) 53 years AT: n = 1 No PA: n = 1 57 years	AT (swimming program)	60 min, 2 days/week for 21 sessions	27°±1C	Pre/post intervention	Case study
						– Beck Anxiety Inventory: AT: ↓42%; no PA: ↑13%
						– BMI: AT:↓7%; no PA: ↑9%
						– FM: AT: ↓5%; no PA: ↑10%
						– Flexibility test: AT: ↑23%; no PA: no change
						– Hip circumference: AT: ↓3%; no PA: ↑5%
						– Muscle strength: AT: ↑10%; no PA: no change
						– SF36:
						Role limitations due to mental health: AT: ↑11%; no PA: no change
						General health: AT: ↑13%; no PA: no change
						– Waist circumference: AT: ↓4%; no PA: ↑1%
Salem et al. (2010) [45]	To describe an AT emphasizing functional movement to evaluate changes in motor function during land-based activities	SMA	AT (breathing exercises, flexibility, walking activities, exercised for last 5 min with the water between the mid-thigh level and the mid-leg level to allow transition of the activities to the land)	45 min, 2 days/week, 14 weeks	33°C	Pre/post intervention	Case study
		Type: III				– Gait speed: ↑0.25m
		n = 1 (F)				– Gross Motor Function Measure-88: ↑11%
		3 years				– MMT: ↑ lower limb muscles (exception of the right hamstring and bilateral dorsiflexor strength which remained the same)
						– Peabody Developmental Motor Scales-2^nd Edition: ↑8 pts
						– Single-limb support time:↑4.5% of the gait cycle
						– Stride length: ↑14cm
						– Stride time: ↓0.21s
Silva et al. (2010) [50]	To describe the effects of the AT in wheelchair patients with PPS, in view of trunk balance, pain, and consequent improvement of the activities of daily life	PPS	AT (active exercises focused on forward, lateral and back trunk muscles, stretching, relaxation)	45 min, 2 days/week for 24 weeks	33°C	Pre/post intervention	Case study
		n = 2 (F) Case 1:44 years (F) Case 2:49 years (F)				– Barthel Index: Case 1: ↑27.7%; Case 2: no change
						– BBS: Case 1: ↑21.5%; Case 2: ↑5.4%
						– MMT: Case 1: ↑ strength of trunk extensors; Case 2: ↑ strength of trunk extensors and rotators
						– VAS – pain scale: Case 1: ↓100%; Case 2: ↓38.6%
Willen et al. (2001) [19]	To evaluate the specific effects of general dynamic water exercise in individuals with PPS	PPS n = 28 EG: 7(M), 8(F) Mean: 51 years CG: 8(M), 5(F) Mean: 49 years	AT (aquatic exercises during standing, walking, bicycling, stretching)	40 min, 2 days/week, 8 months	+33°C	Pre/post intervention	Quasi-experimental
						– 30-meter walking – no change
						– BBS – no change
						– Muscle strength (dynamometer) – no change
						– Peak VO₂: EG: ↓ 1.2±4.0 mL/kg/min; CG: ↑1.0±3.4 mL/kg/min
						– Physical Activity Scale for the Elderly: EG: ↓4; CG: ↓12
						– VAS – pain: EG: ↓15 pts; CG: ↑4 pts
Peripheral Nervous System Neuropathies
Leite et al. (2010) [40]	To analyze the effects of AT associated to kinesiotherapy on land	ChMTD n = 1 (F) 49 years	AT (muscle strengthening, waist dissociation, balance exercises, jogging) + kinesiotherapy on land (activity circuit, squat on the parallel bars, kneeling to standing)	60 min, 2 days/week for 21 sessions	32– 34°C	Pre/post intervention	Case study
						– 6MWT: ↑15.50 m
						– BBS: ↑6%
						– Gait speed: ↑0.11 s
						– SF36:
						Physical function: ↑53.84%
						Role limitations due to physical health:↑50%
						Role limitations due to mental health: ↑4.16%
						Energy/fatigue: no change
						Emotional well-being: no change
						Social functioning: no change
						Pain: no change
						General health: ↑12.19%
						– TUG: ↑0.11 s
						– Up and down stairs:↓0.06s; ↓0.14 s
Mayer et al. (2020) [42]	To describe the effects of land-based and AT	Miller Fisher syndrome n = 1 (M) 57 years	AT (postural control, righting reactions, body awareness, gait training, lower extremity, general endurance, strength exercises) + PT (balance training, transfers and gait training, stability during standing)	AT (60 min, 2 days/week for 7 weeks) + PT (60 min, 2 days/week for 7 weeks)	NR	Pre/post intervention	Case study
– 6MWT:↑47.9 m
						– 10MWT: Self-Selected velocity ↑0.05 m/s; Fast Velocity ↑ 0.21 m/s
						– BBS: no change
						– SF36:
						Physical function: ↑5%
						Role limitations due to physical health: ↑25%
						Role limitations due to mental health: ↑100%
						Energy/fatigue ↑5%
						Emotional well-being: ↑40%
						Social functioning ↑12.5%
						Pain: no change
						General health ↓10%
						– TUG: ↓26.81 s
Zivi et al. (2017) [21]	To compare the effects of AT in the context of a land-based rehabilitative program and the land-based rehabilitation alone on balance and gait	Peripheral neuropathy n = 40 EG: 11(M),10(F) 66.3 (13.0) years CG: 8(M), 11(F) 71.8 (7.7) years	EG: 1. AT (relaxation and breath control; balance and posture control exercises; gait exercises) + 2. conventional one-to-one training with a physical therapist + 3. devices training with the supervision of a physical therapist (treadmill, cycloergometer, cyclette, stabilometric platform) + 4. Occupational Therapy CG: 1. conventional one-to-one training with a physical therapist + 2. devices training with the supervision of a physical therapist (treadmill, cycloergometer, cyclette, stabilometric platform)+3. Occupational Therapy	4 weeks EG: 1.60 min, 3 days/week + 2.60 min., 2 days/week +3.60 min, 6 days/week +4. 60 min, 5 days/week CG: 1. 60 min, 5 days/week +2.60 min, 6 days/week +3.60 min, 5 days/week	32°C	Pre/post intervention (delta)	RCT
						– BBS: EG: ↑11.1±4.9; CG: ↑11.4±6.9
						– Conley Scale: EG: ↓1.5±1.5; CG: ↓0.9±1.4 – Dynamic Gait Index: EG: ↑5.8±2.1; CG: ↑3.9±3.2 – Functional Ambulation Classification: EG: ↑0.9±0.6; CG: ↑1.4±0.7
						– Functional Independence Measure: EG: ↑25.8±8.2; CG: ↑ 26.1±11.5
						– Medical Research Council Scale score
						Hip flexors: EG: ↑0.5±0.5; CG: ↑0.9±0.5
						Hip extensors: EG: ↑0.8±0.4; CG: ↑0.8±0.5
						Ankle flexors EG: ↑0.7±0.7; CG: ↑0.9±0.7
						Ankle extensors EG: ↑0.6±0.7; CG: ↑0.9±0.8
						– Neuropathic Pain Scale: EG: ↓0.7±0.7; CG: ↓0.5±1.8
						– Overall Neuropathy Limitations Scale: EG: ↓0.2±1.2; CG: ↓0.8±0.9
Mixed NMD
Huguet-Rodríguez et al. (2020) [54]	To evaluate respiratory changes and functional outcomes in children with NMD attending an AT program	DMD (n = 2), congenital myopathy (n = 1), non-hereditary neuromuscular disease (n = 1), Steinert muscular dystrophy (n = 1), SMA (n = 4) ChMTD (n = 2)	AT (balance control, proprioception, double tasking, coordination, dissociation of shoulder and pelvic girdles, flexibility, maintenance of range of motion)	45– 60 min, 1 day/week for 10 weeks	NR	Pre/post intervention	Quasi-experimental
						6M/5F 8.36 (4.4) years
						– Forced expiratory volume in one second: ↑0.12 L
						– Inspired volume: significant ↑ in children > 11 years
						– O₂Sat: ↑ in children > 11 years^*
						– PEDI: care: ↑3.37 pts; mobility: ↑3 pts; social: ↑1.45 pts
						– Pediatric quality of life inventory:
						Disease: ↑0.99 pts; communication: ↑4.17 pts; family: ↑2.86 pts
						– Strength of the respiratory muscles:
						MEP ↑4.7 pts; MIP ↓8.7 pts
						– Volume of inhaled air: ↑18 pts
						– Water Orientation Test Alyn 1: ↑3.37 pts

↑ – increase of the parameter; ↓ – decrease of the parameter; 6MWT – 6-Minute Walk Test; 10MWT – 10 Meter Walk Test; ALS – Amyotrophic Lateral Sclerosis; AT – aquatic therapy; BBS- Berg Balance Scale; BMI – Body Mass Index; CG – control group; ChMTD – Charcot-Marie-Tooth Disease; DMD – Duchenne Muscular Dystrophy; EG – experimental group; F – female; FM – fat mass; M – male; MEP – Maximum Expiratory Pressure; MIP – Maximum Inspiratory Pressure; MMT- Manual Muscular Test; NMD – Neuromuscular Disorders; NR – not reported; PA – physical activity; Peak VO₂ – peak oxygen consumption; PEDI – Pediatric Evaluation of Disability Inventory; PPS – Post-polio syndrome; PT – physiotherapy; RCT – randomized clinical trial; SF-36 – Short Form (36) Health Survey; SMA – Spinal Muscular Atrophy; TUG – Timed Up & Go Test; VAS – Visual Analog Scale.

The duration of the single AT session ranged from 30 to 90 minutes, with the most common frequency being two days a week, as reported in five studies [19 , 51]. The duration of the intervention was diverse, from six weeks to two years in length, and the water temperature ranged between 27 and 34°C, with most of the studies above 30°C. Only two studies reported the level of immersion: one at the xiphoid process [51] and another between the waist and nipple line [46].

Two most commonly analyzed outcomes were related to functional performance and physiological domain, as described in six out of eight papers. An improvement in function and mobility was noticed in individuals with SMA and one individual with PPS, measured by the Barthel Index [50, 51]. Six studies evaluated muscle strength post AT intervention and showed improvement [41 , 51] or no change [19].

Pain was assessed in three studies with the Visual Analog Scale; all reported a decrease of pain post intervention [19 , 50]. Three studies evaluated quality of life. In all studies, post-intervention assessment was conducted on land, following AT. Only one study [39] claimed an improvement in swimming skills, but no exact test was performed in the water.

Peripheral neuropathy

Three studies were conducted on persons with peripheral nervous system diseases: Charcot-Marie-Tooth Disease [40], Miller Fisher Syndrome [42] and peripheral neuropathy [21] (Table 4). This group included a total of 42 participants, of whom 52% were female and whose age ranged from 49 to 71.8 years old.

AT interventions mainly focused on strength, balance and gait exercises and were combined with physical therapy on land. The duration of the AT session was 60 minutes, typically performed two or three times a week and the intervention lasted for four to ten weeks; the water temperature was 32–34°C. Only one study [42] reported the level of immersion during AT to the T10 level.

All of the studies focused mainly on measuring functional performance, such as with the Berg Balance Scale; the findings either showed improvement [21, 40] or no change [42]. The distance of walking measured with the 6-Minute Walk Test and the gait speed measured by the Timed Up & Go Test increased after the intervention [40, 42]. Two studies evaluated quality of life based on the Short Form-36 Health Survey [40, 42]; the results demonstrated improvement in physical function, physical, mental and general health. Only one study [21] used specific instruments for neuropathy: the Neuropathic Pain Scale and the Overall Neuropathy Limitations Scale.

DISCUSSION

The aim of this scoping review was to map the available research interventions on AT in persons with NMD. Twenty-eight publications were identified, and the review provides a full summary of the study designs, involved participants, the set-up of aquatic interventions and outcome measures utilized. Our findings indicate a considerable increase in the number of studies and a greater tendency to use validated instruments from 2010 onwards. The studies tend to focus on different aspects of the intervention outcomes such as functional performance, and the physiological and psychosocial aspects of the condition.

Most of the current research about AT in persons with NMD is based on case studies (68%), with only two identified studies being randomized controlled trials. Therefore, it is possible that some of the inconsistent results could be due to low quality of the studies rather than the effect of AT. In addition, it can be difficult to design studies in this area as many NMDs are classified as rare diseases [57] and persons with the same disease can display a wide diversity of function, thus resulting in the creation of a heterogenous group [58]. Furthermore, persons with different types of NMD may respond very differently to exercise [59]. The researchers note that a number of studies based on various interventions designed for NMD patients are of comparatively low quality [60]. Therefore future research should include larger, well-designed trials to determine efficacy and optimal AT treatment regimens.

NMD studies have often used small group. One reason for this is that clinicians did not prescribe exercise for this group in the past, as they believed physical activity might cause muscle damage and overuse. However, there is growing evidence suggesting that aerobic exercise may have positive effects on persons with NMD [60]. Due to its low-impact nature, the aquatic environment creates a movement opportunity with a low risk of injury and falling, which is ideal for people with weaker muscles. Immersion in the water also elicits physiological responses from the cardiac and respiratory system, including an increase in cardiac output and an increase in the work of breathing, resulting in changes in respiratory dynamics [18]. Our present review yielded ambiguous results regarding respiratory measures in muscular dystrophies; this again, could be a consequence of the noted differences in sample sizes and AT intervention parameters. None of the studies with persons with SMA and ALS investigated any changes in respiratory system, despite the severity of the respiratory progression in these diseases [14, 61]. Three studies used heart rate monitors to control the intensity of the sessions and only one study performed proper HR monitoring during every session to ensure training at a safe level [36]. Although immersion is not contraindicated for cardiopathies [62], such as individuals with Duchenne and Becker MD, these individuals should be screened prior to immersion to ensure appropriate safety precautions are implemented [6]. Nevertheless, none of the studies from our review reported screening before the intervention.

Aquatic therapy for general rehabilitation purposes and special populations is commonly performed in warm (above 30°C), shallow (chest-deep) water and may involve a variety of exercise modalities including aerobic, stretching/range of motion, resistance, and stability training [15]. Only five studies reported the implementation of specific methods for AT (Halliwick, WETSwim and Bad Ragaz) in the intervention programs for individuals with NMDs [39 , 55]. There are no recommendations on how to set fundamental parameters when scheduling aquatic sessions for persons with NMD, such as duration of the intervention, frequency, type of exercises, water temperature, level of immersion.

Our findings highlight considerable differences between studies in terms of duration of the intervention, which ranged from five weeks to two years. As NMDs are progressive diseases, longitudinal studies could detect developments or changes in patient populations at both the group and individual level [63]. The most common frequency of AT sessions was two times a week, which allows other therapies to be incorporated in the treatment.

Research on neurological diseases suggest that in persons with stroke [25] and Parkinson’s [64], AT may be the most effective approach to addressing activity limitation when it is complemented with land-based therapy. Our review showed that all studies conducted on persons with PNS, five studies with myopathy [20 , 55], and one with CNS [51] also incorporated aquatic and land therapy. Hind et al. [20] report lower motor function loss in an experimental group treated with aquatic and land therapy, compared to a group which received only land therapy.

Regarding the measured outcomes, most were therapeutically oriented, focusing on the functional performance and/or physiological domain, which is similar in patients with other neurologic conditions [65]. The majority of studies showed improvement or no change after AT intervention. It has to be noted that in the case of progressive diseases, a lack of decrease in outcomes is regarded as a positive therapeutic goal for maintaining function.

Some specific aspects were observed with regard to particular types of NMD. In individuals with myopathy, the physiological outcomes tended to concentrated on the loss of respiratory function, which is commonly observed in this condition. Our review identified some inconsistency in reported respiratory outcomes, which again, could be a consequence of differences in sample sizes and AT interventions. Moreover, Voos et al. [53] suggest that some persons with MD show respiratory function impairments according to spirometry, but good mouth and nose expiratory times during immersion; this may indicate that several compensatory strategies are available in the aquatic environment.

In the studies related to AT interventions for individuals with CNS diseases, the authors focused more on the effects of AT on muscular strength, activities of daily living and motor gross function. Interestingly, assessment of pain and quality of life was more addressed in PPS compared to persons with myopathy and/or PNS diseases. Three studies analyzing the implementation of AT in individuals with PNS reported improvement mainly in functional performance [21 , 42], but the focus was on ambulation. The authors report that AT had positive effects on gait speed, distance, risk of falling and body balance. Surprisingly, only five of the twenty-eight studies considered aquatic skills as AT outcomes. Ferreira et al. [55] observed an improvement of aquatic skills but a decrease of motor function on land, measured by EK, after two years. This might indicate that, perhaps due to the properties of the water environment, AT is able to activate preserved muscles that are not strong enough to overcome the force of the gravity, thus reinforcing the recommendation of AT.

Limitations

The results should be interpreted with caution, because in order to cover as broad a spectrum of the literature as possible, no quality inclusion criteria were used. It is possible that some relevant studies were not included in the chosen search strategy. However, the risk of selection bias was limited by the use of the detailed search terms and screening performed by two independent reviewers. This review did not include broad grey literature search and studies in other languages than English, Portuguese and Spanish.

CONCLUSIONS

Considerable heterogeneity exists between and within AT interventions for individuals with NMD. The fundamental parameters and procedures of therapy should be standardized to allow a better interpretation of the benefits. Although our mapping illustrates the diverse nature of the targeted outcomes of interventions, it has to be noted that fatigue, which is one of the most relevant symptoms of NMDs was rarely analyzed. Additionally, AT in CNS diseases needs more investigation concerning respiratory system assessment.

The comprehensive outline of available literature given in this scoping review could serve as a starting point for high-level clinical studies on the effects of AT on persons with NMD and improve the definition of parameters and protocols for its consensus. Future research based on NMD populations should focus on aspects related to optimal intervention; these should include the duration, frequency and type of program (aquatic, land-based or combined), the exercise parameters (water temperature and depth, water immersion level, starting intensity, time of exercise or number of repetitions, equipment used) and validated outcome measures (regarding body structures and functions, activities and participation).

Footnotes

ACKNOWLEDGMENTS

This work was supported by the Ministry of Science and Higher Education in the year 2021 under Research Group no 4 at Jozef Pilsudski University of Physical Education in Warsaw “Physical activity and sports for people with special needs”.

Declaration of interest

The authors have no conflicts of interest to report.

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Aquatic Therapy for Persons with Neuromuscular Diseases – A Scoping Review

Abstract

Background:

Objective:

Methods:

Results:

Conclusions:

Keywords

INTRODUCTION

MATERIALS AND METHODS

Searching for the evidence

Selecting the evidence

Extracting the evidence

RESULTS

Myopathy

Central nervous system diseases

Peripheral neuropathy

DISCUSSION

Limitations

CONCLUSIONS

Footnotes

ACKNOWLEDGMENTS

Declaration of interest

References