Effects of Armor Design and Marksmanship Posture on Performance,Postural Sway and Perceived Workload During a Military Rifle Marksmanship Task

Abstract

Objective

This study investigated the effects of mass and vertical center-of-mass position of combat items attached to a tactical vest, as well as marksmanship posture on rifle marksmanship performance, postural sway, and perceived workload during a simulated rifle shooting task.

Background

A tactical vest serves as a load carriage system in addition to providing body protection. Its design, particularly the mass and vertical position of attached combat items, may impact postural control during rifle shooting and thus marksmanship performance.

Method

Thirty-two participants performed a simulated rifle shooting task on a force plate with a tactical vest on. Three independent variables were considered: load mass (4 levels), vertical load center-of-mass position (4 levels), and marksmanship posture (2 levels). The dependent variables were: 6 rifle marksmanship performance measures, 7 postural sway measures, and a perceived workload measure.

Results

Heavier load mass significantly degraded rifle marksmanship performance, and increased postural sway and perceived workload. Marksmanship posture significantly affected rifle marksmanship performance and postural sway. The kneeling posture resulted in less postural sway and better marksmanship performance than the standing posture. Vertical load center-of-mass position affected only part of the marksmanship performance measures and did not affect the measures of postural sway and perceived workload.

Conclusion

Reducing combat item mass on tactical vests and enhancing soldier postural control ability would improve rifle marksmanship and soldier lethality.

Application

The study findings inform the development of future military tactical vests and rifle marksmanship training, highlighting the need for lightweight gear design and postural control training.

Keywords

motor control information processing biomechanics dual task multiple resource models mind–body interaction

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References

Anglin

K. M.

Novell

C. A.

Murphy

J. S.

Goodwin

G. A.

(2017). Identifying predictors of army marksmanship: A cognitive, affective, and psychomotor perspective. Proceedings of the Human Factors and Ergonomics Society - Annual Meeting, 61(1), 838–842. https://doi.org/10.1177/1541931213601683

Attwells

R. L.

Birrell

S. A.

Hooper

R. H.

Mansfield

N. J.

(2006). Influence of carrying heavy loads on soldiers’ posture, movements and gait. Ergonomics, 49(14), 1527–1537. https://doi.org/10.1080/00140130600757237

Bailey

J. B. A.

(2003). Field artillery and firepower. Field artillery and firepower. The Military Press Oxford. https://doi.org/10.4324/9780203392997

Ball

K. A.

Best

R. J.

Wrigley

T. V.

(2003). Body sway, aim point fluctuation and performance in rifle shooters: Inter- and intra-individual analysis. Journal of Sports Sciences, 21(7), 559–566. https://doi.org/10.1080/0264041031000101881

Birrell

S. A.

Hooper

R. H.

Haslam

R. A.

(2007). The effect of military load carriage on ground reaction forces. Gait & Posture, 26(4), 611–614. https://doi.org/10.1016/j.gaitpost.2006.12.008

Bossi

L. L. M.

Jones

M. L. H.

Kelly

Tack

D. W.

(2016). A preliminary investigation of the effect of protective clothing weight, bulk and stiffness on combat mobility course performance. Proceedings of the Human Factors and Ergonomics Society - Annual Meeting, 60(1), 702–706. https://doi.org/10.1177/1541931213601161

Brown

S. A. T.

McNamara

J. A.

Choi

H. J.

Mitchell

K. B.

(2016). Assessment of a marksmanship simulator as a tool for clothing and individual equipment evaluation. Proceedings of the Human Factors and Ergonomics Society - Annual Meeting, 60(1), 1424–1428. https://doi.org/10.1177/1541931213601327

Brown

S. A. T.

McNamara

J. A.

Mitchell

K. B.

(2017). Dynamic marksmanship: A novel methodology to evaluate the effects of clothing and individual equipment on mission performance. Proceedings of the Human Factors and Ergonomics Society, 61, 2020–2024. https://doi.org/10.1177/1541931213601982

Brown

S. A. T.

Mitchell

K. B.

(2017). Shooting stability: A critical component of marksmanship performance as measured through aim path and trigger control. Proceedings of the Human Factors and Ergonomics Society - Annual Meeting, 61(1), 1476–1480. https://doi.org/10.1177/1541931213601854

10.

Brown

S. A. T.

Mitchell

K. B.

(2019). Preliminary development of an integrated mobility, lethality, and survivability soldier performance testing platform. Advances in Intelligent Systems and Computing, 959, 153–164. https://doi.org/10.1007/978-3-030-20040-4_14

11.

Brown

S. A. T.

Villa

J. D.

Hancock

C. L.

Hasselquist

(2018). Stance and transition movement effects on marksmanship performance of expert shooters during a simulated multiple target engagement task. Proceedings of the Human Factors and Ergonomics Society - Annual Meeting, 62(1), 1444–1448. https://doi.org/10.1177/1541931218621328

12.

Carbone

P. D.

Carlton

S. D.

Stierli

Orr

R. M.

(2014). The impact of load carriage on the marksmanship of the tactical police officer: A pilot study. Journal of Australian Strength and Conditioning, 21(1), 50–57. https://www.researchgate.net/publication/265227430

13.

Carlton

S. D.

Orr

R. M.

(2014). The impact of occupational load carriage on carrier mobility: A critical review of the literature. International Journal of Occupational Safety and Ergonomics: JOSE, 20(1), 33–41. https://doi.org/10.1080/10803548.2014.11077025

14.

Charness

Gneezy

Kuhn

M. A.

(2012). Experimental methods: Between-subject and within-subject design. Journal of Economic Behavior & Organization, 81(1), 1–8. https://doi.org/10.1016/j.jebo.2011.08.009

15.

Choi

H. J.

Blake Mitchell

Garlie

McNamara

Hennessy

Carson

(2016). Effects of body Armor fit on marksmanship performance. Advances in Intelligent Systems and Computing, 489, 341–354. https://doi.org/10.1007/978-3-319-41694-6_35

16.

Chung

O’Neil

H. F.

Delacruz

G. C.

Bewley

W. L.

(2005). The role of anxiety on novices’ rifle marksmanship performance. Educational Assessment, 10(3), 257–275. https://doi.org/10.1207/s15326977ea1003_6

17.

Chung

G. K. W. K.

Delacruz

G. C.

De Vries

L. F.

Bewley

W. L.

Baker

E. L.

(2006). New directions in rifle marksmanship research. Military Psychology, 18(2), 161–179. https://doi.org/10.1207/s15327876mp1802_5

18.

Chung

G. K. W. K.

Nagashima

S. O.

Delacruz

G. C.

Lee

J. J.

Wainess

Baker

E. L.

(2011). Review of rifle marksmanship training research. (CRESST Report 783). University of California, National Center for Research on Evaluation, Standards, and Student Testing (CRESST). https://files.eric.ed.gov/fulltext/ED520427.pdf

19.

Corbeil

Simoneau

Rancourt

Tremblay

Teasdale

(2001). Increased risk for falling associated with obesity: Mathematical modeling of postural control. IEEE Transactions on Neural Systems and Rehabilitation Engineering: A Publication of the IEEE Engineering in Medicine and Biology Society, 9(2), 126–136. https://doi.org/10.1109/7333.928572

20.

Cornilleau-Pérès

Shabana

Droulez

Goh

J. C. H.

Lee

G. S. M.

Chew

P. T. K.

(2005). Measurement of the visual contribution to postural steadiness from the COP movement: Methodology and reliability. Gait & Posture, 22(2), 96–106. https://doi.org/10.1016/j.gaitpost.2004.07.009

21.

Davidson

S. P.

Cain

S. M.

Ojeda

Zaferiou

A. M.

Vitali

R. V.

Stirling

L. A.

Perkins

N. C.

(2021). Quantifying warfighter performance during a bounding rush (prone-sprinting-prone) maneuver. Applied Ergonomics, 94, 103382. https://doi.org/10.1016/j.apergo.2021.103382

22.

DiStefano

L. J.

Clark

M. A.

Padua

D. A.

(2009). Evidence supporting balance training in healthy individuals: A systemic review. The Journal of Strength & Conditioning Research, 23(9), 2718–2731. https://doi.org/10.1519/JSC.0b013e3181c1f7c5

23.

Dounskaia

Peterson

Bruhns

R. P.

(2018). Destabilization of the upright posture through elevation of the center of mass. Annals of Biomedical Engineering, 46(2), 318–323. https://doi.org/10.1007/s10439-017-1957-7

24.

Evans

R. K.

Scoville

C. R.

Ito

M. A.

Mello

R. P.

(2003). Upper body fatiguing exercise and shooting performance. Military Medicine, 168(6), 451–456. https://doi.org/10.1093/milmed/168.6.451

25.

Field

(2009). In Wright

D. B.

(Ed.), Discovering statistics using SPSS. Sage Publications.

26.

Fish

Scharre

(2018). The soldier’s heavy load. https://books.google.co.kr/books?id=OfLWvQEACAAJ

27.

Gage

W. H.

Winter

D. A.

Frank

J. S.

Adkin

A. L.

(2004). Kinematic and kinetic validity of the inverted pendulum model in quiet standing. Gait & Posture, 19(2), 124–132. https://doi.org/10.1016/S0966-6362(03)00037-7

28.

Gillingham

Keefe

A. A.

Keillor

Tikuisis

(2003). Effect of caffeine on target detection and rifle marksmanship. Ergonomics, 46(15), 1513–1530. https://doi.org/10.1080/0014013032000121606

29.

Gladyszewski

Gladyszewska

(2017). Fast Fourier transform analysis as a new tool for Olympic rifle coaches. Proceedings of the Institution of Mechanical Engineers - Part P: Journal of Sports Engineering and Technology, 231(1), 63–67. https://doi.org/10.1177/1754337116639482

30.

Greenwald

A. G.

(1976). Within-subjects designs: To use or not to use? Psychological Bulletin, 83(2), 314–320. https://doi.org/10.1037/0033-2909.83.2.314

31.

Han

Waddington

Adams

Anson

Liu

(2016). Assessing proprioception: A critical review of methods. Journal of Sport and Health Science, 5(1), 80–90. https://doi.org/10.1016/j.jshs.2014.10.004

32.

Harman

Frykman

Pandorf

Tharion

Mello

Obusek

Kirk

(1999). Physiological, biomechanical, and maximal performance comparisons of female soldiers carrying loads using prototype U.S. Marine Corps Modular Lightweight Load-carrying Equipment (MOLLE) with interceptor body armor and U.S. Army all-purpose lightweight Ind. DTIC Document. https://apps.dtic.mil/sti/pdfs/ADA365448.pdf

33.

Hart

S. G.

(2006). NASA-task load index (NASA-TLX); 20 years later. Proceedings of the Human Factors and Ergonomics Society - Annual Meeting, 50(9), 904–908. https://doi.org/10.1177/154193120605000909

34.

Hart

S. G.

Staveland

L. E.

(1988). Development of NASA-TLX (Task Load Index): Results of empirical and theoretical research. Advances in Psychology, 52, 139–183. https://doi.org/10.1016/S0166-4115(08)62386-9

35.

Head

Tenan

Tweedell

LaFiandra

Morelli

Wilson

Ortega

Helton

(2017). Mental fatigue influences subsequent marksmanship decision. Journal of Science and Medicine in Sport, 20, S126. https://doi.org/10.1016/j.jsams.2017.09.483

36.

Headquarters Department of the Army (HQDA) . (1984). Combat skills of the soldier (FM 21-75). https://www.bits.de/NRANEU/others/amd-us-archive/Fm21-75_15%2884%29.pdf

37.

Headquarters Department of the Army (HQDA) . (2009). Operator’s manual for modular lightweight load-carrying equipment (MOLLE) II (TM 10-8465-236-10). https://ciehub.info/ref/TM/10-8465-236-10_2009-11-02.pdf

38.

Headquarters Department of the Army (HQDA) . (2012). Operator’s manual for improved outer tactical vest GEN III (IOTV GEN III) (TM 10-8470-210-10). https://www.moore.army.mil/Tenant/LRC/content/pdf/IOTVGENIIITM10-8470-210-10.pdf

39.

Headquarters Department of the Army (HQDA) . (2016). Rifle and carbine (TC 3-22.9). https://irp.fas.org/doddir/army/tc3-22-9.pdf

40.

Headquarters Department of the Army (HQDA) . (2019). Training and qualification - individual weapons (TC 3-20.40). https://armypubs.army.mil/epubs/DR_pubs/DR_a/pdf/web/ARN19574_TC_3-20.40-Incl_C1_FINAL_WEB.pdf

41.

Headquarters Department of the Army (HQDA) . (2022). Foot marches (ATP 3-21.18). https://irp.fas.org/doddir/army/atp3-21-18.pdf

42.

Hoffman

Payne

V. G.

(1995). The effects of proprioceptive ankle disk training on healthy subjects. Journal of Orthopaedic & Sports Physical Therapy, 21(2), 90–93. https://doi.org/10.2519/jospt.1995.21.2.90

43.

James

D. R.

Dyer

J. L.

(2011). Rifle marksmanship diagnostic and training guide (research product 2011-07). https://apps.dtic.mil/sti/pdfs/ADA544533.pdf

44.

Johnson

R. F.

(2001). Statistical measures of marksmanship. USARIEM Technical Note (TN-01/2). https://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=ADA387108

45.

Karlsson

Lanshammar

(1997). Analysis of postural sway strategies using an inverted pendulum model and force plate data. Gait & Posture, 5(3), 198–203. https://doi.org/10.1016/S0966-6362(96)01082-X

46.

Kemnitz

C. P.

Johnson

R. F.

Merullo

D. J.

Rice

V. J.

(2001). Relation of rifle stock length and weight to military rifle marksmanship performance by men and women. Perceptual and Motor Skills, 93(2), 479–485. https://doi.org/10.2466/pms.2001.93.2.479

47.

Kovacs

E. J.

Birmingham

T. B.

Forwell

Litchfield

R. B.

(2004). Effect of training on postural control in figure skaters: A randomized controlled trial of neuromuscular versus basic off-ice training programs. Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine, 14(4), 215–224. https://doi.org/10.1097/00042752-200407000-00004

48.

Hyun

Lee

(2021). The role of death anxiety on marksmanship performance: A virtual reality simulator study. Ergonomics, 65(2), 219–232. https://doi.org/10.1080/00140139.2021.1965222

49.

Lafond

Corriveau

Hébert

Prince

(2004). Intrasession reliability of center of pressure measures of postural steadiness in healthy elderly people. Archives of Physical Medicine and Rehabilitation, 85(6), 896–901. https://doi.org/10.1016/j.apmr.2003.08.089

50.

LaGoy

A. D.

Johnson

Allison

K. F.

Flanagan

S. D.

Lovalekar

M. T.

Nagai

Connaboy

(2020). Compromised dynamic postural stability under increased load carriage magnitudes. Journal of Applied Biomechanics, 36(1), 27–32. https://doi.org/10.1123/JAB.2018-0473

51.

Lane

J. S.

(2017). The effect of loaded fatigue on loaded postural stability. University of Pittsburgh. https://d-scholarship.pitt.edu/33541/1/lanejs_etd2017.pdf

52.

Lang

Zhou

(2022). Relationships between postural balance, aiming technique and performance in elite rifle shooters. European Journal of Sport Science, 22(10), 1493–1498. https://doi.org/10.1080/17461391.2021.1971775

53.

Larsen

Netto

Aisbett

(2011). The effect of body armor on performance, thermal stress, and exertion: A critical review. Military Medicine, 176(11), 1265–1273. https://doi.org/10.7205/MILMED-D-10-00470

54.

Leanderson

Ekstam

Salomonsson

(1996). Taping of the ankle - the effect on postural sway during perturbation, before and after a training session. Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA, 4(1), 53–56. https://doi.org/10.1007/BF01565999

55.

Ledin

Ödkvist

L. M.

(1993). Effects of increased inertial load in dynamic and randomized perturbed posturography. Acta Oto-Laryngologica, 113(3), 249–252. https://doi.org/10.3109/00016489309135802

56.

S. S. W.

Chan

O. H. T.

T. Y.

Kam

L. H.

C. Y.

Chung

W. C.

Chow

D. H. K.

(2019). Effects of backpack and double pack loads on postural stability. Ergonomics, 62(4), 537–547. https://doi.org/10.1080/00140139.2018.1552764

57.

Lin

Seol

Nussbaum

M. A.

Madigan

M. L.

(2008). Reliability of COP-based postural sway measures and age-related differences. Gait & Posture, 28(2), 337–342. https://doi.org/10.1016/j.gaitpost.2008.01.005

58.

Loverro

K. L.

Brown

T. N.

Coyne

M. E.

Schiffman

J. M.

(2015). Use of body armor protection with fighting load impacts soldier performance and kinematics. Applied Ergonomics, 46 Pt A(Part A), 168–175. https://doi.org/10.1016/j.apergo.2014.07.015

59.

Majumdar

Pal

M. S.

Majumdar

(2010). Effects of military load carriage on kinematics of gait. Ergonomics, 53(6), 782–791. https://doi.org/10.1080/00140131003672015

60.

Mavor

M. P.

Gruevski

K. M.

Ross

G. B.

Akhavanfar

Clouthier

A. L.

Bossi

L. L. M.

Karakolis

Graham

R. B.

(2022). A data-driven framework for assessing soldier performance, health, and survivability. Applied Ergonomics, 104, 103809. https://doi.org/10.1016/j.apergo.2022.103809

61.

Michalska

Zając

Szydło

Gerasimuk

Słomka

K. J.

Juras

(2022). Biathletes present repeating patterns of postural control to maintain their balance while shooting. PLoS One, 17(5), e0267105–e0267112. https://doi.org/10.1371/journal.pone.0267105

62.

Mononen

Konttinen

Viitasalo

Era

(2007). Relationships between postural balance, rifle stability and shooting accuracy among novice rifle shooters. Scandinavian Journal of Medicine & Science in Sports, 17(2), 180–185. https://doi.org/10.1111/j.1600-0838.2006.00549.x

63.

Morasso

Cherif

Zenzeri

(2019). Quiet standing: The single inverted pendulum model is not so bad after all. PLoS One, 14(3), 02138700. https://doi.org/10.1371/journal.pone.0213870

64.

Moray

(1967). Where is capacity limited? A survey and a model. Acta Psychologica, 27(C), 84–92. https://doi.org/10.1016/0001-6918(67)90048-0

65.

Navon

Gopher

(1979). On the economy of the human-processing system. Psychological Review, 86(3), 214–255. https://doi.org/10.1037//0033-295x.86.3.214

66.

Nelson

A. G.

Kokkonen

Arnall

D. A.

(2012). Acute stretching increases postural stability in nonbalance trained individuals. The Journal of Strength & Conditioning Research, 26(11), 3095–3100. https://doi.org/10.1519/JSC.0b013e3182430185

67.

Norman

D. A.

Bobrow

D. G.

(1975). On data-limited and resource-limited processes. Cognitive Psychology, 7(1), 44–64. https://doi.org/10.1016/0010-0285(75)90004-3

68.

Noyes

J. M.

Bruneau

D. P. J.

(2007). A self-analysis of the NASA-TLX workload measure. Ergonomics, 50(4), 514–519. https://doi.org/10.1080/00140130701235232

69.

Ojie

O. O. D.

Saatchi

(2020). Demonstration of the effect of centre of mass height on postural sway using accelerometry for balance analysis. Technologies, 8(2), 20. https://doi.org/10.3390/technologies8020020

70.

Orr

R. M.

(2013). Soldier load carriage: A risk management approach, 364. https://espace.library.uq.edu.au/data/UQ_292953/s4043663_phd_finalthesis.pdf?Expires=1554919371&Signature=g6CwbweZEly∼YdTiJa39N0E∼BDTKQRRBqNC0knoT5-XGA5jidqgUOdiDOVvJe4CPKUM4frbmt8UF∼HQUN1np∼b4i∼jj5l-9∼n3RjXq3rZFWYMTwamGMjxC3nX-WobcXUeLmCnLli6KpIb3x3qCv6

71.

Orr

R. M.

Johnston

Coyle

Pope

(2015). Reported load carriage injuries of the Australian army soldier. Journal of Occupational Rehabilitation, 25(2), 316–322. https://doi.org/10.1007/s10926-014-9540-7

72.

Palmer

C. J.

(2012). Postures for precision: An ecological approach to marksmanship and the issue of warfighter load. University of Massachusetts Amherst. https://doi.org/10.7275/3527271

73.

Palmer

C. J.

Bigelow

Van Emmerik

R. E. A.

(2013). Defining soldier equipment trade space: Load effects on combat marksmanship and perception-action coupling. Ergonomics, 56(11), 1708–1721. https://doi.org/10.1080/00140139.2013.832805

74.

Palmer

C. J.

Van Emmerik

R. E. A.

(2020). Constraints of load and posture on coordination variability and marksmanship performance. Motor Control, 24(3), 435–456. https://doi.org/10.1123/MC.2019-0082

75.

Palmieri

R. M.

Ingersoll

C. D.

Stone

M. B.

Krause

B. A.

(2002). Center-of-pressure parameters used in the assessment of postural control. Journal of Sport Rehabilitation, 11(1), 51–66. https://doi.org/10.1123/jsr.11.1.51

76.

Pelin

B. I.

Bondoc-Ionescu

(2021). Shooting range improvement at junior biathletes using modern Technology. Series IX Sciences of Human Kinetics, 14(63)(1), 75–80. https://doi.org/10.31926/but.shk.2021.14.63.1.10

77.

Petrucci

M. N.

Horn

G. P.

Rosengren

K. S.

Hsiao-Wecksler

E. T.

(2016). Inaccuracy of affordance judgments for firefighters wearing personal protective equipment. Ecological Psychology, 28(2), 108–126. https://doi.org/10.1080/10407413.2016.1163987

78.

Plotskaya

Zakharova

(2015). Biathlon shooting training with SCATT-simulator: Accuracy shooting training of young biathletes. IcSPORTS 2015 - Proceedings of the 3rd International Congress on Sport Sciences Research and Technology Support, icSPORTS, Lisbon, Portugal, 15-17 November, 2015, 59–65. https://doi.org/10.5220/0005638400590065

79.

Program Executive Office Soldier . (2019). Integrated head Protection System (IHPS). https://www.peosoldier.army.mil/Equipment/Equipment-Portfolio/Project-Manager-Soldier-Survivability-Portfolio/Integrated-Head-Protection-System/

80.

Raymakers

J. A.

Samson

M. M.

Verhaar

H. J. J.

(2005). The assessment of body sway and the choice of the stability parameter(s). Gait & Posture, 21(1), 48–58. https://doi.org/10.1016/j.gaitpost.2003.11.006

81.

Reissland

Manzey

(2016). Serial or overlapping processing in multitasking as individual preference: Effects of stimulus preview on task switching and concurrent dual-task performance. Acta Psychologica, 168, 27–40. https://doi.org/10.1016/j.actpsy.2016.04.010

82.

Rosker

Markovic

Sarabon

(2011). Effects of vertical center of mass redistribution on body sway parameters during quiet standing. Gait & Posture, 33(3), 452–456. https://doi.org/10.1016/j.gaitpost.2010.12.023

83.

Rubio

Díaz

Martín

Puente

J. M.

(2004). Evaluation of subjective mental workload: A comparison of swat, NASA-TLX, and workload profile methods. Applied Psychology, 53(1), 61–86. https://doi.org/10.1111/j.1464-0597.2004.00161.x

84.

Sadowska

Krzepota

Klusiewicz

(2019). Postural balance and rifle stability in a standing shooting position after specific physical effort in biathletes. Journal of Sports Sciences, 37(16), 1892–1898. https://doi.org/10.1080/02640414.2019.1603136

85.

Savage-Knepshield

Martin

Lockett Ⅲ

Allender

(2016). In Harris

Stanton

Salas

(Eds.), Designing soldier systems. Routledge.

86.

Schiffman

J. M.

Bensel

C. K.

Hasselquist

Gregorczyk

K. N.

Piscitelle

(2006). Effects of carried weight on random motion and traditional measures of postural sway. Applied Ergonomics, 37(5), 607–614. https://doi.org/10.1016/j.apergo.2005.10.002

87.

Schiffman

J. M.

Bensel

C. K.

Hasselquist

Norton

Piscitelle

(2006). The effects of soldiers’ loads on postural sway. Transformational Science And Technology For The Current And Future Force, 42, 377–384. https://doi.org/10.1142/9789812772572_0049

88.

Schmid

Conforto

Bibbo

D’Alessio

(2004). Respiration and postural sway: Detection of phase synchronizations and interactions. Human Movement Science, 23(2), 105–119. https://doi.org/10.1016/j.humov.2004.06.001

89.

Shumway-Cook

Woollacott

M. H.

(2017). Motor control: Translating research into clinical practice (5th ed.). Wolters Kluwer.

90.

Singh

Park

Levy

M. S.

Jung

E. S.

(2009). The effects of obesity and standing time on postural sway during prolonged quiet standing. Ergonomics, 52(8), 977–986. https://doi.org/10.1080/00140130902777636

91.

Son

Hyun

Beck

Jung

Park

(2019). Effects of backpack weight on the performance of basic short-term/working memory tasks during flat-surface standing. Ergonomics, 62(4), 548–564. https://doi.org/10.1080/00140139.2019.1576924

92.

Stevenson

J. M.

Bryant

J. T.

Reid

S. A.

Pelot

R. P.

Morin

E. L.

Bossi

L. L.

(2004). Development and assessment of the Canadian personal load carriage system using objective biomechanical measures. Ergonomics, 47(12), 1255–1271. https://doi.org/10.1080/00140130410001699128

93.

Stoffregen

T. A.

Hove

Bardy

B. G.

Riley

Bonnet

C. T.

(2007). Postural stabilization of perceptual but not cognitive performance. Journal of Motor Behavior, 39(2), 126–138. https://doi.org/10.3200/JMBR.39.2.126-138

94.

Taglietti

Dela Bela

L. F.

Dias

J. M.

Pelegrinelli

A. R. M.

Nogueira

J. F.

Batista Júnior

J. P.

Carvalho

R. G. d. S.

McVeigh

J. G.

Facci

L. M.

Moura

F. A.

Cardoso

J. R.

(2017). Postural sway, balance confidence, and fear of falling in women with knee osteoarthritis in comparison to matched controls. PM & R: The Journal of Injury, Function, and Rehabilitation, 9(8), 774–780. https://doi.org/10.1016/j.pmrj.2016.11.003

95.

Talarico

M. K.

Morelli

Yang

Chaudhari

Onate

J. A.

(2023). Estimating marksmanship performance during walking while maintaining weapon aim. Applied Ergonomics, 113, 104096. https://doi.org/10.1016/j.apergo.2023.104096

96.

Taylor

N. A. S.

Peoples

G. E.

Petersen

S. R.

(2016). Load carriage, human performance, and employment standards. Applied Physiology Nutrition and Metabolism, 41(6 Suppl 2), 131–147. https://doi.org/10.1139/apnm-2015-0486

97.

Tharion

W. J.

Moore

R. J.

(1993). Effects of carbohydrate intake and load bearing exercise on rifle marksmanship performance. https://apps.dtic.mil/sti/tr/pdf/ADA262333.pdf

98.

Thomas

Pohl

M. B.

Shapiro

Keeler

Abel

M. G.

(2018). Effect of load carriage on tactical performance in special weapons and tactics operators. The Journal of Strength & Conditioning Research, 32(2), 554–564. https://doi.org/10.1519/JSC.0000000000002323

99.

Thompson

V. A.

Campbell

J. I. D.

(2004). A power struggle: Between-vs. within-subjects designs in deductive reasoning research. Psychologia, 47(4), 277–296. https://doi.org/10.2117/psysoc.2004.277

100.

Torres

Kim

(2019). The effects of caffeine on marksmanship accuracy and reaction time: A systematic review. Ergonomics, 62(8), 1023–1032. https://doi.org/10.1080/00140139.2019.1613572

101.

Tuthill

J. C.

Azim

(2018). Proprioception. Current Biology: CB, 28(5), R194–R203. https://doi.org/10.1016/j.cub.2018.01.064

102.

Walsh

G. S.

Low

D. C.

(2021). Military load carriage effects on the gait of military personnel: A systematic review. Applied Ergonomics, 93, 103376. https://doi.org/10.1016/j.apergo.2021.103376

103.

Wearing

S. C.

Hennig

E. M.

Byrne

N. M.

Steele

J. R.

Hills

A. P.

(2006). The biomechanics of restricted movement in adult obesity. Obesity Reviews: An Official Journal of the International Association for the Study of Obesity, 7(1), 13–24. https://doi.org/10.1111/j.1467-789X.2006.00215.x

104.

Wickens

C. D.

(2008). Multiple resources and mental workload. Human Factors, 50(3), 449–455. https://doi.org/10.1518/001872008X288394

105.

Winter

D. A.

(1995). Human balance and posture control during standing and walking. Gait & Posture, 3(4), 193–214. https://doi.org/10.1016/0966-6362(96)82849-9

106.

Woollacott

Shumway-Cook

(2002). Attention and the control of posture and gait: A review of an emerging area of research. Gait & Posture, 16(1), 1–14. https://doi.org/10.1016/S0966-6362(01)00156-4

107.

Zanevskyy

Korostylova

Mykhaylov

(2009). Specificity of shooting training with the optoelectronic target. Acta of Bioengineering and Biomechanics, 11(4), 63–70. https://citeseerx.ist.psu.edu/document?repid=rep1&type=pdf&doi=3fac0d32fbfbb038b53bce96265dd85b85965a3c

108.

Zanevskyy

Korostylova

Mykhaylov

(2014). Accuracy of SCATT optoelectronic shooting system. Proceedings of the Institution of Mechanical Engineers - Part P: Journal of Sports Engineering and Technology, 228(4), 270–275. https://doi.org/10.1177/1754337114536554

109.

Zech

Hübscher

Vogt

Banzer

Hänsel

Pfeifer

(2010). Balance training for neuromuscular control and performance enhancement: A systematic review. Journal of Athletic Training, 45(4), 392–403. https://doi.org/10.4085/1062-6050-45.4.392