To determine differences in muscle activity amplitudes and variation of amplitudes when using different information and communication technologies (ICT).
Background:
Office workers use different ICT to perform tasks. Upper body musculoskeletal complaints are frequently reported by this occupational group. Increased muscle activity and insufficient variation are potential risk factors for musculoskeletal complaints.
Method:
Muscle activity of right and left upper trapezius and right wrist extensor muscle bundle (extensor carpi radialis longus and brevis) of 24 office workers (performing their usual tasks requiring different ICT at work and away from work) were measured continuously over 10 to 12 hours. Muscle activity variation was quantified using two indices, amplitude probability distribution function and exposure variation analysis.
Results:
There was a trend for electronics-based New ICT tasks to involve less electromyography (EMG) variation than paper-based Old ICT tasks. Performing Combined ICT tasks (i.e., using paper- and electronics-based ICT simultaneously) resulted in the highest muscle activity levels and least variation; however, these Combined ICT tasks were rarely performed. Tasks involving no ICT (Non-ICT) had the greatest muscle activity variation.
Conclusion:
Office workers in this study used various ICT during tasks at work and away from work. The high EMG amplitudes and low variation observed when using Combined ICT may present the greatest risk for musculoskeletal complaints, and use of Combined ICT by workers should be kept low in office work. Breaking up combined, New, and Old ICT tasks, for example, by interspersing highly variable Non-ICT tasks into office workers’ daily tasks, could increase overall muscle activity variation and reduce risk for musculoskeletal complaints.
AaråsA.FostervoldK. I.RoO.ThoresenM.LarsenS. (1997). Postural load during VDU work: A comparison between various work postures. Ergonomics, 40, 1255–1268.
2.
AaråsA.VeierodM.LarsenS.OrtengrenR.RoO. (1996). Reproducibility and stability of normalized EMG measurements on musculus trapezius. Ergonomics, 39, 171–185.
3.
ÅkessonI.HanssonG.-Å.BaloghI.MoritzU.SkerfvingS. (1997). Quantifying work load in neck, shoulders and wrists in female dentists. International Archives of Occupational and Environmental Health, 69, 461–474.
4.
AlkhajahT. A.ReevesM. M.EakinE. G.WinklerE. A. H.OwenN.HealyG. N. (2012). Sit–stand workstations: A pilot intervention to reduce office sitting time. American Journal of Preventive Medicine, 43, 298–303. doi:10.1016/j.amepre.2012.05.027
5.
AntonD.CookT.RosecranceJ.MerlinoL. (2003). Method for quantitatively assessing risk factors during variable noncyclic work. Scandinavian Journal of Work, Environment and Health, 29, 354–362.
6.
ArndtR. (1983). Working posture and musculoskeletal problems of video display terminal operators—Review and reappraisal. American Industrial Hygiene Association Journal, 44, 437–446. doi: 10.1080/15298668391405102
7.
ArvidssonI.HanssonG.-Å.MathiassenS.SkerfvingS. (2006). Changes in physical workload with implementation of mouse-based information technology in air traffic control. International Journal of Industrial Ergonomics, 36, 613–622.
BalciR.AghazadehF. (2003). The effect of work-rest schedules and type of task on the discomfort and performance of VDT users. Ergonomics, 46, 455–465.
10.
BaoS.MathiassenS.WinkelJ. (1995). Normalizing upper trapezius EMG amplitude: Comparison of different procedures. Journal of Electromyography and Kinesiology, 5, 251–257.
11.
BlandJ.AltmanD. (1995). Multiple significance tests: The Bonferroni method. British Medical Journal, 310, 170.
12.
BlangstedA.HansenK.JensenC. (2003). Muscle activity during computer-based office work in relation to self-reported job demands and gender. European Journal of Applied Physiology, 89, 352–358.
13.
CiccarelliM.StrakerL.MathiassenS.PollockC. (2011a). Diversity of occupations and technologies used by office workers at and away from work. Ergonomics, 54, 1017–1028. doi:10.1080/00140139.2011.609913
14.
CiccarelliM.StrakerL.MathiassenS.PollockC. (2011b). ITKids part II: Variation of postures and muscle activity in children using different information and communication technologies. Work, 38, 413–427. doi:10.3233/WOR20111168
15.
CookC.Burgess-LimerickR.PapaliaS. (2004). The effect of upper extremity support on upper extremity posture and muscle activity during keyboard use. Applied Ergonomics, 35, 285–292.
16.
DelisleA.LarivièreC.PlamondonA.ImbeauD. (2006). Comparison of three computer office workstations offering forearm support: Impact on upper limb posture and muscle activation. Ergonomics, 10, 139–160.
17.
FeiseR. (2002). Do multiple outcome measures require p-value adjustment?BMC Medical Research Methodology, 2(1), 8.
18.
FengY.GrootenW.WretenbergP.ArboreliusU. (1997). Effects of arm support on shoulder and arm muscle activity during sedentary work. Ergonomics, 40, 834–848.
19.
FernströmE.ÅborgC. (1999). Alterations in shoulder muscle activity due to changes in data entry organisation. International Journal of Industrial Ergonomics, 23, 231–240.
20.
FernströmE.EricsonM.MalkerH. (1994). Electromyographic activity during type writer and keyboard use. Ergonomics, 37, 477–484.
21.
Fjellman-WiklundA.GripH.AnderssonH.KarlssonJ.SundelinG. (2004). EMG trapezius muscle activity pattern in string players: Part II—Influences of basic body awareness therapy on the violin playing technique. International Journal of Industrial Ergonomics, 33, 357–367.
22.
ForsmanM.KadeforsR.ZhangQ.BirchL.PalmerudG. (1999). Motor-unit recruitment in the trapezius muscle during arm movements and in VDU precision work. International Journal of Industrial Ergonomics, 24, 619–630.
23.
GalinskyT.SwansonN.SauterS.HurrellJ.SchleiferL. (2000). A field study of supplementary rest breaks for data entry operators. Ergonomics, 43, 622–638.
24.
GrandjeanE. (1987). Ergonomics in computerized offices. London: Taylor and Francis.
25.
GreigA.StrakerL.BriggsA. (2005). Cervical erector spinae and upper trapezius muscle activity in children using different information technologies. Physiotherapy, 91, 119–126.
26.
HenningR.JacquesP.KisselG.SullivanA.Alter As-WebbS. (1997). Frequent short rest breaks from computer work: Effects on productivity and well-being at two field sites. Ergonomics, 40, 78–91.
27.
HeuvelS. G. v. d.LoozeM. P. d.HildebrandtV. H.ThéK. H. (2003). Effects of software programs stimulating regular breaks and exercises on work-related neck and upper-limb disorders. Scandinavian Journal of Work, Environment & Health, 29, 106–116.
28.
JacksonJ.MathiassenS.DempseyP. (2009). Methodological variance associated with normalization of occupational upper trapezius EMG using submaximal reference contractions. Journal of Electromyography and Kinesiology, 19, 416–427.
29.
JensenC.FinsenL.HansenK.ChristensenH. (1999). Upper trapezius muscle activity patterns during repetitive manual material handling and work with a computer mouse. Journal of Electromyography and Kinesiology, 9, 317–325.
30.
JensenC.NilsenK.HansenK.WestgaardR. (1993). Trapezius muscle load as a risk indicator for occupational shoulder-neck complaints. International Archives of Occupational and Environmental Health, 64, 415–423.
31.
JonssonB. (1982). Measurement and evaluation of local muscular strain in the shoulder during constrained work. Journal of Human Ergology, 11, 73–88.
32.
Juul-KristensenB.JensenC. (2005). Self-reported workplace related ergonomic conditions as prognostic factors for musculoskeletal symptoms: The “BIT” follow up study on office workers. Occupational and Environmental Medicine, 62, 188–194.
33.
KarlqvistL.HagbergM.SelinK. (1994). Variation in upper limb posture and movement during word processing with and without mouse use. Ergonomics, 37, 1261–1267.
34.
KarwowskiW.EbertsR.SalvendyG.NolandS. (1994). The effects of computer interface design on human postural dynamics. Ergonomics, 37, 703–724.
35.
KetolaR.ToivonenR.Viikari-JunturaE. (2001). Interobserver repeatability and validity of an observation method to assess physical loads imposed on the upper extremities. Ergonomics, 44, 119–131.
36.
LariviéreC.DelisleA.PlamondonA. (2005). The effect of sampling frequency on EMG measures of occupational mechanical exposure. Journal of Electromyography & Kinesiology, 15, 200–209.
37.
LaursenB.JensenB. R.GardeA. H.JorgensenA. H. (2002). Effect of mental and physical demands on muscular activity during the use of a computer mouse and a keyboard. Scandinavian Journal of Work, Environment and Health, 28, 215–221.
38.
LundbergU. (2002). Psychophysiology of work: Stress, gender, endocrine responses, and work-related upper extremity disorders. American Journal of Industrial Medicine, 41, 383–392.
39.
MaslenB.StrakerL. (2009). A comparison of posture and muscle activity means and variation amongst young children, older children and young adults whilst working with computers. Work, 32, 311–320.
40.
MathiassenS. (2006). Diversity and variation in biomechanical exposure: What is it, and why would we like to know?Applied Ergonomics, 37, 419–427.
41.
MathiassenS.BurdorfA.van der BeekA. (2002). Statistical power and measurement allocation in ergonomic intervention studies assessing upper trapezius EMG amplitude: A case study of assembly work. Journal of Electromyography and Kinesiology, 12, 45–57.
42.
MathiassenS.BurdorfA.van der BeekA.HanssonG.-Å. (2003). Efficient one-day sampling of mechanical job exposure data—A study based on upper trapezius activity in cleaners and office workers. American Industrial Hygiene Association Journal, 64, 196–211.
43.
MathiassenS.WinkelJ. (1991). Quantifying variation in physical load using exposure-vs-time data. Ergonomics, 34, 1455–1468.
44.
MathiassenS.WinkelJ.HäggG. (1995). Normalization of surface EMG amplitude from the upper trapezius muscle in ergonomic studies: A review. Journal of Electromyography and Kinesiology, 5, 197–226.
45.
McLeanL.TingleyM.RickardsJ.ScottR. (1997). Muscle fatigue measurement during prolonged computer terminal work with and without “microbreaks.”Paper presented at the Ergonomics at Work III: A National Approach, Winnipeg, Manitoba.
46.
McLeanL.TingleyM.ScottR.RickardsJ. (2001). Computer terminal work and the benefit of microbreaks. Applied Ergonomics, 32, 225–237.
47.
MöllerT.MathiassenS.FranzonH.KihlbergS. (2004). Job enlargement and mechanical exposure variability in cyclic assembly work. Ergonomics, 47, 19–40.
48.
MorkP.WestgaardR. (2005). Long-term electromyographic activity in upper trapezius and low back muscles of women with moderate physical activity. Journal of Applied Physiology, 99, 570–578.
49.
MorkP.WestgaardR. (2007). The influence of body posture, arm movement, and work stress on trapezius activity during computer work. European Journal of Applied Physiology, 101, 445–456.
50.
NordanderC.HanssonG.-Å.RylanderL.AsterlandP.ByströmJ.OhlssonK.. . .SkerfvingS. (2000). Muscular rest and gap frequency as EMG measures of physical exposure: The impact of work tasks and individual related factors. Ergonomics, 43, 1904–1919.
51.
PernegerT. (1998). What’s wrong with Bonferroni adjustments?British Medical Journal, 316, 1236–1238.
52.
RichterJ.MathiassenS.SlijperH.OverE.FrensM. (2009). Differences in muscle load between computer and non-computer work among office workers. Ergonomics, 52, 1540–1555.
53.
RobertsonM.CirielloV.GarabetA. (2013). Office ergonomics training and a sit-stand workstation: Effects on musculoskeletal and visual symptoms and performance of office workers. Applied Ergonomics, 44, 73–85.
54.
SeghersJ.JochemA.SpaepenA. (2003). Posture, muscle activity and muscle fatigue in prolonged VDT work at different screen height settings. Ergonomics, 46, 714–730.
55.
SrinivasanD.MathiassenS. E. (2012). Motor variability in occupational health and performance. Clinical Biomechanics, 27, 979–993. doi:http://dx.doi.org/10.1016/j.clinbiomech.2012.08.007
56.
StrakerL.AbbottR.HeidenM.MathiassenS.ToomingasA. (2013). Sit-stand desks in call centres: Associations of use and ergonomics awareness with sedentary behavior. Applied Ergonomics, 44(4), 517–522. doi:10.1016/j.apergo.2012.11.001
57.
StrakerL.LevineJ.CampbellA. (2009). The effects of walking and cycling computer workstations on keyboard and mouse performance. Human Factors, 51, 831–844. doi:10.1177/0018720810362079
58.
StrakerL.MaslenB.Burgess-LimerickR.PollockC. (2009). Children have less variable postures and muscle activities when using new electronic information technology compared with old paper based information technology. Journal of Electromyography and Kinesiology, 19, 132–143. doi: 10.1016/j.jelekin.2007.11.011
59.
StrakerL.MathiassenS. (2009). Increased physical work loads in modern work—A necessity for better health and performance?Ergonomics, 52, 1215–1225. doi:10.1080/00140130903039101
60.
SzetoG.StrakerL.O’SullivanP. (2005). A comparison of symptomatic and asymptomatic office workers performing monotonous keyboard work—1: Neck and shoulder muscle recruitment patterns. Manual Therapy, 10, 270–280.
61.
VeierstedK.WestgaardR.AndersenP. (1993). Electromyographic evaluation of muscular work pattern as a predictor of trapezius myalgia. Scandinavian Journal of Work Environment and Health, 19, 248–290.
62.
WærstedM.BjørklundR.WestgaardR. (1994). The effect of motivation on shoulder-muscle tension in attention-demanding tasks. Ergonomics, 37, 363–376.
63.
WærstedM.EkenT.WestgaardR. (1996). Activity of single motor units in attention-demanding tasks: Firing pattern in the human trapezius muscle. European Journal of Applied Physiology, 72, 323–329.
64.
WærstedM.WestgaardR. (1997). An experimental study of shoulder muscle activity and posture in a paper version versus a VDU version of a monotonous work task. International Journal of Industrial Ergonomics, 19, 175–185.
65.
WestgaardR. (2000). Work-related musculoskeletal complaints: Some ergonomics challenges upon the start of a new century. Applied Ergonomics, 31, 569–580.
66.
WestgaardR.VasseljenO.HolteK. (2001). Trapezius muscle activity as a risk indicator for shoulder and neck pain in female service workers with low biomechanical exposure. Ergonomics, 44, 339–353.
67.
WinkelJ.OxenburghM. (1990). Towards optimizing physical activity in VDT/office work. In SauterS.DainoffM.SmithM. (Eds.), Promoting health and productivity in the computerized office (pp. 94–117). London: Taylor & Francis.
