Effects of rotation frequency and task order on localised muscle fatigue and performance during repetitive static shoulder exertions

Horton, Leanna M.; Nussbaum, Maury A.; Agnew, Michael J.

doi:10.1080/00140139.2012.704406

Cited by 33 publications

(29 citation statements)

References 60 publications

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“…3). Previous studies investigating the effect of rotation frequency between lifting of 10% and 20% body weight (Horton et al, 2015), shoulder flexion and abduction (Raina and Dickerson, 2009), and static shoulder exertions at 15% and 30% MVC (Horton et al, 2012) on manifestations of muscle fatigue and perceived fatigue are in line with our findings. Because we clearly saw more development of perceived fatigue in the low compared to the high rotation frequency protocols, the two experimental tasks may not have been different enough in terms of muscle activation patterns, or the effects of the rotation schemes may not have been present yet within 1 h. We considered the EMG variability and its spatial centre of activity parameters because they could be influenced by manifestations of muscle fatigue.…”

Section: Tablesupporting

confidence: 82%

“…The EMG indicators of fatigue did not show differences with regard to task order. Thus, based on perceived fatigue, one could argue that task order may be crucial after all, although we cannot directly relate it to the conclusion of Raina andDickerson (2009) andHorton et al (2012) that starting with the more difficult or intense of two tasks results in higher levels of perceived fatigue. On the other hand, based on the EMG indicators of fatigue it seems that order of rotation may not be a very important factor (Keir et al, 2011).…”

Section: Task Ordermentioning

confidence: 97%

“…These studies rotated between tasks that differed considerably in the type of task and also the muscles activated during each task. Two studies that specifically rotated between tasks, which only differed in the load intensity during static shoulder exertions (Horton et al, 2012) and lifting (Horton et al, 2015), did not find changes in manifestations of muscle fatigue. Raina and Dickerson (2009) investigated the alternation between two fairly similar tasks, shoulder flexion and shoulder abduction, which have a different muscular demand; however, they did not find significant effects of rotation on manifestations of muscle fatigue or perceived exertion either.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Is rotating between static and dynamic work beneficial for our fatigue state?

Luger¹,

Bösch²,

Hoozemans

et al. 2016

Journal of Electromyography and Kinesiology

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a b s t r a c tShoulder disorders comprise a large part of work-related musculoskeletal disorders. Risk factors, such as repetitiveness and monotony, may cause muscle fatigue and be attenuated by task rotation. We investigated rotation between a dynamic box-lifting task and a relatively static pick-and-place task and aimed to determine whether (1) a high rotation frequency leads to less fatigue development than a low rotation frequency, and (2) a self-selected rotation frequency leads to less fatigue development than imposed rotation frequencies. Ten participants performed four one-hour rotation schedules: two low frequency rotation schedules rotating at 30 min, one high frequency rotation schedule rotating every sixth minute, and a self-selected rotation schedule. Borg, SOFI and electromyography of Trapezius and Deltoid subparts served as fatigue indicators. We found significant signs of fatigue for most schedules regarding the Borg and SOFI ratings and the M. Trapezius pars Descendens. Task rotation frequency had no significant effect on any of the outcome parameters, whereas the self-selected rotation schedule clearly resulted in less development of perceived fatigue than imposed schedules. In conclusion, we think that freedom of rotation has the greatest potential to attenuate potential development of musculoskeletal disorders and we require due caution with the use and interpretation of EMG indicators of fatigue.

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Section: Tablesupporting

confidence: 82%

Section: Task Ordermentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Is rotating between static and dynamic work beneficial for our fatigue state?

Luger¹,

Bösch²,

Hoozemans

et al. 2016

Journal of Electromyography and Kinesiology

View full text Add to dashboard Cite

show abstract

“…Our search identified 12 studies on tasks that were simulated in the laboratory (Horton et al, 2012;Gooyers and Stevenson, 2012;Bosch et al, 2011;Keir et al, 2011;Wells et al, 2010;Raina and Dickerson, 2009;Iridiastadi and Nussbaum, 2006;Balci and Aghazadeh, 2004;Gerard et al, 2002;McLean et al, 2001;Mathiassen and Winkel, 1996;Sundelin, 1993) and 2 studies on real-life occupational settings (Bosch et al, 2007;Christensen et al, 2000). In general, the laboratory studies had small-sized sample groups.…”

Section: Resultsmentioning

confidence: 98%

The influence of task design on upper limb muscles fatigue during low-load repetitive work: A systematic review

Baptista

Monteiro

et al. 2016

International Journal of Industrial Ergonomics

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Ergonomic interventions such as increased scheduled breaks or job rotation have been proposed to reduce upper limb muscle fatigue in repetitive low-load work. This review was performed to summarize and analyze the studies investigating the effect of job rotation and work-rest schemes, as well as, work pace, cycle time and duty cycle, on upper limb muscle fatigue. The effects of these work organization factors on subjective fatigue or discomfort were also analyzed. This review was based on relevant articles published in PubMed, Scopus and Web of Science. The studies included in this review were performed in humans and assessed muscle fatigue in upper limbs. 14 articles were included in the systematic review. Few studies were performed in a real work environment and the most common methods used to assess muscle fatigue were surface electromyography (EMG). No consistent results were found related to the effects of job rotation on muscle activity and subjective measurements of fatigue. Rest breaks had some positive effects, particularly in perceived discomfort. The increase in work pace reveals a higher muscular load in specific muscles. The duration of experiments and characteristics of participants appear to be the factors that most have influenced the results. Future research should be focused on the improvement of the experimental protocols and instrumentation, in order to the outcomes represent adequately the actual working conditions. Relevance to industryIntroducing more physical workload variation in low-load repetitive work is considered an effective ergonomic intervention against muscle fatigue and musculoskeletal disorders in industry. Results will be useful to identify the need of future research, which will eventually lead to the adoption of best industrial work practices according to the workers capabilities.

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“…It is based on the assumption of reducing physical stress of operators by varying the parts of the body that are stressed. However, in practice, it can have the opposite effect and even be harmful to worker health (Comper and Padula, 2014;Luger et al, 2014;Horton et al, 2012;Keir et al, 2011). The protocol put in place in this study does not make it possible to validate this proposal.…”

Section: Anovamentioning

confidence: 82%

A better way of fitting clips? A comparative study with respect to physical workload

2015

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The clip fitting task is a frequently encountered assembly operation in the car industry. It can cause upper limb pain. During task laboratory simulations, upper limb muscular activity and external force were compared for 4 clip fitting methods: with the bare hand, with an unpowered tool commonly used at a company and with unpowered and powered prototype tools. None of the 4 fitting methods studied induced a lower overall workload than the other three. Muscle activity was lower at the dominant limb when using the unpowered tools and at the non-dominant limb with the bare hand or with the powered tool. Fitting clips with the bare hand required a higher external force than fitting with the three tools. Evaluation of physical workload was different depending on whether external force or muscle activity results were considered. Measuring external force only, as recommended in several standards, is insufficient for evaluating physical workload.

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Effects of rotation frequency and task order on localised muscle fatigue and performance during repetitive static shoulder exertions

Cited by 33 publications

References 60 publications

Is rotating between static and dynamic work beneficial for our fatigue state?

Is rotating between static and dynamic work beneficial for our fatigue state?

The influence of task design on upper limb muscles fatigue during low-load repetitive work: A systematic review

A better way of fitting clips? A comparative study with respect to physical workload

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