Effects of grip type and wrist posture on forearm EMG activity, endurance time and movement accuracy

Finneran, Aoife; O’Sullivan, Leonard

doi:10.1016/j.ergon.2012.11.012

Cited by 61 publications

(35 citation statements)

References 46 publications

(48 reference statements)

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“…Participants self selected their preferred working height on both platforms. It was necessary to control the pace of the simulated work as it is known to affect discomfort for the upper limb in simulated tasks (Finneran and O'Sullivan, 2013). As such, the participants in repetitive tasks were instructed to "perform the task at a pace they felt they could maintain for an eight hour day" (as per Finneran and O'Sullivan, 2010).…”

Section: Methodsmentioning

confidence: 99%

Shoulder muscle loading and task performance for overhead work on ladders versus Mobile Elevated Work Platforms

Phelan¹,

O’Sullivan²

2014

Applied Ergonomics

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A high incidence of Musculoskeletal Disorders (MSDs) has been reported in the construction sector. The use of ladders in the workplace has long been identified as a significant risk that can lead to workplace accidents. However, it is unclear if platform types have an effect on the physical risk factors for MSDs in overhead work. The aim of this study is to perform a pilot study on the effects of hand activity on both shoulder muscle loading and task performance while working on ladders versus Mobile Elevated Working Platforms (MEWPs). It is hypothesised that work on ladders would result in greater muscle loading demands, increased levels of discomfort and reduced performance due to the restrictions on postures that could be adopted. A field study (n=19) of experienced electricians on a construction site found that workers spent approximately 28% of their working time on ladders versus 6% on MEWPs. However, the durations of individual tasks were higher on MEWPs (153 seconds) than on ladders (73 seconds). Additionally, maximum levels of perceived discomfort (on a VAS 0-100) were reported for the shoulders (27), neck (23), and lower regions of the body (22). A simulated study (n= 12) found that task performance and discomfort were not significantly different between platform types (ladder vs. MEWP) when completing either of three tasks: cabling, assembly and drilling. However, platform and task had significant effects (p<0.05) on median and peak electromyograpic (EMG) activity of the anterior deltoid and upper trapezius. EMG amplitudes were higher for the deltoid than the upper trapezius. For the deltoid, the peak percentile amplitudes were, on average, higher for ladder work over MEWP work for the hand intensive cabling (32 vs. 27% Maximal Voluntary Exertion (MVE)) and the assembly task (19 vs. 6% MVE). Conversely, for drilling the peak percentile EMG amplitudes were marginally lower for ladder compared to the MEWP (3.9 vs. 5.1% MVE). The general implication was that working on the MEWP involved lower shoulder muscle loading for cabling and assembly task. A difference due to platform type was not present for drilling work.

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Section: Methodsmentioning

confidence: 99%

Shoulder muscle loading and task performance for overhead work on ladders versus Mobile Elevated Work Platforms

Phelan¹,

O’Sullivan²

2014

Applied Ergonomics

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“…Sensory capacity combined with agility are essential to the daily performance of the distal segment movements of the upper limb. Muscles in this region are of the utmost importance because they enable the practice of movements, such as the lateral pinch and the grip, therefore, a set of muscle actions is necessary such as the wrist extensor muscles activation associated with contraction of finger flexors [9][10][11] . Bawa et al 12 describe the synergy that exists between the wrist extensor muscle and finger flexor muscle.…”

Section: Introductionmentioning

confidence: 99%

Fadiga dos músculos extensores do punho diminui a força de preensão palmar

et al. 2017

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RESUMO O objetivo deste estudo foi avaliar os efeitos de um protocolo de fadiga dos músculos extensores de punho na força de preensão e da pinça lateral através da dinamometria e eletromiografia de superfície (EMG). Foram selecionados 40 indivíduos do sexo masculino, divididos em dois grupos: preensão ou pinça lateral. O protocolo de fadiga foi baseado no teste de 1 Repetição Máxima (1-RM), seguido da realização do movimento de extensão de punho repetidas vezes com carga de 75% da 1-RM. Os voluntários realizaram as tarefas de preensão ou pinça lateral associadas à dinamometria. A EMG foi realizada para ambos os grupos, analisando o comportamento, segundo o protocolo, pela frequência mediana (FM) do extensor radial do carpo (ERC), do extensor ulnar do carpo (EUC) e do flexor superficial dos dedos (FD). A dinamometria de preensão ou pinça lateral e a EMG foram realizadas antes e após o protocolo de fadiga para ambos os grupos. O protocolo de fadiga foi eficaz na diminuição da força de preensão palmar (43,5±3,85 kgf inicial e 36,50±5,1 kgf final) e da pinça lateral (10,26±1,01 kgf inicial e 8,54±0,86 kgf final), bem como na diminuição da FM, sugerindo uma condição de fadiga do EUC no grupo preensão. Os achados do presente estudo possibilitam relacionar a fadiga dos extensores de punho à diminuição de força em atividades funcionais, como a preensão, o que pode implicar em disfunções musculoesqueléticas do membro superior.

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“…Surface EMG electrodes (BIOPAC Systems, Inc., Santa Barbara, CA, USA) were placed on the lower arm muscles (extensor carpi radialis (ECR) and the flexor carpi radialis (FCR)). These muscles were chosen as they have shown to be activated during handgrip actions (Hoozemans & van Dieën, 2005;Finneran & O'Sullivan, 2013). The muscle sites were shaved and cleansed to reduce skin resistance prior to placement surface EMG electrodes.…”

Section: Muscular Responsesmentioning

confidence: 99%

The Impact of Cognitive Fatigue on Age-related Differences in Neuromuscular Function

Shortz

Mehta

2014

Proceedings of the Human Factors and Ergonomics Society Annual

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As the population of adults aged 65 and above is rapidly growing, it is crucial to identify physical and cognitive limitations pertaining to daily living. The aim of the study was to examine the impact of cognitive fatigue on age-related changes in neuromuscular fatigue and associated brain patterns of the prefrontal cortex.12 younger (20-35 years) and 11 older (65 and above years) females performed intermittent handgrip exercises at 30% maximum voluntary contraction (MVC) until voluntary exhaustion in the absence and presence of a prior 60-minute cognitively demanding task.Cognitive fatigue was successfully and comparably induced across both the younger and older groups (p<0.001). While neuromuscular fatigue outcomes (i.e., endurance time and rate of strength loss) and muscular responses were similar across groups (all p>0.100), greater decrements in cognitive fatiguerelated brain activation (p=0.053) were observed in older adults when compared to younger adults. Differences in brain activation suggest an age-related compensatory mechanism (i.e., the scaffolding theory of cognitive aging) of the frontal lobe to regulate the effect of cognitive fatigue to maintain neuromuscular performance.iii ACKNOWLEDGEMENTS

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Effects of grip type and wrist posture on forearm EMG activity, endurance time and movement accuracy

Cited by 61 publications

References 46 publications

Shoulder muscle loading and task performance for overhead work on ladders versus Mobile Elevated Work Platforms

Shoulder muscle loading and task performance for overhead work on ladders versus Mobile Elevated Work Platforms

Fadiga dos músculos extensores do punho diminui a força de preensão palmar

The Impact of Cognitive Fatigue on Age-related Differences in Neuromuscular Function

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