The assessment of back muscle capacity using intermittent static contractions. Part I – Validity and reliability of electromyographic indices of fatigue

Larivière, Christian; Gagnon, Denis; Gravel, Denis; Arsenault, André

doi:10.1016/j.jelekin.2007.03.012

Cited by 37 publications

(39 citation statements)

References 73 publications

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“…influencing the MVC test previously performed; the absence of difference in EMG parameters between healthy and patients with CLBP and the smaller decrease in power frequency (reflecting lower fatigue) found in the latter group in some studies could be explained by the underestimation of the patients MVC resulting in a lower load level (Elfving et al, 2003;Lariviere et al, 2003a;Kramer et al, 2005). In order to avoid such a bias and to limit the influence of the anthropometric variables, Larivière et al recently proposed a promising assessment based on S-EMG monitoring during intermittent submaximal static contractions (6,5 seconds contraction / 1,5 second rest) performed in a non-commercial trunk dynamometer at a specific intensity (90 N.m) during 5 to 10 minutes (Lariviere et al, 2008a;Lariviere et al, 2009). Their results based on healthy subjects suggest that the EMG indices used in the study could predict absolute endurance as well as strength with the use of a single intermittent and time-limited endurance test (Lariviere et al, 2008b).…”

Section: Alternative To Maximum Effort Tests To Assess Trunk Muscle Pmentioning

confidence: 99%

Muscular Performance Assessment of Trunk Extensors: A Critical Appraisal of the Literature

Demoulin¹,

Grosdent²,

Smeets³

et al. 2012

Low Back Pain

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Section: Alternative To Maximum Effort Tests To Assess Trunk Muscle Pmentioning

confidence: 99%

Muscular Performance Assessment of Trunk Extensors: A Critical Appraisal of the Literature

Demoulin¹,

Grosdent²,

Smeets³

et al. 2012

Low Back Pain

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“…When the worker is bending forward their back in a long period of time, static contraction of muscles can occur particularly in the back. Due to static contraction, performance of the muscles may decrease and this condition can lead to discomfort and muscle fatigue [17].…”

Section: Current Trends In Ergonomicsmentioning

confidence: 99%

A Study on Muscle Fatigue Associated with Awkward Posture among Workers in Aerospace Industry

Seri

Hashim

Mohd

2013

AEF

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Abstract. In aerospace industry, many tasks required manufacturing workers to perform their works in awkward posture. Awkward posture is a practical working posture when joints are not in neutral position such as lifting heavy products, reaching materials, bending forward their back when doing jobs, and pushing or pulling excessive loads because those tasks require a stable position and large degree of freedom. If the workers perform the jobs continuously in awkward posture throughout the working hours, they may be experience muscle fatigue. The objective of this study is to measure the myoelectric level (µV) exerted by the right and left thoracolumbar fascia muscles while workers perform the lay-up process in aerospace industry. The myoelectric level in the muscles was measured using surface Electromyography (sEMG) measurement. Six production workers from aerospace industry participated as subjects. The muscle fatigue of the subjects was measured during beginning until finish of lay-up process. This measuring activity has been doing from Wednesday to Friday. Highest results of myoelectric level for right thoracolumbar fascia is when the workers make the lay-up process for ply seven until ply eleven. Different with the results of myoelectric level for left thoracolumbar fascia which is; three of the workers got highest result when they are making the lay-up process for ply seven until ply eleven, but the other three of the workers got highest result when they are making the lay-up process for ply twelve. Nevertheless, after averaging both of the results, a mean result for each worker shows the highest myoelectric level is when the workers make the lay-up process for ply seven until ply eleven. According to the mean, a percentage of worse tasks are projected. Based on this study, the authors concluded that muscle fatigue of the lay-up workers in aerospace industry was influenced by the work load, work activity and duration of awkward posture.

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“…In part I of this 2-part series (Larivière et al, 2008), a new EMG-based endurance test, namely the functional endurance test (FET), was proposed. Contrary to previous EMG-based tests involving one short-duration (about 30 s) sustained contraction at a high relative load [ > 70% of the maximal voluntary contraction (MVC)], the FET involves repeated intermittent contractions during a longer period of time (5-10 min) at a moderate absolute load or torque (90 N m).…”

Section: Introductionmentioning

confidence: 99%

The assessment of back muscle capacity using intermittent static contractions. Part II: Validity and reliability of biomechanical correlates of muscle fatigue

Larivière

Gravel

Gagnon

et al. 2008

Journal of Electromyography and Kinesiology

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The assessment of back muscle capacity using intermittent static contractions. Part I – Validity and reliability of electromyographic indices of fatigue

Cited by 37 publications

References 73 publications

Muscular Performance Assessment of Trunk Extensors: A Critical Appraisal of the Literature

Muscular Performance Assessment of Trunk Extensors: A Critical Appraisal of the Literature

A Study on Muscle Fatigue Associated with Awkward Posture among Workers in Aerospace Industry

The assessment of back muscle capacity using intermittent static contractions. Part II: Validity and reliability of biomechanical correlates of muscle fatigue

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