Adaptations to isolated shoulder fatigue during simulated repetitive work. Part I: Fatigue

Tse, Calvin T.F.; McDonald, Alison C.; Keir, Peter J.

doi:10.1016/j.jelekin.2015.07.003

Cited by 51 publications

(21 citation statements)

References 32 publications

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“…Electromyographic (EMG) signs of fatigue, such as a decreased median frequency and an increased amplitude [10], are particularly appealing as they could allow assessment of the relationships between sensory and motor changes during a fatiguing task on a muscle-by-muscle basis. For instance, Tse et al (2016) showed that EMG signs of muscle fatigue were present in only 4 (i.e. anterior deltoid, posterior deltoid, latissimus dorsi and serratus anterior) out of 14 shoulder muscles assessed during an arm elevation task [11], which illustrates the spatial sensitivity of the method.…”

Section: Introductionmentioning

confidence: 99%

Similar effects of fatigue induced by a repetitive pointing task on local and remote light touch and pain perception in men and women

Bouffard¹,

Weber²,

Pearsall³

et al. 2020

PLoS ONE

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Background Women involved in repetitive, fatiguing, jobs develop more neck and/or shoulder musculoskeletal disorders than men. Sex differences in the pain response to exercise could contribute to the higher prevalence of neck/shoulder musculoskeletal disorders in women. The objective of this study was to assess sex differences in pain sensitivity following a fatiguing upper limb task. Relationships between measures of fatigue and of the sensitivity to nociceptive and to non-nociceptive stimulations were also explored. Methods Thirty healthy adults (15 women) performed a fatiguing repetitive pointing task with their dominant arm. Upper limb electromyography was recorded from the dominant upper trapezius, anterior deltoid and bicep brachii and from the contralateral tibialis anterior. Before and immediately after the repetitive pointing task, pressure pain and light touch sensitivity thresholds were measured over the same muscles. Results Electromyographic signs of fatigue were observed only in the anterior deltoid and biceps brachii muscles. Pressure pain thresholds over both muscles increased slightly (effect size ≤ 0.34), but no changes occurred over the upper trapezius and the tibialis anterior. Light touch thresholds increased moderately to importantly after the repetitive pointing task over all four muscles (effect sizes = 0.58 to 0.87). No sex differences were observed in any sensory variable. Moreover, no or weak correlations (r = -0.27 to 0.39) were observed between electromyographical signs of fatigue, light touch threshold and pressure pain threshold variables. Conclusions We observed sex-independent effects of a repetitive upper limb task on the sensitivity to painful and to nonpainful stimuli. Moreover, the hypoalgesia induced by the repetitive pointing task was weak and localized, and did not directly correlate with the induced muscle fatigue. Results suggest that fatigue-related changes in the sensitivity to noxious and innocuous stimuli could not explain women’s greater prevalence of neck/shoulder musculoskeletal disorders.

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Section: Introductionmentioning

confidence: 99%

Similar effects of fatigue induced by a repetitive pointing task on local and remote light touch and pain perception in men and women

Bouffard¹,

Weber²,

Pearsall³

et al. 2020

PLoS ONE

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“…During multi-joint tasks, adaptations in muscle activity [ 21 – 23 ] and joint kinematics [ 24 – 27 ] were also observed. For instance, during a repetitive pointing task (RPT) fatiguing mostly shoulder muscles, observed changes in trunk posture have been thought to compensate for the decline in arm elevation angle to maintain the postural requirement of the task [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Sex differences in kinematic adaptations to muscle fatigue induced by repetitive upper limb movements

et al. 2018

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BackgroundMuscle fatigue induced by repetitive movements contributes to the development of musculoskeletal disorders. Men and women respond differently to muscle fatigue during isometric single-joint efforts, but sex differences during dynamic multi-joint tasks have not been clearly identified. Moreover, most studies comparing men and women during fatigue development assessed endurance time. However, none evaluated sex differences in kinematic adaptations to fatigue during multi-joint dynamic tasks. The objective of the study was to compare how men and women adapt their upper body kinematics during a fatiguing repetitive pointing task.MethodsForty men and 41 women performed repetitive pointing movements (one per second) between two targets while maintaining their elbow elevated at shoulder height. The task ended when participants rated a perceived level of fatigue of 8/10. Trunk, humerothoracic, and elbow angles were compared between the first and last 30 s of the experiment and between men and women. Linear positions of the index finger (distance from the target) and the elbow (arm elevation) as well as movement timing were documented as task performance measures.ResultsMen (7.4 ± 3.2 min) and women (8.3 ± 4.5 min) performed the repetitive pointing task for a similar duration. For both sex groups, trunk range of motion increased with fatigue while shoulder’s and elbow’s decreased. Moreover, participants modified their trunk posture to compensate for the decreased humerothoracic elevation. Movements at all joints also became more variable with fatigue. However, of the 24 joint angle variables assessed, only two Sex × Fatigue interactions were observed. Although average humerothoracic elevation angle decreased in both subgroups, this decrease was greater in men (standardized response mean [SRM] − 1.63) than in women (SRM − 1.44). Moreover, the movement-to-movement variability of humerothoracic elevation angle increased only in women (SRM 0.42).ConclusionDespite many similarities between men’s and women’s response to fatigue induced by repetitive pointing movements, some sex differences were observed. Those subtle differences may indicate that men’s shoulder muscles were more fatigued than women’s despite a similar level of perceived exertion. They may also indicate that men and women do not adapt the exact same way to a similar fatigue.Electronic supplementary materialThe online version of this article (10.1186/s13293-018-0175-9) contains supplementary material, which is available to authorized users.

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“…Others who studied the effects of an isometric fatiguing task for the wrist extensors and triceps demonstrated similar results, where movement accuracy was similar after fatigue, but with altered kinematics (Huffenus et al, 2006). Additionally, after a shoulder fatiguing protocol, kinematic adaptation was observed for several tasks, which was likely to maintain performance outcomes (Tse et al, 2016). Changes in performance may be attributed to signaldependent noise, which, in the context of the current study, would be considered the forces that are ineffectively contributing to the task (Missenard et al, 2008a).…”

Section: The Effects Of Performance Fatigability On Tracking Metricsmentioning

confidence: 79%

Dynamic Wrist Flexion and Extension Fatigue Induced via Submaximal Contractions Similarly Impairs Hand Tracking Accuracy in Young Adult Males and Females

Kumar

Forman

et al. 2020

Front. Sports Act. Living

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We evaluated the effects of muscle fatigue on hand-tracking performance in young adults. Differences were quantified between wrist flexion and extension fatigability, and between males and females. Participants were evaluated on their ability to trace a pattern using a 3-degrees-of-freedom robotic manipulandum before (baseline) and after (0, 1, 2, 4, 6, 8, and 10 mins) a submaximal-intensity fatigue protocol performed to exhaustion that isolated the wrist flexors or extensors on separate days. Tracking tasks were performed at all time points, while maximal voluntary contractions (MVCs) were performed at baseline, and 2, 6-, and 10-mins post-task termination. We evaluated movement smoothness (jerk ratio, JR), shape reproduction (figural error, FE), and target tracking accuracy (tracking error, TE). MVC force was significantly lower in females (p < 0.05), lower than baseline for all timepoints after task termination (p < 0.05), with no muscle group-dependent differences. JR did not return to baseline until 10-mins post-task termination (most affected), while FE returned at 4-mins post-task termination, and TE at 1-min post-task termination. Males tracked the target with significantly lower JR (p < 0.05), less TE (p < 0.05), and less FE (p < 0.05) than females. No muscle group-dependent changes in hand-tracking performance were observed. Based on this work, hand tracking accuracy is similarly impaired following repetitive submaximal dynamic wrist flexion or extension. The differences between male and female fatigability was independent of the changes in our tracking metrics.

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Adaptations to isolated shoulder fatigue during simulated repetitive work. Part I: Fatigue

Cited by 51 publications

References 32 publications

Similar effects of fatigue induced by a repetitive pointing task on local and remote light touch and pain perception in men and women

Similar effects of fatigue induced by a repetitive pointing task on local and remote light touch and pain perception in men and women

Sex differences in kinematic adaptations to muscle fatigue induced by repetitive upper limb movements

Dynamic Wrist Flexion and Extension Fatigue Induced via Submaximal Contractions Similarly Impairs Hand Tracking Accuracy in Young Adult Males and Females

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