Adaptations to Neck/Shoulder Fatigue and Injuries

Côté, Julie N.

doi:10.1007/978-1-4939-1338-1_13

Cited by 43 publications

(36 citation statements)

References 122 publications

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“…Variability is a common feature of human movement that may play a role in the central organization of voluntary movement [ 35 ]. Previous studies have tried to distinguish between variability that has no effect on the quality of performance (“good” variability) and variability that has negative effect on the performance (“bad” variability) [ 36 ]. In fact, the presence of a level of variability in body movements is essential to make the movements more flexible and stable (good variability) [ 37 ].…”

Section: Discussionmentioning

confidence: 99%

Sex differences in the shoulder joint position sense acuity: a cross-sectional study

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Côté

Archambault

2015

BMC Musculoskelet Disord

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BackgroundWork-related musculoskeletal disorders (WMSD) is the most expensive form of work disability. Female sex has been considered as an individual risk factor for the development of WMSD, specifically in the neck and shoulder region. One of the factors that might contribute to the higher injury rate in women is possible differences in neuromuscular control. Accordingly the purpose of this study was to estimate the effect of sex on shoulder joint position sense acuity (as a part of shoulder neuromuscular control) in healthy individuals.MethodsTwenty-eight healthy participants, 14 females and 14 males were recruited for this study. To test position sense acuity, subjects were asked to flex their dominant shoulder to one of the three pre-defined angle ranges (low, mid and high-ranges) with eyes closed, hold their arm in that position for three seconds, go back to the starting position and then immediately replicate the same joint flexion angle, while the difference between the reproduced and original angle was taken as the measure of position sense error. The errors were measured using Vicon motion capture system. Subjects reproduced nine positions in total (3 ranges × 3 trials each).ResultsCalculation of absolute repositioning error (magnitude of error) showed no significant difference between men and women (p-value ≥ 0.05). However, the analysis of the direction of error (constant error) showed a significant difference between the sexes, as women tended to mostly overestimate the target, whereas men tended to both overestimate and underestimate the target (p-value ≤ 0.01, observed power = 0.79). The results also showed that men had a significantly more variable error, indicating more variability in their position sense, compared to women (p-value ≤ 0.05, observed power = 0.78).DiscussionDifferences observed in the constant JPS error suggest that men and women might use different neuromuscular control strategies in the upper limb. In addition, higher JPS variability observed in men might be one of the factors that could contribute to their lower rate of musculoskeletal disorders, compared to women.ConclusionsThe result of this study showed that shoulder position sense, as part of the neuromuscular control system, differs between men and women. This finding can help us better understand the reasons behind the higher rate of musculoskeletal disorders in women, especially in the working environments.

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Section: Discussionmentioning

confidence: 99%

Sex differences in the shoulder joint position sense acuity: a cross-sectional study

Vafadar

Côté

Archambault

2015

BMC Musculoskelet Disord

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“…Increased motor variability has been proposed to prolong performance and decrease risk of injury (Côté, 2014;Madeleine, 2010;Srinivasan & Mathiassen, 2012) and may therefore present similar benefits of decreasing the effects of the RPT on QST. This relationship lends support to the observation of significant correlations between UTR-QST and measures of motor variability despite UTR-QST itself not being significantly increased as a result of fatigue.…”

Section: Association Between Motor and Sensory Changesmentioning

confidence: 99%

“…Motor variability, defined as the intrinsic variability in actions controlled by the sensorimotor system (Madeleine, 2010;Mathiassen, Möller, & Forsman, 2003), has evolved into an important concept in the field of biomechanics because of the proposed benefit of variability toward decreasing the rate of fatigue development and the relative risk of injury (Côté, 2014;Madeleine, 2010;Srinivasan & Mathiassen, 2012). However, the mechanisms underlying changes in motor variability remain poorly understood (Cantu, Emery, & Côté, 2014;Fuller, Fung, & Côté, 2013;Huysmans, Hoozemans, van der Beek, de Looze, & van Dieen, 2008;Missenard, Mottet, & Perrey, 2008).…”

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confidence: 99%

Sex-Specific Links in Motor and Sensory Adaptations to Repetitive Motion–Induced Fatigue

2018

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The objectives of this study were to assess the sex-specific relationships between motor and sensory adaptations to repetitive arm motion-induced neck/shoulder fatigue, and to measure how additional sensory stimulation affects these adaptations. Twenty-three participants performed two sessions of a repetitive pointing task until scoring 8 on the Borg CR10 scale for neck/shoulder exertion or for a maximum of 45 min, with and without sensory stimulation (i.e., light touch) applied on the fatiguing shoulder. Just before reaching the task termination criteria, all participants showed changes in mean and variability of arm joint angles and experienced a fivefold increase in anterior deltoid sensory threshold in the stimulus-present condition. Women with the greatest increases in anterior deltoid sensory thresholds demonstrated the greatest increases in shoulder variability (r = .66), whereas men with the greatest increases in upper-trapezius sensory thresholds demonstrated the greatest changes in shoulder angle (r = −.60) and coordination (r = .65) variability. Thus, sensory stimulation had no influence on time to termination but affected how men and women differently adapted, suggesting sex differences in sensorimotor fatigue response mechanisms.

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“…However, studies that assessed sex differences in fatigue development during dynamic contractions, which are more closely related to muscle actions performed in daily activities, showed much more overlap in men’s and women’s endurance than with isometric contractions [ 14 ]. It has been hypothesized that motor adaptations to muscle fatigue could mitigate the MSD risk [ 7 , 15 ]. Indeed, many redundant structures (e.g., joints, muscles, motor units) compose the motor system and can be controlled in an infinite number of ways to successfully achieve a motor task, a phenomenon referred to as motor abundance [ 16 , 17 ].…”

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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Adaptations to Neck/Shoulder Fatigue and Injuries

Cited by 43 publications

References 122 publications

Sex differences in the shoulder joint position sense acuity: a cross-sectional study

Sex differences in the shoulder joint position sense acuity: a cross-sectional study

Sex-Specific Links in Motor and Sensory Adaptations to Repetitive Motion–Induced Fatigue

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

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