Otto Annamaria, Emery Kim, Côté Julie N
Department of Kinesiology and Physical Education, McGill University, 475 Pine Avenue West, Montreal, Quebec H2W 1S4, Canada; Feil & Oberfeld/CRIR Research Center, Jewish Rehabilitation Hospital, 3205 Alton Goldbloom Place, Laval, Quebec H7V 1R2, Canada.
Department of Kinesiology and Physical Education, McGill University, 475 Pine Avenue West, Montreal, Quebec H2W 1S4, Canada; Feil & Oberfeld/CRIR Research Center, Jewish Rehabilitation Hospital, 3205 Alton Goldbloom Place, Laval, Quebec H7V 1R2, Canada.
J Electromyogr Kinesiol. 2018 Dec;43:140-147. doi: 10.1016/j.jelekin.2018.09.010. Epub 2018 Sep 25.
Fatigue is a risk factor for the development of work-related musculoskeletal disorders (WMSDs) of the neck/shoulder, and exertion is a state that connects the sensory/affective and physical aspects of fatigue. Relationships between ratings of perceived exertion (RPE) and electromyogram (EMG) signal characteristics have been identified. However, the sex-specific effects on these relationships are unclear and could be affected by personal factors such as skinfold thickness. 28 healthy young adults completed a fatiguing task with the arm held at shoulder height. Neck/shoulder EMG and RPE were collected at the end of each minute. Males showed stronger correlations between RPE with anterior deltoid (AD, r = 0.37) and upper trapezius (UT, r = 0.48) EMG, whereas females showed a weak relationship between RPE and UT EMG (r = 0.22), and no relationship with AD EMG. Significant correlations were observed between biceps EMG and skinfold thickness in both males and females. Findings suggest that neck/shoulder perceived exertion is strongly associated to the activity of shoulder mobilizers (anterior deltoid) in men, whereas in women, it is rather associated to the activity of shoulder stabilizers (upper trapezius), and to a lesser extent. It is possible that in turn, these sex differences affect fatigue adaptation strategies. Skinfold thickness may be an important variable to consider when studying sex-specific characteristics of muscle fatigue.
疲劳是颈部/肩部与工作相关的肌肉骨骼疾病（WMSDs）发生的一个风险因素，而用力是一种连接疲劳的感觉/情感和身体方面的状态。已确定了主观用力程度分级（RPE）与肌电图（EMG）信号特征之间的关系。然而，这些关系的性别特异性影响尚不清楚，并且可能受到诸如皮褶厚度等个人因素的影响。28名健康的年轻成年人将手臂保持在肩部高度完成一项疲劳任务。每分钟结束时收集颈部/肩部的肌电图和主观用力程度分级数据。男性的主观用力程度分级与三角肌前部（AD，r = 0.37）和斜方肌上部（UT，r = 0.48）肌电图之间的相关性更强，而女性的主观用力程度分级与斜方肌上部肌电图之间的关系较弱（r = 0.22），与三角肌前部肌电图无相关性。男性和女性的肱二头肌肌电图与皮褶厚度之间均观察到显著相关性。研究结果表明，男性颈部/肩部的主观用力程度与肩部活动肌（三角肌前部）的活动密切相关，而在女性中，它与肩部稳定肌（斜方肌上部）的活动相关性较小。反过来，这些性别差异可能会影响疲劳适应策略。在研究肌肉疲劳的性别特异性特征时，皮褶厚度可能是一个需要考虑的重要变量。
