在持续的运动任务中，上肢带肌的肌肉协调性是否存在性别差异？
Are there sex differences in muscle coordination of the upper girdle during a sustained motor task?
作者信息
Cid Marina Machado, Oliveira Ana Beatriz, Januario Leticia Bergamin, Côté Julie N, de Fátima Carreira Moreira Roberta, Madeleine Pascal
机构信息
Laboratory of Clinical and Occupational Kinesiology (LACO), Department of Physical Therapy, Federal University of São Carlos, Rodovia Washington Luís, km 235 - SP-310, São Carlos, São Paulo, Brazil.
Laboratory of Clinical and Occupational Kinesiology (LACO), Department of Physical Therapy, Federal University of São Carlos, Rodovia Washington Luís, km 235 - SP-310, São Carlos, São Paulo, Brazil.
出版信息
J Electromyogr Kinesiol. 2019 Apr;45:1-10. doi: 10.1016/j.jelekin.2019.01.003. Epub 2019 Jan 16.
PURPOSE
The higher prevalence of work-related musculoskeletal disorders among women compared with men could be explained by sex-gender differences related to biological and physiological processes. The aim of this study was to evaluate sex differences in motor coordination during a sustained and repetitive motor task.
METHODS
Seventeen healthy females and 21 healthy males participated. The surface electromyography (sEMG) of the trapezius portions and serratus anterior were recorded. Root mean square (RMS) values were computed to assess the level of muscle activity. The standard deviation (SD) and coefficient of variation (CV) were computed as metrics of size of variability. The normalized mutual information (NMI) values were calculated as index of functional connectivity between muscles pairs.
RESULTS
Females had higher normalized RMS values for the upper trapezius (acromial fibers) and serratus anterior muscles compared with males. RMS decreased, SD and CV increased while NMI decreased for almost all muscle pairs over time.
CONCLUSION
The present work showed some signs of sex differences in muscle coordination of the shoulder girdle during a sustained motor task, performed with the upper limb positioned below of the shoulder level.
目的
与男性相比，女性中与工作相关的肌肉骨骼疾病患病率较高，这可能与生物和生理过程相关的性别差异有关。本研究的目的是评估在持续重复运动任务期间运动协调性的性别差异。
方法
17名健康女性和21名健康男性参与了研究。记录了斜方肌部分和前锯肌的表面肌电图（sEMG）。计算均方根（RMS）值以评估肌肉活动水平。计算标准差（SD）和变异系数（CV）作为变异性大小的指标。计算归一化互信息（NMI）值作为肌肉对之间功能连接的指标。
结果
与男性相比，女性上斜方肌（肩峰纤维）和前锯肌的归一化RMS值更高。随着时间的推移，几乎所有肌肉对的RMS下降，SD和CV增加，而NMI下降。
结论
目前的研究表明，在持续的运动任务中，当上肢位于肩部水平以下时，肩带肌肉协调性存在一些性别差异迹象。
Zotero 插件