Ye Xin, Beck Travis W, Wages Nathan P, Carr Joshua C
The University of Mississippi, Department of Health, Exercise Science, and Recreation Management, University, MS 38677, USA.
J Musculoskelet Neuronal Interact. 2018 Mar 1;18(1):92-99.
To examine non-local muscle fatigue (NLMF) in both contralateral homologous and non-related heterogonous muscles for both sexes.
Ten men and nine women participated in this study. After the familiarization visit, subjects completed four separate randomly sequenced experimental visits, during which the fatiguing interventions (six sets of 30-second maximal isometric contractions) were performed on either their right elbow flexors or knee extensors. Before (Pre-) and after (Post-) the fatiguing interventions, the isometric strength and the corresponding surface electromyographic (EMG) amplitude were measured for the non-exercised left elbow flexors or knee extensors.
For the non-exercised elbow flexors, the isometric strength decreased for both sexes (sex combined mean±SE: Pre vs. Post=339.67±18.02 N vs. 314.41±16.37 N; p⟨0.001). For the non-exercised knee extensors, there is a time × sex interaction (p=0.025), showing a decreased isometric knee extension strength for men (Pre vs. Post =845.02±66.26 N vs. 817.39±67.64 N; p=0.019), but not for women.
The presence of NMLF can be affected by factors such as sex and muscle being tested. Women are less likely to demonstrate NLMF in lower body muscle groups.
研究两性对侧同源肌和非相关异源肌的非局部肌肉疲劳（NLMF）情况。
10名男性和9名女性参与了本研究。在熟悉实验流程后，受试者完成了4次单独的随机排序实验访视，在此期间，对其右侧肘屈肌或膝伸肌进行疲劳干预（6组30秒最大等长收缩）。在疲劳干预前后，测量未锻炼的左侧肘屈肌或膝伸肌的等长力量和相应的表面肌电图（EMG）幅度。
对于未锻炼的肘屈肌，两性的等长力量均下降（性别合并均值±标准误：干预前与干预后=339.67±18.02牛与314.41±16.37牛；p＜0.001）。对于未锻炼的膝伸肌，存在时间×性别的交互作用（p=0.025），表明男性的等长膝关节伸展力量下降（干预前与干预后=845.02±66.26牛与817.39±67.64牛；p=0.019），而女性则没有。
NMLF的存在可能受性别和所测试肌肉等因素影响。女性在下肢肌肉群中表现出NLMF的可能性较小。
