Dept of Exercise and Sport Science, University of North Carolina at Chapel Hill, USA.
J Sport Rehabil. 2009 Nov;18(4):553-63. doi: 10.1123/jsr.18.4.553.
Preventing noncontact ACL injuries has been a major focus of athletic trainers and researchers. One factor that may influence female noncontact ACL injury is the fluctuating concentrations of hormones in the body.
To determine whether muscle properties change across the menstrual cycle.
Repeated measures. Testing was performed within 3 d after the onset of menses and ovulation. Repeated-measures ANOVAs were used to determine changes in variables across the menstrual cycle, and Pearson correlations were used to determine relationships between variables.
8 women with normal menstrual cycles.
Active hamstring stiffness and hamstring extensibility.
Hamstring extensibility (P = .003) increased at the ovulation testing session but hamstring muscle stiffness (P = .66) did not.
The results indicate that hamstring muscle stiffness did not change across the menstrual cycle and hamstring extensibility increased at ovulation, when estrogen concentration increases.
预防非接触性 ACL 损伤一直是运动训练员和研究人员的主要关注点。可能影响女性非接触性 ACL 损伤的一个因素是体内激素浓度的波动。
确定肌肉特性是否随月经周期而变化。
重复测量。在月经初潮和排卵后 3 天内进行测试。采用重复测量方差分析来确定月经周期中变量的变化，采用皮尔逊相关来确定变量之间的关系。
8 名月经周期正常的女性。
主动腘绳肌硬度和腘绳肌伸展性。
在排卵测试时，腘绳肌伸展性（P =.003）增加，但腘绳肌硬度（P =.66）没有变化。
结果表明，在月经周期中，腘绳肌硬度没有变化，而在雌激素浓度增加的排卵时，腘绳肌伸展性增加。
