Heise G, Shinohara M, Binks L
School of Sport and Exercise Science, University of Northern Colorado, Greeley, Colorado 80639, USA.
Int J Sports Med. 2008 Aug;29(8):688-91. doi: 10.1055/s-2007-989372. Epub 2007 Dec 18.
Relationships between an index of running economy (VO2 per distance) and the temporal electromyographic characteristics of leg muscles were quantified in female runners. Sixteen women performed a 30-min treadmill run at a speed designed to elicit a hard rating of perceived of exertion. Near the end of the run, oxygen uptake, video, and electromyographic data were collected simultaneously. Measures of muscle on-time durations, and on-time coactivation durations were calculated from the following muscles: gastrocnemius, vastus lateralis, rectus femoris, and biceps femoris. Nonparametric correlations between VO2 per distance and temporal electromyographic data were evaluated. Greater on-time duration of rectus femoris during stance, and greater on-time coactivation duration of rectus femoris-gastrocnemius during stance were significantly associated with more economical runners (i.e., lower VO2 per distance). The coactivation of biarticular leg muscles during stance is clearly linked to running economy and this control strategy may elicit greater elastic energy return.
研究了女性跑步者的跑步经济性指标（每距离的摄氧量）与腿部肌肉的肌电图时间特征之间的关系。16名女性以设定的速度在跑步机上进行了30分钟的跑步，该速度旨在引发较高的主观用力感觉评级。在跑步接近尾声时，同时收集了摄氧量、视频和肌电图数据。计算了以下肌肉的肌肉接通时间和接通时间共激活持续时间：腓肠肌、股外侧肌、股直肌和股二头肌。评估了每距离摄氧量与肌电图时间数据之间的非参数相关性。站立期间股直肌更长的接通时间，以及站立期间股直肌-腓肠肌更长的接通时间共激活持续时间，均与更经济的跑步者显著相关（即每距离更低的摄氧量）。站立期间双关节腿部肌肉的共激活明显与跑步经济性相关，这种控制策略可能会引发更大的弹性能量回返。
