Heise G D, Morgan D W, Hough H, Craib M
School of Kinesiology and Physical Education, University of Northern Colorado, Greeley, USA.
Int J Sports Med. 1996 Feb;17(2):128-33. doi: 10.1055/s-2007-972820.
Relationships between running economy (RE; submaximal VO(2) for a given running speed) and the temporal EMG characteristics of bi-articular leg muscles were quantified in a group of well-trained runners. Nine subjects completed three test sessions: a determination of maximal aerobic demand (VO(2)max); an accommodation session at the experimental speed of 4.13 m.s(-1) and a session during which EMG and RE data were collected simultaneously at the experimental speed of 4.13 m.s(-1) Measures of muscle onset, on-time durations, and on-time coactivation durations were calculated from the following muscles: rectus femoris, medial hamstrings, lateral hamstrings, and gastrocnemius. Nonparametric correlations between RE and EMG characteristics displayed both positive and negative relationships and exhibited a wide range of values. Two EMG measures were significantly correlated (r > 0.67) with RE. Earlier onset of rectus femoris during swing phase and a shorter duration of hamstring - gastrocnemius coactivation during swing were associated with more economical runners. Although not statistically significant, correlation coefficients calculated for measures of coactivation during stance and RE ranged from -0.42 to -0.65. This trend indicates that individuals who exhibited a greater amount of coactivation between bi-articular muscles during the stance phase of the running cycle tended to be more economical. These relationships suggest different activation patterns in bi-articular muscles between economical and uneconomical runners.
在一组训练有素的跑步者中，对跑步经济性（RE；给定跑步速度下的次最大摄氧量）与双关节腿部肌肉的肌电图（EMG）时间特征之间的关系进行了量化。九名受试者完成了三个测试环节：最大有氧需求（VO₂max）的测定；以4.13 m·s⁻¹的实验速度进行适应性训练环节；以及以4.13 m·s⁻¹的实验速度同时收集肌电图和跑步经济性数据的环节。从以下肌肉计算肌肉起始时间、持续时间和同时激活持续时间的测量值：股直肌、内侧腘绳肌、外侧腘绳肌和腓肠肌。跑步经济性与肌电图特征之间的非参数相关性呈现出正相关和负相关关系，且数值范围广泛。两项肌电图测量值与跑步经济性显著相关（r > 0.67）。摆动期股直肌更早起始以及摆动期腘绳肌 - 腓肠肌同时激活持续时间较短与更经济的跑步者相关。虽然在站立期同时激活测量值与跑步经济性之间计算出的相关系数没有统计学意义，但其范围为 -0.42至 -0.65。这一趋势表明，在跑步周期的站立期双关节肌肉之间表现出更大程度同时激活的个体往往更经济。这些关系表明经济型和非经济型跑步者在双关节肌肉中的激活模式不同。
