Department of Neuroscience, University of Copenhagen, Copenhagen N, Denmark.
Department of Sport and Nutrition, University of Copenhagen, Copenhagen N, Denmark.
Physiol Rep. 2021 Oct;9(20):e15076. doi: 10.14814/phy2.15076.
Running economy (RE) at a given submaximal running velocity is defined as oxygen consumption per minute per kg body mass. We investigated RE in a group of 12 male elite runners of national class. In addition to RE at 14 and 18 km h we measured the maximal oxygen consumption (VO ) and anthropometric measures including the moment arm of the Achilles tendon (L ), shank and foot volumes, and muscular fascicle lengths. A 3-D biomechanical movement analysis of treadmill running was also conducted. RE was on average 47.8 and 62.3 ml O min kg at 14 and 18 km h . Maximal difference between the individual athletes was 21% at 18 km h . Mechanical work rate was significantly correlated with VO measured in L min at both running velocities. However, RE and relative work rate were not significantly correlated. L was significantly correlated with RE at 18 km h implying that a short moment arm is advantageous regarding RE. Neither foot volume nor shank volume were significantly correlated to RE. Relative muscle fascicle length of m. soleus was significantly correlated with RE at 18 km h . Whole body stiffness and leg stiffness were significantly correlated with L indicating that a short moment arm coincided with high stiffness. It is concluded that a short L is correlated with RE. Probably, a short L allows for storage of a larger amount of elastic energy in the tendon and influences the force-velocity relation toward a lower contraction velocity.
在给定的亚最大跑步速度下，跑步经济性（RE）定义为每分钟每公斤体重的耗氧量。我们调查了一组 12 名男性国家级精英跑步者的 RE。除了在 14 和 18 公里/小时的 RE 外，我们还测量了最大耗氧量（VO）和人体测量学指标，包括跟腱的力臂（L）、小腿和足部体积以及肌肉束长度。还进行了跑步机 3D 生物力学运动分析。RE 在 14 和 18 公里/小时时的平均值分别为 47.8 和 62.3 ml O min kg。个体运动员之间的最大差异为 18 公里/小时时的 21%。在两个跑步速度下，机械工作率与 VO 在 L min 时的测量值显著相关。然而，RE 和相对工作率没有显著相关。L 在 18 公里/小时时与 RE 显著相关，这表明短力臂有利于 RE。足部体积和小腿体积均与 RE 无显著相关性。m.soleus 的相对肌肉束长度与 18 公里/小时时的 RE 显著相关。全身刚度和腿部刚度与 L 显著相关，这表明短力臂与高刚度一致。结论是短 L 与 RE 相关。可能是短的 L 允许在跟腱中储存更多的弹性能量，并影响力-速度关系，使其朝着更低的收缩速度发展。
