Connick Mark J, Li Francois-Xavier
School of Human Movement Studies, University of Queensland, Brisbane, Australia.
School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, UK.
J Electromyogr Kinesiol. 2015 Feb;25(1):34-9. doi: 10.1016/j.jelekin.2014.08.009. Epub 2014 Sep 16.
Previous studies have employed relatively short cycling protocols to investigate the effect of cycling on muscle activation and kinematics in running. The aim of this study was to investigate the effect of 3h of cycling on stride time variability (STV), stride length, tibialis anterior (TA) activation, and lower limb range of motion (ROM) in a transition run. Eight triathletes completed a run-cycle-run protocol. Data were collected from a pre-cycle run and a transition run after 3h of cycling. STV, stride length and ROM were assessed using three-dimensional motion analysis, and TA activation was recorded using surface electromyography. Results showed that compared with the pre-cycle run triathletes exhibited increased STV (Cohen's d=0.95) and shorter strides (d=0.15) in the transition run (p<0.05). TA activation and ROM did not change. After 10min of transition running, ankle and hip ROM significantly increased (d=0.40 and 0.41 respectively) compared to the beginning of the transition run (p<0.05) but no other changes were observed. The results suggest that locomotor control and kinematics in a transition run are affected by prolonged cycling and stride time variability is potentially a novel method of evaluating the immediate effect of prolonged cycling on the locomotor control of running.
以往的研究采用相对较短的骑行方案来探究骑行对跑步时肌肉激活和运动学的影响。本研究的目的是调查3小时骑行对过渡跑中步幅时间变异性（STV）、步长、胫骨前肌（TA）激活以及下肢运动范围（ROM）的影响。八名铁人三项运动员完成了一项跑-骑-跑方案。在骑行3小时后的预骑行跑和过渡跑过程中收集数据。使用三维运动分析评估STV、步长和ROM，并使用表面肌电图记录TA激活情况。结果显示，与预骑行跑相比，铁人三项运动员在过渡跑中表现出STV增加（科恩d值=0.95）且步幅缩短（d=0.15）（p<0.05）。TA激活和ROM没有变化。在过渡跑10分钟后，与过渡跑开始时相比，踝关节和髋关节ROM显著增加（分别为d=0.40和0.41）（p<0.05），但未观察到其他变化。结果表明，过渡跑中的运动控制和运动学受长时间骑行的影响，步幅时间变异性可能是评估长时间骑行对跑步运动控制即时影响的一种新方法。
