Malcolm P, Segers V, Van Caekenberghe I, De Clercq D
Department of Movement and Sports Sciences, Ghent University, Watersportlaan 2, B-9000 Ghent, Belgium.
Gait Posture. 2009 Jan;29(1):6-10. doi: 10.1016/j.gaitpost.2008.05.016. Epub 2008 Jul 11.
The purpose of this study was to investigate the role of the tibialis anterior (TA) in the walk-to-run transition (WRT) by means of an experimental manipulation that allows increasing or decreasing muscular effort of the TA around heel contact. Eight subjects performed five WRTs on an accelerating treadmill wearing a powered ankle-foot exoskeleton. There was a trend towards a lower WRT-speed in the condition in which the TA was resisted (2.06+/-0.09 m s(-1)) than in the control condition (2.10+/-0.10 m s(-1)). This finding could not be extrapolated in the opposite direction, as there was no significant difference between the assist and control condition. The TA activation burst around heel contact showed a pattern that led to the hypothesis that the TA activation reaches a critical level at the fourth last heel contact before the WRT which triggers the WRT. The fact that the results comply with previous transition studies emphasises the role of the TA as a determinant of the WRT.
本研究的目的是通过一种实验操作来探究胫骨前肌（TA）在从步行到跑步转换（WRT）过程中的作用，该操作能够增加或减少足跟接触时TA的肌肉用力。八名受试者穿着动力踝足外骨骼在加速跑步机上进行了五次WRT。与对照条件（2.10±0.10 m s⁻¹）相比，TA受到阻力的条件下（2.06±0.09 m s⁻¹）WRT速度有降低的趋势。由于助力和对照条件之间没有显著差异，这一发现无法向相反方向外推。足跟接触时TA的激活爆发呈现出一种模式，由此得出一个假设，即TA的激活在WRT前倒数第四次足跟接触时达到临界水平，从而触发WRT。结果与先前的转换研究相符这一事实强调了TA作为WRT决定因素的作用。
