Department of Human Movement Sciences, Faculty of Health, Medicine and Life Sciences, Maastricht University, Maastricht, Netherlands.
Gait Posture. 2011 Jul;34(3):300-6. doi: 10.1016/j.gaitpost.2011.05.013. Epub 2011 Jun 22.
Joint moments have been acknowledged as key factors in understanding gait abnormalities. Gait velocity is further known to affect joint moments and foot pressures. Keeping gait velocity constant is thus a strategy to cancel out the influence of different preferred gait speed between groups. But even if gait velocity is controlled, individuals can choose different stride length-stride frequency combinations to cope with an imposed gait velocity.
To understand the influence of stride frequency-stride length on joint moments and plantar pressures.
Twenty healthy young adults had to cross an 8m walkway with a walking speed of 1.3ms(-1). The wooden walkway was equipped with a force and a pressure platform. While walking speed was kept constant each participant walked with five different imposed stride lengths (SL): preferred (SL0); with a decrease of 10% (SL-10); with a decrease of 20% (SL-20); with an increase of 10% (SL+10) and with an increase of 20% (SF+20).
Ankle and knee joint moments significantly decreased with a decrease in SL. A significant (p<.05) lower peak pressure was achieved with a decreased SL under the heel, toes and midfoot.
DISCUSSION/CONCLUSION: The results showed that a change in stride lengths alters both, joint moments and foot pressures with clinically interesting indications. Redistribution of joint moments in the elderly for example might rather result from decreased SL than from age.
关节力矩已被认为是理解步态异常的关键因素。已知步行速度会影响关节力矩和足底压力。因此，保持步行速度恒定是消除不同组别之间不同首选步行速度影响的一种策略。但即使控制了步行速度，个体也可以选择不同的步长-步频组合来应对规定的步行速度。
了解步频-步长对关节力矩和足底压力的影响。
二十名健康的年轻人必须以 1.3ms(-1)的步行速度穿过 8 米的走道。木制走道配备了力和压力平台。当步行速度保持恒定时，每个参与者以五种不同的规定步长（SL）行走：首选（SL0）；减少 10%（SL-10）；减少 20%（SL-20）；增加 10%（SL+10）和增加 20%（SL+20）。
随着 SL 的减少，踝关节和膝关节力矩显著降低。在脚跟、脚趾和中足下，SL 减少导致足底压力显著（p<.05）降低。
讨论/结论：结果表明，步长的变化会改变关节力矩和足底压力，具有临床意义。例如，老年人的关节力矩分布的改变可能更多地是由于步长的减少，而不是年龄的原因。
