Chiu Shiu-Ling, Chang Chien-Chi, Chou Li-Shan
Department of Human Physiology, University of Oregon, Eugene, OR, USA.
Department of Industrial Engineering and Engineering Management, National Tsing Hua University, Hsinchu, Taiwan, ROC.
Gait Posture. 2015 Jan;41(1):316-8. doi: 10.1016/j.gaitpost.2014.09.015. Epub 2014 Sep 28.
This study compares the pattern and variability of inter-joint coordination between treadmill and overground walking. Gait analyses of five young adults were performed during preferred speed overground walking (GPS), preferred speed treadmill walking (TPS), and treadmill walking with overground preferred speed (TGS). Continuous relative phase (CRP), derived from the phase portraits of two adjacent joints, was used to examine the inter-joint coordination. Cross-correlation measures and root-mean-square (RMS) differences were used to compare CRP patterns of the GPS condition to those of TPS and TGS conditions respectively. The deviation phase (DP) was used to evaluate the variability of inter-joint coordination during the stance and swing phases over a gait cycle for each condition. The walking speed of TPS was significantly slower than those of GPS and TGS. For the hip-knee CRP pattern, the RMS differences between GPS and TPS were significantly greater than the RMS differences between GPS and TGS. No significant differences between conditions were detected for the cross-correlation measures of hip-knee and knee-ankle CRP patterns. During the stance phase, the hip-knee DP values of TGS were significantly smaller than that of GPS and the knee-ankle DP values of TGS were also significantly smaller than that of GPS and TPS. No significant differences were detected for all three conditions in the swing phase. The findings suggest that the treadmill imposes a systemic regulation on dynamic neuromuscular control during walking, which may need to be considered while interpreting treadmill-based analysis of training to overground walking.
本研究比较了跑步机行走和地面行走之间关节间协调的模式及变异性。对五名年轻成年人在地面偏好速度行走（GPS）、跑步机偏好速度行走（TPS）以及跑步机以地面偏好速度行走（TGS）过程中进行了步态分析。从两个相邻关节的相图得出的连续相对相位（CRP）用于检查关节间协调。互相关测量和均方根（RMS）差异分别用于比较GPS条件下与TPS和TGS条件下的CRP模式。偏差相位（DP）用于评估每种条件下一个步态周期中站立相和摆动相期间关节间协调的变异性。TPS的行走速度显著慢于GPS和TGS的行走速度。对于髋-膝CRP模式，GPS与TPS之间的RMS差异显著大于GPS与TGS之间的RMS差异。对于髋-膝和膝-踝CRP模式的互相关测量，各条件之间未检测到显著差异。在站立相期间，TGS的髋-膝DP值显著小于GPS的，且TGS的膝-踝DP值也显著小于GPS和TPS的。在摆动相期间，所有三种条件均未检测到显著差异。研究结果表明，跑步机在行走过程中对动态神经肌肉控制施加了系统性调节，在解释基于跑步机的训练分析以应用于地面行走时可能需要考虑这一点。
