Biomechanism of legs movement during stepping motion

本研究旨在阐明作为暂时性因素的跨步运动及其节奏特征。24名66- 90岁的健康男性和女性被招募为受试者。用高速摄像机记录15秒内最大努力的步进运动，并在坐姿下测量腿部力量。采用数字化的方法将人体位置坐标输入微机，分析频率、运动时间、位移、速度、功率等。为了更好地解释蹬踏运动，本文沿着计算了蹬踏运动性能与蹬踏运动参数之间的相关性，以及蹬踏阶段的周期时间（MT）、接触时间（CT）、腾空时间（AT）、腿上抬时间（MUT）和腿下降时间（LT）等临时参数的变化系数。结果表明：1）男性蹬踏运动的频率、动作时间、位移、速度、功率、下肢力量等参数均显著高于男性 ...更多信息 2）在踏步运动的各瞬时参数的节律性特征中，左右侧的MT相等。结果表明，运动频率与运动时间、运动频率与CT呈显著负相关，运动频率与运动速度、运动速度与CT呈正相关。4）跨步运动时频率的变异系数较小，CT和AT的变异系数中等（AT的变异系数大于CT）。MUT和LT的CV也较大。5）踏步运动分为原地踏步、轻跳提膝、强跳提膝3种类型，其中1型多见于女性，3型多见于男性。少

A study was conducted to clarify the stepping motion and its rhythms characteristics as temporary factor. Twenty-four healthy male and female 66-90year old were recruited as subjects. Stepping motion with maximum effort during 15 seconds was recorded by a high speed video camera, and the leg strength was measured in the sitting position. Coordinates of body position were fed into a microcomputer using a digitizing method, and the frequency, movement time, displacement, velocity, power etc were analized. In order to clarify the stepping motion, the correlation between the performance and parameter of stepping motion, was calculated, along with the coefficient-variation of temporary parameters such as lcycle time(MT), contact time(CT), aerial time(AT), leg moving up time (MUT)and leg lowering time (LT)in the aerial phase. The results may be summarized as follows:1 )Male' s parameters such as frequency, movement time, displacement, velocity, power, the leg strength in stepping motion were … More higher than those of females.2) Among rhythmic characteristics of temporary parameters in stepping motion, the right and left MT were equal. The CT was longer than the AT (Male was longer AT than the female), and the MUT in the aerial phase was longer than the LT.3) The results revealed a significant negative correlation between the frequency and the movement time, between the frequency and the CT, and a significant positive correlation was found between the frequency and velocity, between the velocity and the CT. However, there were no significant correlations between the frequency and the power, the leg strength.4) The coefficient-variation (CV) of the frequency in stepping motion was small, and the CV of CT and AT was mid-range(the CV of AT was larger than CT). The CV of MUT and LT were also greater. This suggested the instability of the aerial phase.5)Stepping motion was classified into three patterns, typel(stepping in place), type2(light hopping with lower knee lifting),type3(powerful hopping with higher knee lifting).Type 1 was frequent in female motion, while type3 was frequent in male motion. Less