目的:明确模拟零重力环境下人体行走和跑步时的足底受力特征。方法:8名健康成年受试者分别在零重力跑台和正常重力跑台上进行3km/h、7km/h和10km/h的行走和跑步活动。利用鞋垫式足底压力测量系统对运动过程中的足底受力情况进行采集分析。结果:模拟零重力环境下步行的步态周期时间与正常重力环境并无显著差别。随着速度的增加,步态周期时间有明显的下降,不同速度之间差异明显(P<0.05)。但与地面正常重力环境比较,模拟零重力环境下的支撑相明显缩短(P<0.01)。足底压力结果显示,随着速度的增加,足底最大受力和垂直冲量均有显著的升高,不同速度之间相差明显(P<0.01),模拟零重力环境下明显小于正常重力环境(P<0.05)。时相对称性和垂直冲量比等平衡性指标显示模拟失重环境下人体的运动平衡功能明显低于正常重力环境(P<0.05),但不同速度之间差异不显著。结论:模拟零重力环境足底生物力学特征发生改变,可能是太空失重环境下体育训练后骨丢失和肌萎缩的原因之一。 Objective: To clearly simulate the stress characteristics of plantar walking and running under zero gravity environment. Methods: Eight healthy adult subjects walk and run at 3km / h, 7km / h and 10km / h on zero gravity treadmill and normal gravity treadmill respectively. Insole plantar pressure measurement system is used to collect and analyze plantar stress during exercise. Results: The walking gait cycle time simulated in zero-gravity environment has no significant difference with the normal gravity environment. With the increase of speed, the gait cycle time obviously decreased, the difference between different speeds was significant (P <0.05). However, compared with the normal gravimetric environment on the ground, the supporting phase under simulated zero-gravity environment was significantly shortened (P <0.01). The results of plantar pressure showed that with the increase of speed, the maximum stress and vertical impulse of plantar all increased significantly (P <0.01), and the simulated zero-gravity environment was significantly lower than that of normal gravity environment P <0.05). The balance indexes such as symmetry of time and the ratio of vertical impulse show that the body’s exercise balance function under simulated weightlessness environment is significantly lower than that under normal gravity environment (P <0.05), but the difference between different speed is not significant. CONCLUSION: The change of the plantar biomechanical features under simulated zero-gravity environment may be one of the causes of bone loss and muscle atrophy after physical training in space-weight-loss environment.