Flynn T W, Canavan P K, Cavanagh P R, Chiang J H
Center for Locomotion Studies, Pennsylvania State University, University Park 16802, USA.
Phys Ther. 1997 Apr;77(4):410-6. doi: 10.1093/ptj/77.4.410.
Harness-supported treadmill ambulation has been advocated for patients to provide reduction in weight bearing to healing tissues and to reduce the energy cost of treadmill ambulation. The purposes of this technical report are to analyze the ability of one of these devices (Zuni Exercise System) to support a specific percentage of a subject's body weight during walking and running and to explore the relationship of unloading to pressure reduction in selected plantar surface regions of the foot.
Ten male volunteers with no known foot pathology participated.
In-shoe plantar pressure and vertical ground reaction forces (GRFs) were measured during walking and running at full body weight and at 20% of body weight supported.
Walking at a setting of 20% of body weight supported resulted in a reduction of the first and second vertical force peaks of 23.8% (SD = 7.3%) and 27.2% (SD = 4.1%), respectively. The total force-time integral during walking unloaded was 22.8% (SD = 3.3%). During running, the active vertical force peak and total force-time integral were reduced by 19.9% (SD = 6.0%) and 20.0% (SD = 3.3%), respectively, in the unloaded condition. Plantar pressures were reduced from 6.8% to 27.8% in the body weight-supported conditions. The reduction was variable across different regions of the foot.
The Zuni Exercise System appears to reduce the vertical component of the GRF during walking and running with 20% of body weight supported. Plantar pressures were reduced during body weight-supported conditions, but the reduction varied at different regions of the foot.
有人主张使用吊带辅助跑步机步行，以减轻愈合组织的负重，并降低跑步机步行的能量消耗。本技术报告的目的是分析其中一种设备（祖尼运动系统）在步行和跑步过程中支撑受试者特定百分比体重的能力，并探讨卸载与足部选定足底表面区域压力降低之间的关系。
招募了10名无已知足部病变的男性志愿者。
在全身体重以及支撑体重20%的情况下，测量步行和跑步过程中的鞋内足底压力和垂直地面反作用力（GRF）。
在支撑体重20%的设定下步行时，第一和第二垂直力峰值分别降低了23.8%（标准差=7.3%）和27.2%（标准差=4.1%）。卸载状态下步行期间的总力-时间积分降低了22.8%（标准差=3.3%）。在跑步过程中，卸载状态下主动垂直力峰值和总力-时间积分分别降低了19.9%（标准差=6.0%）和20.0%（标准差=3.3%）。在支撑体重的情况下，足底压力降低了6.8%至27.8%。足部不同区域的降低幅度各不相同。
祖尼运动系统在支撑体重20%的情况下步行和跑步时，似乎能降低GRF的垂直分量。在支撑体重的情况下足底压力降低，但足部不同区域的降低幅度有所不同。
