科研之友
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摘要
. Introduction: Locomotor and some resistance exercises in space require a gravity replacement force in order to allow I g-like ground reaction forces to be generated. Currently bungee cords, or other loading devices, interface with the crew member through a harness with a waist belt and shoulder straps. Crew members often find the application of the required loads to be uncomfortable, particularly at the hips. Methods: An experimental harness was built that differed from previous in-flight designs by having a wider, moldable waist belt and contoured shoulder straps with additional padding. Eight subjects ran at 100% body weight (BW) loading for a total duration of 30 min per day on 12 days over a 3-week period in simulated 0-g conditions using horizontal suspension. A 100 mm Visual Analog Scale (VAS)(1) was used to assess harness-related and lower extremity discomfort at the end of each run. Results: The overall rating of harness discomfort decreased from 27 mm on the 100 mm scale on day I to 10 mm on day 12, with significant decreases recorded for the back and hip regions as well as the overall harness. Discussion: The experimental harness allows for repeated exposure to 30-minute bouts of 100% BW loaded simulated 0-g running with levels of discomfort less than 30 mm on a VAS scale of 0-100 mm. We believe that the use of such a harness during on-orbit exercise countermeasures may allow exercise to be performed at levels which are more effective in preventing bone and muscle loss.
- 出版日期2013-9
