| タイトル | Novel Analog For Muscle Deconditioning |
| 本文（外部サイト） | http://hdl.handle.net/2060/20110008690 |
| 著者（英） | Hackney, Kyle; Ploutz-Snyder, Lori; Ploutz-Snyder, Robert; Scott-Pandorf, Melissa; Bloomberg, Jacob; Ryder, Jeff; Buxton, Roxanne; Redd. Elizabeth; Fiedler, James |
| 著者所属（英） | NASA Johnson Space Center |
| 発行日 | 2011-04-10 |
| 言語 | eng |
| 内容記述 | Existing models (such as bed rest) of muscle deconditioning are cumbersome and expensive. We propose a new model utilizing a weighted suit to manipulate strength, power, or endurance (function) relative to body weight (BW). Methods: 20 subjects performed 7 occupational astronaut tasks while wearing a suit weighted with 0-120% of BW. Models of the full relationship between muscle function/BW and task completion time were developed using fractional polynomial regression and verified by the addition of pre-and postflightastronaut performance data for the same tasks. Splineregression was used to identify muscle function thresholds below which task performance was impaired. Results: Thresholds of performance decline were identified for each task. Seated egress & walk (most difficult task) showed thresholds of leg press (LP) isometric peak force/BW of 18 N/kg, LP power/BW of 18 W/kg, LP work/BW of 79 J/kg, isokineticknee extension (KE)/BW of 6 Nm/kg, and KE torque/BW of 1.9 Nm/kg.Conclusions: Laboratory manipulation of relative strength has promise as an appropriate analog for spaceflight-induced loss of muscle function, for predicting occupational task performance and establishing operationally relevant strength thresholds. |
| NASA分類 | Man/System Technology and Life Support |
| レポートNO | JSC-CN-23295 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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