Cavanagh Peter, Rice Andrea, Glauberman Molly, Sudduth Amanda, Cherones Arien, Davis Shane, Lewis Michael, Hanson Andrea, Wilt Grier
Aerosp Med Hum Perform. 2017 Aug 1;88(8):730-736. doi: 10.3357/AMHP.4779.2017.
Treadmills have been employed as both a form of exercise and a countermeasure to prevent changes in the musculoskeletal system on almost all NASA missions and many Russian missions since the early Space Shuttle flights. It is possible that treadmills may also be part of exercise programs on future Mars missions and that they may be a component of exercise facilities in lunar or Martian habitats.
In order to determine if the ambient gravity on these destinations will provide osteogenic effects while performing exercise on a treadmill, ground reactions forces (GRFs) were measured on eight subjects (six women and two men) running at 6 mph during parabolic flight in Martian and lunar gravity conditions.
On average, stride length increased as gravity decreased. The first and second peaks of the GRFs decreased by 0.156 and 0.196 bodyweights, respectively, per 1/10 g change in ambient gravity.
Based on comparisons with previously measured GRF during loaded treadmill running on the International Space Station, we conclude that unloaded treadmill running under lunar and Martian conditions during exploration missions is not likely to be an osteo-protective exercise.Cavanagh P, Rice A, Glauberman M, Sudduth A, Cherones A, Davis S, Lewis M, Hanson A, Wilt G. Ground reaction forces during reduced gravity running in parabolic flight. Aerosp Med Hum Perform. 2017; 88(8):730-736.
自早期航天飞机飞行以来，跑步机几乎在所有美国国家航空航天局（NASA）任务和许多俄罗斯任务中都被用作一种锻炼形式和预防肌肉骨骼系统变化的对策。跑步机也有可能成为未来火星任务锻炼计划的一部分，并且可能是月球或火星栖息地锻炼设施的一个组成部分。
为了确定在这些目的地的环境重力下在跑步机上锻炼时是否会产生成骨作用，在火星和月球重力条件下的抛物线飞行过程中，对8名以每小时6英里速度跑步的受试者（6名女性和2名男性）测量了地面反作用力（GRF）。
平均而言，步幅随着重力的降低而增加。环境重力每变化1/10g，GRF的第一和第二峰值分别降低0.156和0.196体重。
基于与国际空间站上负重跑步机跑步期间先前测量的GRF进行比较，我们得出结论，在探索任务期间，在月球和火星条件下进行无负重跑步机跑步不太可能是一种保护骨骼的锻炼方式。卡瓦纳夫P、赖斯A、格劳伯曼M、萨德思A、切罗内斯A、戴维斯S、刘易斯M、汉森A、威尔特G。抛物线飞行中失重跑步时的地面反作用力。航空航天医学与人类表现。2017年；88(8):730 - 736。
