Effects of Velocity and Weight Support on Ground Reaction Forces and Metabolic Power During Running
Effects of Velocity and Weight Support on Ground Reaction Forces and Metabolic Power During Running
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DOI：
10.1123/jab.24.3.288
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发表时间：
2008-08-01
影响因子：
1.4
通讯作者：
Kram, Rodger
中科院分区：
文献类型：
--
作者：
Grabowski, Allena M.;Kram, Rodger
人体跑步的生物力学和代谢需求明显受到速度和体重的影响。随着跑步者增加速度，地面反作用力（GRF）增加，这可能会增加过度使用损伤的风险，并且需要更多的代谢功率来产生更大的肌肉力量产生率。负重跑步会减弱GRF，但比正常负重跑步需要更少的代谢能力。我们使用了一种最近开发的设备（G-trainer），该设备在跑步机跑步时使用下半身周围的正气压来支撑体重。我们的科学目标是量化跑步速度和体重支持对GRF和代谢能力的单独和综合影响。在获得这个基本数据集后，我们确定了速度和重量支持组合，导致不同的峰值GRF，但需要相同的代谢功率。速度和重量的理想组合可能通过衰减峰值GRF而降低生物力学风险，同时保持有氧和神经肌肉益处。事实上，我们发现了许多降低峰值垂直GRF的组合，但需要与正常体重下跑得较慢相同的代谢能力。这种在跑步过程中操纵速度和重量的方法可以证明是有效的训练和/或康复策略。
The biomechanical and metabolic demands of human running are distinctly affected by velocity and body weight. As runners increase velocity, ground reaction forces (GRF) increase, which may increase the risk of an overuse injury, and more metabolic power is required to produce greater rates of muscular force generation. Running with weight support attenuates GRFs, but demands less metabolic power than normal weight running. We used a recently developed device (G-trainer) that uses positive air pressure around the lower body to support body weight during treadmill running. Our scientific goal was to quantify the separate and combined effects of running velocity and weight support on GRFs and metabolic power. After obtaining this basic data set, we identified velocity and weight support combinations that resulted in different peak GRFs, yet demanded the same metabolic power. Ideal combinations of velocity and weight could potentially reduce biomechanical risks by attenuating peak GRFs while maintaining aerobic and neuromuscular benefits. Indeed, we found many combinations that decreased peak vertical GRFs yet demanded the same metabolic power as running slower at normal weight. This approach of manipulating velocity and weight during running may prove effective as a training and/or rehabilitation strategy.