Effects of aging and arm swing on the metabolic cost of stability in human walking.
Effects of aging and arm swing on the metabolic cost of stability in human walking.
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DOI：
10.1016/j.jbiomech.2008.06.039
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发表时间：
2008-12-05
影响因子：
2.4
通讯作者：
Farley, Claire T.
中科院分区：
文献类型：
--
作者：
Ortega, Justus D.;Fehlman, Leslie A.;Farley, Claire T.
为了深入了解步行能量学的机械决定因素，我们研究了衰老和手臂摆动对稳定代谢成本的影响。我们测试了两个假设：1）老年人在行走过程中比年轻人消耗更多的代谢能量，因为他们消耗更多的代谢能量用于侧向稳定，以及2）手臂摆动减少了年轻人和老年人在行走过程中稳定的代谢成本。为了验证这些假设，我们通过弹性绳向腰带施加双侧力（10%体重），同时年轻和老年受试者在电动跑步机上以1.3 m/s的速度摆动手臂和不摆动手臂，从而提供外部外侧稳定。我们发现，在老年人和年轻人中，外部稳定剂降低代谢能量消耗的净速率的程度相似。当受试者不摆动手臂行走时，这种减少（6-7%）比正常行走时（3-4%）更大。当年轻或老年受试者在没有外部稳定的情况下行走时消除手臂摆动时，净代谢功率增加5- 6%。我们的结论是，老年人行走的代谢成本更大，并不是由更大的侧向稳定成本造成的。此外，手臂摆动可能通过促进稳定性来降低年轻人和老年人行走的代谢成本。
To gain insight into the mechanical determinants of walking energetics, we investigated the effects of aging and arm swing on the metabolic cost of stabilization. We tested two hypotheses: 1) elderly adults consume more metabolic energy during walking than young adults because they consume more metabolic energy for lateral stabilization, and 2) arm swing reduces the metabolic cost of stabilization during walking in young and elderly adults. To test these hypotheses, we provided external lateral stabilization by applying bilateral forces (10% body weight) to a waist belt via elastic cords while young and elderly subjects walked at 1.3 m/s on a motorized treadmill with arm swing and with no arm swing. We found that the external stabilizer reduced the net rate of metabolic energy consumption to a similar extent in elderly and young subjects. This reduction was greater (6–7%) when subjects walked with no arm swing than when they walked normally (3–4%). When young or elderly subjects eliminated arm swing while walking with no external stabilization, net metabolic power increased by 5–6%. We conclude that the greater metabolic cost of walking in elderly adults is not caused by a greater cost of lateral stabilization. Moreover, arm swing reduces the metabolic cost of walking in both young and elderly adults likely by contributing to stability.
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