Walking Speed at Self-Selected Exercise Pace Is Lower but Energy Cost Higher in Older Versus Younger Women
Walking Speed at Self-Selected Exercise Pace Is Lower but Energy Cost Higher in Older Versus Younger Women
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DOI：
10.1123/jpah.6.3.327
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发表时间：
2009-05-01
影响因子：
3.1
通讯作者：
Legge, Michael
中科院分区：
文献类型：
--
作者：
Jones, Lynnette M.;Waters, Debra L.;Legge, Michael
背景：步行通常以与最低代谢成本一致的速度进行。然而，衰老会改变速度成本关系，因为首选步行速度会降低，能量成本会增加。目前尚不清楚当老年女性将步行作为一种锻炼方式时，这种关系会受到多大程度的影响。本研究的目的是比较老年和年轻女性以自行选择的运动速度步行 30 分钟的能量消耗。方法：通过测量 18 名年轻（25 至 49 岁）和 20 名老年（50 至 79 岁）女性的耗氧量能量当量来评估步行的能量消耗，这些女性被要求在电动跑步机上以“正常”运动速度步行 30 分钟。结果：与年轻女性相比，老年女性的特定群体步行净成本 (Cw) 高 15%，自主选择步行速度低 23%。当速度保持恒定时，老年女性的 Cw 高出 0.30 (J . kg(-1) . m(-1))。结论：首选的运动速度会导致老年女性的代谢成本更高，在推荐步行作为运动方式时需要考虑到这一点。
Background: Walking is usually undertaken at a speed that coincides with the lowest metabolic cost. Aging however, alters the speed cost relationship, as preferred walking speeds decrease and energy costs increase. It is unclear to what extent this relationship is affected when older women undertake walking as an exercise modality. The aim of this study was to compare the energetic cost of walking at a self-selected exercise pace for 30 min in older and younger women. Methods: The energetic cost of walking was assessed using the energy equivalent of oxygen consumption measured in 18 young (25 to 49 y) and 20 older (50 to 79 y) women who were asked to walk at their "normal" exercise pace on a motorized treadmill for 30 min. Results: The mass-specific net cost of walking (Cw) was 15% higher and self-selected walking speed was 23% lower in the older women than in the younger group. When speed was held constant, the Cw was 0.30 (J . kg(-1) . m(-1)) higher in the older women. Conclusions: Preferred exercise pace incurs a higher metabolic cost in older women and needs be taken into consideration when recommending walking as an exercise modality.