Energy cost of walking and gait instability in healthy 65-and 80-yr-olds
Energy cost of walking and gait instability in healthy 65-and 80-yr-olds
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DOI：
10.1152/japplphysiol.01106.2002
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发表时间：
2003-12-01
影响因子：
3.3
通讯作者：
Caillaud, C
中科院分区：
文献类型：
--
作者：
Malatesta, D;Simar, D;Caillaud, C
这项研究测试了健康老年人较低的步行经济性是否是由于步态不稳定所致。我们比较了80岁老人（G80, n = 10）、65岁老人（G65, n = 10）和年轻对照组（G25, n = 10）在六种不同速度的跑步机上行走的能量消耗和步态不稳定性（通过步幅时间的步幅变化来评估）。不同步行速度下，G80的步行能量成本均高于G25 （P < 0.05）。G80组（2.31 +/- 0.68%）和G65组（1.93 +/- 0.39%）比G25组（1.40 +/- 0.30%,P < 0.05）显著增加。步态不稳定性与首选步行速度下的步行能量消耗之间无显著相关性。这些发现表明，健康老年人在行走时能量消耗更大，步态不稳定性增加。然而，这两个变量之间没有关系。能量消耗的增加可能是多因素的，我们的研究结果表明，步态不稳定可能不是这一人群的主要因素。因此，我们得出结论，其他机制，如与步行运动相关的能量消耗和与机械工作相关的能量消耗，或神经肌肉因素，更有可能与老年人步行成本较高有关。
This study tested whether the lower economy of walking in healthy elderly subjects is due to greater gait instability. We compared the energy cost of walking and gait instability (assessed by stride to stride changes in the stride time) in octogenarians (G80, n = 10), 65-yr-olds (G65, n = 10), and young controls (G25, n = 10) walking on a treadmill at six different speeds. The energy cost of walking was higher for G80 than for G25 across the different walking speeds (P < 0.05). Stride time variability at preferred walking speed was significantly greater in G80 (2.31 +/- 0.68%) and G65 (1.93 +/- 0.39%) compared with G25 (1.40 +/- 0.30%; P < 0.05). There was no significant correlation between gait instability and energy cost of walking at preferred walking speed. These findings demonstrated greater energy expenditure in healthy elderly subjects while walking and increased gait instability. However, no relationship was noted between these two variables. The increase in energy cost is probably multifactorial, and our results suggest that gait instability is probably not the main contributing factor in this population. We thus concluded that other mechanisms, such as the energy expenditure associated with walking movements and related to mechanical work, or neuromuscular factors, are more likely involved in the higher cost of walking in elderly people.