Association Between Muscle Activation and Metabolic Cost of Walking in Young and Old Adults
Association Between Muscle Activation and Metabolic Cost of Walking in Young and Old Adults
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DOI：
10.1093/gerona/glr008
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发表时间：
2011-05-01
影响因子：
5.1
通讯作者：
DeVita, Paul
中科院分区：
文献类型：
--
作者：
Hortobagyi, Tibor;Finch, Adria;DeVita, Paul
背景。与年轻人相比，健康老年人步行的净代谢成本（C-w）以及激动剂和拮抗剂腿部肌肉的神经激活水平更高。本研究探讨了C-w与青年和老年人激动剂肌肉活性和拮抗剂协同活性之间的关系。年轻人和老年人在跑步机上以0.98米/秒的速度在6%的下降、水平和6%的倾斜上行走，同时测量了C-w和腿部肌肉的神经激活。C-w在老年人中分别为7.0%（倾斜）、19.2%（水平）和47.3%（下降）（总体18.3%）。老年人（67.1%）与年轻人（40.1%）相比，在步态任务中腿部肌肉激活率高67.3%，拮抗剂肌肉协同激活率高152.8%（老年人：67.1%，年轻人：19.9%）。激动剂肌肉激活与C-w倾斜无关，但它解释了高达42%（水平），48%（下降）和70%（三个任务组合）的C-w方差。拮抗剂共激活占c -w方差的41%（倾斜），45%（水平），59%（下降），39%（三个任务组合）。步态中腿部肌肉招募模式的年龄相关适应显著促进了老年人的高C-w。临床干预优化步态时腿部肌肉的神经控制可以减少C-w，从而减少老年人运动和日常生活活动所需的相对努力。
Background. The net metabolic cost of walking (C-w) as well as the level of neural activation of agonist and antagonist leg muscles are higher in healthy old compared with young adults. This study examined the association between C-w and agonist muscle activity and antagonist coactivity in young and old adults.Methods. Young and old adults walked at 0.98 m/s on a treadmill set at 6% decline, level, and 6% incline, while C-w and neural activation of leg muscles were measured.Results. C-w was 7.0% (incline), 19.2% (level), and 47.3% (decline) higher in old adults (overall 18.3%). Old (67.1%) versus young (40.1%) adults activated their leg muscles 67.3% more during the gait tasks and had 152.8% higher antagonist muscle coactivation (old: 67.1%, young: 19.9%). Agonist muscle activation was unrelated to C-w on incline, but it explained up to 42% (level), 48% (decline), and 70% (three tasks combined) of variance in C-w. Antagonist coactivation accounted for up to 41% (incline), 45% (level), 59% (decline), 39% (three tasks combined) of variance in C-w.Conclusions. Age-related adaptations in the recruitment pattern of leg muscles during gait significantly contribute to the high C-w in old adults. Clinical interventions optimizing the neural control of leg muscles during gait could reduce C-w consequently the relative effort needed for exercise and activities of daily living in old adults.