Age and muscle strength mediate the age-related biomechanical plasticity of gait
Age and muscle strength mediate the age-related biomechanical plasticity of gait
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DOI：
10.1007/s00421-015-3312-8
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发表时间：
2016-04-01
影响因子：
3
通讯作者：
DeVita, Paul
中科院分区：
文献类型：
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作者：
Hortobagyi, Tibor;Rider, Patrick;DeVita, Paul
与年轻人相比，老年人行走时踝关节的机械输出减少，髋部的机械输出增加。我们研究了年龄、腿部力量或两者与步态期间机械输出的年龄相关变化相关的观点。健康年轻人（n = 32，年龄 21.5 岁）和老年人（n = 32，年龄 76.8 岁）以 1.5 m/s 的速度参与生物力学步态分析，并测量了最大腿部力量。分析 1 证实了之前的数据，即与年轻人相比，老年人行走时髋部正功多出 50%，并且脚踝积极工作量减少 18%。分析 2 显示，腿部力量不会影响年龄相似的受试者组的步态动力学。在较弱的年轻人和较强壮的老年人组中，分析 3 显示老年人行走时髋部正做功仍高出 23%。分析 4 中的关节相互作用组表明，与强壮的老年人相比，虚弱的老年人对髋部的依赖更大，对脚踝的依赖更少。年龄和腿部力量都会导致步态期间机械输出的年龄相关变化。运动处方通常针对膝关节伸肌，也应涉及踝关节和髋关节肌肉。
Old compared with young adults walk with reduced ankle and increased hip mechanical output. We examined the idea that age, leg strength, or both are related to the age-related changes in mechanical output during gait.Healthy young (n = 32, age 21.5 years) and old adults (n = 32, age 76.8 years) participated in biomechanical gait analyses at 1.5 m/s and were also measured for maximal leg strength.Analysis 1 confirmed previous data as old compared with young adults walked with 50 % more hip positive work and 18 % less ankle positive work. Analysis 2 showed that leg strength did not affect gait kinetics in groups of subjects with similar ages. In a weak young and a strong old group, Analysis 3 showed that old adults still walked with 23 % greater hip positive work. The group by joint interaction in Analysis 4 was suggestive of an even greater reliance on hip and less reliance on ankle work in weak compared with strong old adults.Age and leg strength both contribute to the age-related changes in mechanical output during gait. Exercise prescription, normally targeting the knee extensors, should also involve ankle and hip muscles.