Evidence for a non-linear relationship between leg strength and gait speed
Evidence for a non-linear relationship between leg strength and gait speed
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DOI：
10.1093/ageing/25.5.386
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发表时间：
1996-09-01
期刊：
影响因子：
6.7
通讯作者：
deLateur, BJ
中科院分区：
文献类型：
--
作者：
Buchner, DM;Larson, EB;deLateur, BJ
虽然在老年人的力量和身体性能之间的关系可能是非线性的，很少有实证研究表明，这是如此，在人口为基础的样本的成年人年龄在60-96岁（n = 409），腿部力量测量四个肌肉群（膝伸肌，膝屈肌，踝跖屈肌，踝背屈肌）的双腿使用等速测力计。腿部力量评分计算为右腿四次力量测量值的总和。在一个15.2米的过程中测量的步态速度n。用线性模型，腿的力量解释了17%的步态速度的方差。非线性模型（二次和逆）解释了显着更多的方差（22%）。这种非线性关系的本质是，在较强壮的受试者中，力量和步态速度之间没有联系，而在较弱的受试者中，有联系。体重和年龄也能解释步态速度的显著差异，而ses和身高则不能解释。结果支持了腿部力量和步态速度之间的非线性关系的假设，老年男性和女性之间的关系相似。这一发现代表了一种机制，说明生理能力的微小变化可能对虚弱成年人的表现产生重大影响，而能力的巨大变化对健康成年人的影响很小或没有影响。
Although the relationship between strength and physical performance in older adults is probably non-linear, few empirical studies have demonstrated that this is so.In a population-based sample of adults aged 60-96 years (n = 409), leg strength was measured in four muscle groups (knee extensor, knee flexor, ankle plantar flexor, ankle dorsiflexor) of both legs using an isokinetic dynamometer. A leg strength score was calculated as the sum of the four strength measurements in the right leg. Usual gait speed n as measured over a 15.2 metre course.With a linear model, leg strength explained 17% of variance in gait speed. Non-linear models (quadratic and inverse) explained significantly more variance (22%). The nature of the non-linear relationship was that, in stronger subjects, there mas no association between strength and gait speed, while in weaker subjects, there mas an association. Body weight and age also explained significant amounts of variance in gait speed, while ses and height did not.The results supported the hypothesis of a non-linear relationship between leg strength and gait speed that is similar for older men and women. This finding represents a mechanism for how small changes in physiological capacity may have substantial effects on performance in frail adults, while large changes in capacity have little or no effect in healthy adults.