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首页> 外文期刊>The journals of gerontology.Series A. Biological sciences and medical sciences >Lower extremity strength plays only a small role in determining the maximum recoverable lean angle in older adults.
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Lower extremity strength plays only a small role in determining the maximum recoverable lean angle in older adults.

机译：下肢力量在确定老年人的最大可恢复倾斜角中只起很小的作用。

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BACKGROUND: The purpose of this study was to determine the extent to which measures of lower extremity strength and power contribute to the ability of older men and women to restore postural equilibrium using a single-step recovery following a large postural disturbance. METHODS: The postural disturbance, which has been used as a surrogate for forward-directed falls, involved a sudden release from a forward-leaning angle. The ability to recover using a single step was evaluated as the maximum recoverable lean angle for 56 healthy older women and men. Maximum voluntary isometric and isokinetic strength was measured for ankle plantarflexion and dorsiflexion, knee flexion and extension, and hip flexion and extension. Discriminant analysis was used to determine the strength measures that best classified participants as members of the highest (n = 14) or lowest (n = 14) quartiles of maximum recoverable lean angle. Those variables were subsequently entered into a regression analysis to characterize the relationship between strength and maximum recoverable lean angle for the entire participant sample. RESULTS: Maximum isokinetic dorsiflexion strength at 90 degrees /s satisfied the criteria of the stepwise discriminant analysis, and correctly classified 82.1% of the participants in the highest or lowest quartiles of maximum recoverable lean angle. The multiple regression procedure, performed on all participants (n = 56) revealed a significant quadratic relationship between maximum isokinetic dorsiflexion strength at 90 degrees /s and maximum recoverable lean angle (R2 = 0.295; p <.001). CONCLUSIONS: Lower extremity strength makes a small, but significant contribution to maximum recoverable lean angle. However, because 70% of the shared variability remained unaccounted for, it is suggested that other performance factors, such as coordination, may be of greater importance to performance of this time-critical motor task.
机译：背景：本研究的目的是确定下肢力量和力量的测量值在多大程度的姿势紊乱后通过单步恢复对老年男性和女性恢复姿势平衡的能力的影响程度。方法：姿势障碍已被用作向前跌倒的替代物，涉及从向前倾斜的角度突然释放。将一步恢复的能力评估为56位健康的老年男女的最大可恢复倾斜角。测量踝关节plant屈和背屈，膝关节屈伸，髋关节屈伸的最大自愿等距和等速力量。判别分析用于确定将最佳参与者归类为最大可恢复倾斜角的最高四分位（n = 14）或最低四分位（n = 14）的强度度量。随后将这些变量输入回归分析，以表征整个参与者样本的强度和最大可恢复倾斜角之间的关系。结果：90度/秒的最大等速背屈强度满足逐步判别分析的标准，并在最大可恢复倾斜角的最高或最低四分位数中正确分类了82.1％的参与者。对所有参与者（n = 56）执行的多元回归程序显示，在90度/ s的最大等速背屈强度与最大可恢复倾斜角之间存在明显的二次关系（R2 = 0.295; p <.001）。结论：下肢力量对最大可恢复倾斜角的影响很小，但影响很大。但是，由于仍未解决70％的共享变异性，因此建议其他性能因素（例如协调性）对于此时间紧迫的运动任务的执行可能更为重要。

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