Departures from linearity in the relationship between measures of muscular strength and physical performance of the lower extremities: The Women's Health and Aging Study
Departures from linearity in the relationship between measures of muscular strength and physical performance of the lower extremities: The Women's Health and Aging Study
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DOI：
10.1093/gerona/52a.5.m275
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发表时间：
1997-09-01
影响因子：
5.1
通讯作者：
Fried, LP
中科院分区：
文献类型：
--
作者：
Ferrucci, L;Guralnik, JM;Fried, LP
背景资料。骨质疏松症是一种与年龄相关的肌肉质量和力量减少，可能会导致身体功能下降，随后失去自主性。有人认为，力量主要与力量范围的较低部分的下肢功能有关。确定力量对功能最关键的阈值可能有助于针对可能受益最大的FI：OM运动干预的群体。方法：该研究使用了来自女性健康和老龄化研究的数据。研究人群是通过对65岁及以上的人口样本进行筛选而招募的，其中包括1002名妇女，她们代表了居住在社区中没有严重认知障碍的残疾妇女的三分之一。使用手持测功机评估膝关节伸肌和髋屈肌力量。通过行走、站立平衡和从椅子上站起来的休息来评估患者的下肢功能。在接受力量测试的女性(n=892)中，那些能够走路(97%)、并排站立(87%)或完成5个椅子站立(74%)的女性的力量明显更大。在整个力量范围内，行走速度与膝关节伸肌力量呈线性关系，但它与髋关节力量的关系被限制在15公斤以下。低于10公斤和15公斤以下的膝关节伸肌和髋屈肌力量分别与五个椅子站立的时间相关，而在这些值以上没有发现显著的关联。更强壮的女性更有可能在并排、半双列和双列姿势中保持平衡10秒。仅用力量来解释运动能力差异的百分比总是低于20%。结论，在这一人群中，不包括最强壮的老年女性，肌肉力量与下肢运动能力的某些指标之间的关系偏离了线性。
Background. Sarcopenia, an age-related reduction in muscular mass and strength, may cause a decline in physical functioning and subsequent loss of autonomy. It has been suggested that strength is associated with lower extremity function mainly in the lower portion of the range of strength. Identifying the threshold under which strength is most critical to function may help in targeting groups who may benefit most fi:om exercise interventions.Methods, The study uses data from the Women's Health and Aging Study. The study population, recruited by screening a population-based sample aged 65 years and older, comprised 1,002 women who represent the one-third most disabled women without severe cognitive impairment living in the community. Knee extensor and hip flexor strength were assessed using a hand-held dynamometer. Lower extremity performance was evaluated using rests of walking, standing balance, and rising from a chair.Results. Among women tested for strength (n = 892), those who could walk (97%), do the side-by-side stand (87%), or complete 5 chair stands (74%) had significantly greater strength. Walking speed was linearly associated with knee extensor strength over the entire range of strength, but its association with hip strength was limited to values below 15 kg. Time for five chair stands was associated with knee extensor and hip flexor strength below 10 and 15 kg, respectively, and no significant association was detected above these values. Stronger women were more likely to hold balance for 10 sec in the side-by-side, semi-tandem, and tandem positions. The percentage of the variance in performance explained by strength alone was always lower than 20%.Conclusions, In this population, which does not include the strongest older women, there is a departure from linearity in the relationship between muscular strength and some measures of lower extremity performance.