Kuo Hsu-Ko, Leveille Suzanne G, Yen Chung-Jen, Chai Huei-Ming, Chang Chia-Hsuin, Yeh Yu-Chi, Yu Yau-Hua, Bean Jonathan F
Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan.
Am J Phys Med Rehabil. 2006 Aug;85(8):650-8. doi: 10.1097/01.phm.0000228527.34158.ed.
To investigate the relation of both peak leg power and usual gait speed in their association with varying domains of late-life disability.
Participants (> or =60 yrs of age, n = 1753) were from the National Health and Nutrition Examination Survey, 1999-2002. Disability in activities of daily living, instrumental activities of daily living, leisure and social activities, lower limb mobility, and general physical activities was obtained by self-report. Peak muscle power was the product of isokinetic peak leg torque and peak force velocity. Functional limitations were evaluated via usual gait speed, which was obtained from a 20-foot timed walk.
Low usual gait speed was associated with disability independent of basic demographics, cognitive performance, co-morbidities, health behaviors, and inflammatory markers. The odds ratios for disabilities in activities of daily living, instrumental activities of daily living, leisure and social activities, lower limb mobility, and general physical activities for each standard-deviation increase in walking speed were 0.72 (95% confidence interval [CI], 0.59-0.87), 0.63 (95% CI, 0.52-0.77), 0.57 (95% CI, 0.45-0.72), 0.56 (95% CI, 0.47-0.67), and 0.74 (95% CI, 0.64-0.85), respectively. The odds ratios for disabilities in activities of daily living, instrumental activities of daily living, leisure and social activities, lower limb mobility, and general physical activities for each standard-deviation increase in leg power were 0.70 (95% CI, 0.55-0.89), 0.67 (95% CI, 0.53-0.86), 0.62 (95% CI, 0.47-0.83), 0.58 (95% CI, 0.47-0.72), and 0.73 (95% CI, 0.61-0.87), respectively. Supplementary adjustment for walking speed mildly attenuated the relation of leg power to disability.
Peak leg power and habitual gait speed were associated with varying domains of late-life disability. The association between peak leg power and disability seems to be partially mediated through usual gait speed.
研究腿部峰值功率和日常步速与老年残疾不同领域之间的关系。
参与者（年龄≥60岁，n = 1753）来自1999 - 2002年的美国国家健康与营养检查调查。通过自我报告获取日常生活活动、工具性日常生活活动、休闲和社交活动、下肢活动能力以及一般身体活动方面的残疾情况。峰值肌肉功率是等速峰值腿部扭矩与峰值力速度的乘积。功能受限情况通过日常步速进行评估，日常步速由20英尺定时步行测试得出。
低日常步速与残疾相关，且不受基本人口统计学特征、认知表现、合并症、健康行为及炎症标志物的影响。步行速度每增加一个标准差，日常生活活动、工具性日常生活活动、休闲和社交活动、下肢活动能力以及一般身体活动方面残疾的优势比分别为0.72（95%置信区间[CI]，0.59 - 0.87）、0.63（95% CI，0.52 - 0.77）、0.57（95% CI，0.45 - 0.72）、0.56（95% CI，0.47 - 0.67）和0.74（95% CI，0.64 - 0.85）。腿部功率每增加一个标准差，日常生活活动、工具性日常生活活动、休闲和社交活动、下肢活动能力以及一般身体活动方面残疾的优势比分别为0.70（95% CI，0.55 - 0.89）、0.67（95% CI，0.53 - 0.86）、0.62（95% CI，0.47 - 0.83）、0.58（95% CI，0.47 - 0.72）和0.73（95% CI，0.61 - 0.87）。对步行速度进行补充调整后，腿部功率与残疾之间的关系略有减弱。
腿部峰值功率和习惯性步速与老年残疾的不同领域相关。腿部峰值功率与残疾之间的关联似乎部分通过日常步速介导。
