Faculty of Sport and Health Sciences and Gerontology Research Center, University of Jyväskylä, Jyväskylä, FINLAND.
Faculty of Sport and Health Sciences and Neuromuscular Research Center, University of Jyväskylä, Jyväskylä, FINLAND.
Med Sci Sports Exerc. 2024 Sep 1;56(9):1672-1677. doi: 10.1249/MSS.0000000000003470. Epub 2024 May 15.
Habitual strength and power-demanding activities of daily life may support the maintenance of adequate lower extremity functioning with aging, but this has been sparingly explored. Hence, we examined whether the characteristics of free-living sit-to-stand (STS) transitions predict a decline in lower extremity functioning over a 4-yr follow-up.
A total of 340 community-dwelling older adults (60% women; age 75, 80, or 85 yr) participated in this prospective cohort study. At baseline, a thigh-worn accelerometer was used continuously (3-7 d) to monitor the number and intensity of free-living STS transitions. A decline in lower extremity functioning was defined as a drop of ≥2 points in the Short Physical Performance Battery (SPPB) from baseline to follow-up. Maximal isometric knee extension strength was measured in the laboratory.
Eighty-five participants (75% women) declined in SPPB over 4 yr. After adjusting for age, sex, and baseline SPPB points, higher free-living peak STS angular velocity (odds ratio (OR), 0.70; 95% confidence interval (CI), 0.52-0.92, per 20°·s -1 increase) protected against a future decline. When adjusting the model for maximal isometric knee extension strength, the statistical significance was attenuated (OR = 0.72; 95% CI = 0.54-0.96, per 20°·s -1 increase).
Performing STS transitions at higher velocities in the free-living environment can prevent a future decline in lower extremity function. This indicates that changes in daily STS behavior may be useful in the early identification of functional loss. Free-living peak STS angular velocity may be a factor underlying the longitudinal association of lower extremity strength and performance.
日常生活中习惯性的力量和高需求的活动可能有助于维持下肢功能随着年龄的增长而充足，但这一点很少被探索。因此，我们研究了自由生活中的坐站（STS）转换特征是否可以预测下肢功能在 4 年的随访中下降。
共有 340 名社区居住的老年人（60%为女性；年龄 75、80 或 85 岁）参加了这项前瞻性队列研究。在基线时，使用 thigh-worn 加速度计连续（3-7 天）监测自由生活中的 STS 转换次数和强度。下肢功能下降定义为从基线到随访时 Short Physical Performance Battery（SPPB）下降≥2 分。在实验室测量最大等长膝关节伸展力量。
85 名参与者（75%为女性）在 4 年内 SPPB 下降。在调整年龄、性别和基线 SPPB 分数后，较高的自由生活中峰值 STS 角速度（优势比（OR），0.70；95%置信区间（CI），0.52-0.92，每增加 20°·s -1）可以预防未来的下降。当调整模型以包含最大等长膝关节伸展力量时，统计学意义减弱（OR=0.72；95%CI=0.54-0.96，每增加 20°·s -1）。
在自由生活环境中以更高的速度进行 STS 转换可以预防未来下肢功能下降。这表明日常 STS 行为的变化可能有助于早期识别功能丧失。自由生活中的峰值 STS 角速度可能是下肢力量和表现与纵向关联的一个因素。
