Department of Family, Nutrition, and Exercise Sciences, Queens College, The City University of New York, Flushing, NY, United States of America.
Departments of Biomedical Engineering and Statistics, Northwestern University, Evanston, IL, United States of America.
Exp Gerontol. 2021 Mar;145:111202. doi: 10.1016/j.exger.2020.111202. Epub 2020 Dec 19.
Lower body power declines with age and is associated with decreased physical function in older adults. However, the majority of the tools available to measure power are expensive and require considerable space and expertise to operate. The purpose of this study was to assess the validity, reliability, and measurement error of a sit-to-stand power test (STSp) to assess lower body power.
51 community-dwelling adults, 65 years or older, completed a power test using a pneumatic leg press (LP), the Short Physical Performance Battery (SPPB) that includes a test of balance, usual walking speed, and chair stand tests; Timed Up and Go (TUG) test at both usual and fast paces, and Patient-Reported Outcome Measures (PROMs). A two-week test-retest assessed the reliability in 36 participants. The study hypotheses and analysis were pre-registered prior to data collection and statistical analyses were blinded.
The mean age was 71.3 years, with 63% females, and an average SPPB score of 10.6 (median = 12). STSp peak power was strongly correlated with LP (r = 0.90, 95% CI (0.82, 0.94). As hypothesized, the STSp peak power showed similar or higher correlations with physical function tests relative to LP peak power: SPPB (0.41 vs. 0.29), chair stand test (-0.44 vs. -0.35), TUG test at usual pace (-0.37 vs. -0.29) and fast pace (-0.41 vs. -0.34) and balance (0.33 vs. 0.22), but not for mobility (0.34 vs. 0.38) and function (0.41 vs. 0.48) questionnaire. For discriminant validity, as hypothesized, males showed higher STSp peak power compared to females (Δ = 492 W, p < .001, Cohen's d = 2.0). Test-retest assessment yielded an intraclass correlation coefficient of 0.96 and a standard error of measurement of 70.4 W. No adverse events were reported or observed for both tests.
The STSp showed adequate validity and reliability in measuring lower body power in community-dwelling older adults. The test is quick, relatively inexpensive, safe, and portable and thus should be considered for use in aging research.
下肢力量随年龄增长而下降，与老年人身体功能下降有关。然而，大多数用于测量力量的工具都很昂贵，并且需要相当大的空间和专业知识才能操作。本研究旨在评估一种坐站力量测试（STSp）评估下肢力量的有效性、可靠性和测量误差。
51 名社区居住的成年人，年龄在 65 岁或以上，使用气动腿部按压（LP）完成力量测试，该测试包括平衡测试、常规步行速度测试和坐站测试；Timed Up and Go（TUG）测试在常规和快速速度下进行，以及患者报告的结果测量（PROMs）。在 36 名参与者中进行了为期两周的测试-再测试，以评估可靠性。研究假设和分析在数据收集和统计分析之前进行了预先注册。
平均年龄为 71.3 岁，女性占 63%，平均 SPPB 评分为 10.6（中位数=12）。STSp 峰值功率与 LP 呈强相关（r=0.90，95%置信区间（0.82，0.94）。如假设的那样，STSp 峰值功率与 LP 峰值功率相比，与身体功能测试的相关性相似或更高：SPPB（0.41 对 0.29）、坐站测试（-0.44 对-0.35）、TUG 测试在常规速度下（-0.37 对-0.29）和快速速度下（-0.41 对-0.34）以及平衡（0.33 对 0.22），但与移动性（0.34 对 0.38）和功能（0.41 对 0.48）问卷无关。对于判别有效性，如假设的那样，男性的 STSp 峰值功率高于女性（Δ=492W，p<0.001，Cohen's d=2.0）。测试-再测试评估产生了 0.96 的组内相关系数和 70.4W 的测量误差标准。两种测试均未报告或观察到不良事件。
STSp 在评估社区居住的老年人下肢力量方面具有足够的有效性和可靠性。该测试快速、相对便宜、安全且便携，因此应考虑在衰老研究中使用。
