Faculty of Sport and Health Sciences and Gerontology Research Center, University of Jyväskylä, Jyväskylä, Finland.
Department of Movement Sciences, Physical Activity, Sports and Health Research Group, KU Leuven, Leuven, Belgium.
J Gerontol A Biol Sci Med Sci. 2022 Aug 12;77(8):1644-1653. doi: 10.1093/gerona/glac071.
Good sit-to-stand (STS) performance is an important factor in maintaining functional independence. This study investigated whether free-living STS transition volume and intensity, assessed by a thigh-worn accelerometer, is associated with characteristics related to functional independence.
Free-living thigh-worn accelerometry was recorded continuously for 3-7 days in a population-based sample of 75-, 80-, and 85-year-old community-dwelling people (479 participants; women n = 287, men n = 192). The records were used to evaluate the number and intensity (angular velocity of the STS phase) of STS transitions. Associations with short physical performance battery (SPPB), 5-times-sit-to-stand test (5×STS), isometric knee extension force, self-reported fear of falls, and self-reported difficulty in negotiating stairs were also assessed.
The number of STS transitions, mean and maximal angular velocity were lower in older age groups (p < .05). All variables were higher in men than in women (p < .001) and were positively associated with SPPB total points, knee extension force (r ranged from 0.18 to 0.39, all p < .001) and negatively associated with 5×STS (r = -0.13 - -0.24, all p < .05), lower extremity functional limitations (p < .01), fear of falls (p < .01), and stair negotiation difficulties (p < .01).
Free-living STS characteristics were related to lower-extremity performance, lower extremity functional limitations, self-reported fear of falls, and stair negotiation difficulties, which can be a sensitive indicator of impending functional decline. Moreover, STS transitions may provide an indicator of adequacy of lower-limb muscle strength among older individuals.
良好的坐站（STS）表现是维持功能独立性的重要因素。本研究探讨了通过大腿佩戴的加速度计评估的自由生活 STS 转换量和强度是否与与功能独立性相关的特征有关。
在一项基于人群的 75、80 和 85 岁社区居住者的样本中（479 名参与者；女性 n = 287，男性 n = 192），连续记录 3-7 天的自由生活大腿佩戴加速度计。记录用于评估 STS 转换的数量和强度（STS 阶段的角速度）。还评估了与短体表现电池（SPPB）、5 次坐站测试（5×STS）、等长膝关节伸展力、自我报告的跌倒恐惧和自我报告的楼梯穿越困难的相关性。
STS 转换次数、平均和最大角速度随着年龄的增加而降低（p <.05）。所有变量在男性中均高于女性（p <.001），与 SPPB 总分数、膝关节伸展力呈正相关（r 范围从 0.18 到 0.39，均 p <.001），与 5×STS 呈负相关（r = -0.13 至-0.24，均 p <.05），下肢功能受限（p <.01），跌倒恐惧（p <.01）和楼梯穿越困难（p <.01）。
自由生活 STS 特征与下肢表现、下肢功能受限、自我报告的跌倒恐惧和楼梯穿越困难有关，这可能是功能下降即将发生的敏感指标。此外，STS 转换可能是老年个体下肢肌肉力量充足的指标。
