Manning John, Heselton Hyeon Jung, Venema Dawn M, Boron Julie B, Yentes Jennifer M
Department of Kinesiology & Sport Management, Texas A&M University, College Station, TX, USA.
Department of Gerontology, University of Nebraska at Omaha, Omaha, NE, USA.
Sci Rep. 2025 Mar 7;15(1):7988. doi: 10.1038/s41598-025-92746-7.
Physical resilience is the ability to recover from an external perturbation, an integral aspect of functional adaptability and healthy behavior. Techniques that quantify behavior over multiple time scales offer a solution to quantifying resilience. As people age, they tend to lose functional adaptability and resilience. However, age-related declines in resilience between middle-aged and older adults is unclear. This study compared the difference in the ability to recover to baseline following standing balance perturbations between middle-aged and older adults, and between those that do or do not recover to baseline. Thirty-eight middle-aged and thirty-one older adults stood on a force platform during five, 60-sec trials. The platform moved posteriorly a specified distance during each trial (2.54 to 12.7 cm). Detrended fluctuation analysis (DFA) was calculated on anteroposterior center of pressure with moving windows of five seconds. Baseline DFA alpha (BA) was obtained by averaging windows before the perturbation. Directly after the perturbation, windows were analyzed until the DFA recovered within a set criterion of BA, called recovery Alpha (RA). If DFA didn't meet the criterion, DFA of the last window was taken as the RA. Trials were coded as recovery and non-recovery. There was a significant interaction between age and Recover or No recovery on RA. Older adult non-recoverers had a significantly lower RA than middle-aged adults and older adult recoverers. Older adults who did not recover to baseline exhibited less persistent sway, evidenced by decreases in RA. Older adult non-recoverers demonstrating decreased DFA indicates decreased resilience.
身体恢复力是从外部扰动中恢复的能力，是功能适应性和健康行为的一个重要方面。在多个时间尺度上量化行为的技术为量化恢复力提供了一种解决方案。随着人们年龄的增长，他们往往会失去功能适应性和恢复力。然而，中年人和老年人之间与年龄相关的恢复力下降情况尚不清楚。本研究比较了中年人和老年人之间，以及那些恢复到基线和未恢复到基线的人在站立平衡扰动后恢复到基线能力的差异。38名中年人和31名老年人在5次60秒的试验中站在一个测力平台上。在每次试验中，平台向后移动指定的距离（2.54至12.7厘米）。使用5秒的移动窗口对前后压力中心进行去趋势波动分析（DFA）。通过对扰动前的窗口进行平均获得基线DFAα（BA）。扰动后，立即分析窗口，直到DFA在BA的设定标准内恢复，称为恢复α（RA）。如果DFA未达到标准，则将最后一个窗口的DFA作为RA。试验被编码为恢复和未恢复。在RA上，年龄与恢复或未恢复之间存在显著的交互作用。未恢复的老年人的RA显著低于中年人和恢复的老年人。未恢复到基线的老年人表现出较小的持续摆动，RA降低证明了这一点。未恢复的老年人DFA降低表明恢复力下降。
