Smith Tyler M, Hester Garrett M, Ha Phuong L, Olmos Alex A, Stratton Matthew T, VanDusseldorp Trisha A, Feito Yuri, Dalton Benjamin E
Department of Molecular and Cellular Biology, Kennesaw State University, Kennesaw, GA, 30144, United States.
Department of Exercise Science and Sport Management, Kennesaw State University, Kennesaw, GA, 30144, United States.
Arch Gerontol Geriatr. 2020 Nov/Dec;91:104215. doi: 10.1016/j.archger.2020.104215. Epub 2020 Jul 30.
To compare sit-to-stand (STS) kinetics in young (YM) and older (OM) males and determine correlates of STS performance.
YM (n = 15, age = 20.7 ± 2.2 yrs) and OM (n = 15, age = 71.6 ± 3.9 yrs) performed a single STS task as quickly as possible on a force plate and the vertical ground reaction force (VGRF) signal was analyzed. Peak VGRF, as well as peak (100 ms rolling average), early (minimum VGRF to 50% peak VGRF), late (50% peak VGRF to peak VGRF), and overall (minimum VGRF to peak VGRF) rate of force development (RFD) were calculated. Power (absolute and relative) and velocity parameters as well as rate of electromyography rise (RER) were also obtained.
STS time, average power, early RFD, and lower limb lean mass were similar between groups (p > 0.05). All other power, velocity, RFD, and RER measures were lower in OM (p < 0.05; d = 0.41-2.19). Peak VGRF and all RFD measures, except late RFD, were strongly correlated with STS performance in OM, while peak VGRF and peak RFD were only moderately correlated with performance in YM.
Most kinetic variables, except absolute average power, were diminished in OM, and there was a preferential decrease in late RFD compared to early RFD. Peak VGRF and RFD exhibited stronger correlations with STS time and power in OM compared to YM, and early RFD appears to be more influential for STS performance than late RFD. These findings may be useful for practitioners/clinicians involved in designing interventions aimed at optimizing STS performance in older adults.
比较年轻男性（YM）和老年男性（OM）从坐起到站立（STS）的动力学特征，并确定与STS表现相关的因素。
YM组（n = 15，年龄 = 20.7 ± 2.2岁）和OM组（n = 15，年龄 = 71.6 ± 3.9岁）在测力台上尽快完成单次STS任务，并分析垂直地面反作用力（VGRF）信号。计算VGRF峰值以及峰值（100毫秒滚动平均值）、早期（最小VGRF到50%峰值VGRF）、晚期（50%峰值VGRF到峰值VGRF）和总体（最小VGRF到峰值VGRF）力发展速率（RFD）。还获取了功率（绝对和相对）、速度参数以及肌电图上升速率（RER）。
两组之间的STS时间、平均功率、早期RFD和下肢瘦体重相似（p > 0.05）。OM组的所有其他功率、速度、RFD和RER测量值均较低（p < 0.05；d = 0.41 - 2.19）。除晚期RFD外，峰值VGRF和所有RFD测量值与OM组的STS表现密切相关，而峰值VGRF和峰值RFD与YM组的表现仅呈中度相关。
除绝对平均功率外，大多数动力学变量在OM组中均降低，与早期RFD相比，晚期RFD有优先降低的情况。与YM组相比，峰值VGRF和RFD与OM组的STS时间和功率表现出更强的相关性，并且早期RFD似乎比晚期RFD对STS表现更具影响力。这些发现可能对参与设计旨在优化老年人STS表现的干预措施的从业者/临床医生有用。
