W Prime：老年女性步态速度新预测指标的循证建议。
W Prime: Evidence-Based Proposal for a New Predictor of Gait Speed in Older Women.
作者信息
de Oliveira Júnior Gersiel Nascimento, de Sousa Jairo de Freitas Rodrigues, Carneiro Marcelo Augusto da Silva, Martins Fernanda Maria, Santagnello Samarita Beraldo, Nomelini Rosekeila Simões, de Oliveira Assumpção Cláudio, Souza Markus Vinícius Campos, Orsatti Fábio Lera
机构信息
Applied Physiology, Nutrition and Exercise Research Group (PhyNER), Exercise Biology Research Laboratory (BioEx), Institute of Health Science, Federal University of Triangulo Mineiro (UFTM), Uberaba 38025-180, MG, Brazil.
Metabolism, Nutrition, and Exercise Laboratory, Physical Education and Sport Center, State University of Londrina, Londrina 86057-970, PR, Brazil.
出版信息
Muscles. 2023 Aug 24;2(3):286-298. doi: 10.3390/muscles2030022.
BACKGROUND
The hyperbolic torque-duration curve depicts critical torque (CT) and W prime (W'), with the curve's asymptote representing CT as the boundary between heavy- and severe-intensity domains. W', the curvature constant, indicates cumulative work beyond CT. This study investigated age-related reductions in W', CT, and gait speed, and whether W' and CT predict gait speed independently of muscle torque.
METHODS
three groups (adults, middle-aged, older) totaling 131 women were studied. W' and CT were determined using 60 maximal isometric voluntary contractions of knee extensors. The fast gait speed was calculated in walking tests at 10 m, 400 m, and six minutes (6 MWT).
RESULTS
gait speed decreased ( < 0.05) with age, as did W' and CT. Both W' and CT correlated positively with gait speed at different distances (10 m, 400 m, 6 MWT). Adjusted for maximum muscle torque, only W' maintained a positive association ( < 0.05) with all gait speed tests (10 m: β = 0.201, SE = 0.086; 400 m: β = 0.262, SE = 0.085; 6 MWT: β = 0.187, SE = 0.086).
CONCLUSIONS
aging led to declines in W', CT, and gait speed. W', not CT, remained a significant predictor of gait speed, indicating its importance for older women's mobility.
背景
双曲扭矩-持续时间曲线描绘了临界扭矩（CT）和W'，曲线的渐近线将CT表示为重度和极重度强度域之间的边界。曲率常数W'表示超过CT的累积功。本研究调查了与年龄相关的W'、CT和步速下降情况，以及W'和CT是否独立于肌肉扭矩预测步速。
方法
对总共131名女性的三组人群（成年人、中年人和老年人）进行了研究。通过对膝关节伸肌进行60次最大等长自主收缩来测定W'和CT。在10米、400米步行测试和六分钟步行试验（6MWT）中计算快速步速。
结果
步速随年龄下降（P<0.05），W'和CT也如此。W'和CT在不同距离（10米、400米、6MWT）下均与步速呈正相关。在调整最大肌肉扭矩后，只有W'在所有步速测试中保持正相关（P<0.05）（10米：β=0.201，标准误=0.086；400米：β=0.262，标准误=0.085；6MWT：β=0.187，标准误=0.086）。
结论
衰老导致W'、CT和步速下降。W'而非CT仍然是步速的重要预测指标，表明其对老年女性活动能力的重要性。
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