Jiménez-Lupión Daniel, Chirosa-Ríos Ignacio, Lizama-Pérez Rodrigo, Chirosa-Ríos Luis, Jerez-Mayorga Daniel
Department of Physical Education and Sports, Faculty of Sport Sciences, University of Granada, Granada, Spain.
Departamento de Ciencias Morfológicas, Facultad de Medicina y Ciencia, Universidad San Sebastián, Concepción, Chile.
J Strength Cond Res. 2025 Jun 10;39(9):e1112-e1118. doi: 10.1519/JSC.0000000000005173.
Jiménez-Lupión, D, Chirosa-Ríos, I, Lizama-Pérez, R, Chirosa-Ríos, L, and Jerez-Mayorga, D. A novel method for assessing load-velocity profiles with a motorized resistance device in the sit-to-stand test in older adults. J Strength Cond Res 39(9): e1112-e1118, 2025-The load-velocity (L-V) relationship correlates external load and lifting velocity, and the 2-point method for determining this relationship has become a reliable way to assess muscle mechanical capacities. This assessment could prove highly valuable in geriatrics and aging research because it helps identify early declines in muscle strength and power. Functional Electromechanical Dynamometry (FEMD) enables load, velocity, and power measurements during multijoint tasks, like the sit-to-stand (STS) test, facilitating comprehensive muscle function assessment in older adults. This study aimed to evaluate the test-retest reliability and concurrent validity of the 2-point method for determining the L-V relationship using FEMD during loaded STS tasks. Thirty healthy subjects (23 women, 7 men; mean age 61 ± 9.33 years; mean body mass 70.5 ± 14.7 kg; mean height 1.59 ± 0.07 m) participated. They performed unloaded and loaded 5-STS tasks with FEMD. Mean velocities from all loads were used to calculate individual L-V relationships. The absolute reliability demonstrated acceptable repeatability for L 0 (i.e., load at zero velocity) (coefficient of variation [CV]: 9.97%; intraclass correlation coefficient [ICC]: 0.94), V 0 (i.e., velocity at zero load) (CV: 5.70%; ICC: 0.95), and A line (i.e., the area under the L-V relationship line) (CV: 7.60%; ICC: 0.98) with a CV < 10% in all cases. Regarding the concurrent validity of A line variable with respect to mean mechanical power, a high correlation was observed ( r = 0.82; p = < 0.001). This study confirms the reliability and validity of the 2-point method using FEMD for assessing L-V relationships and muscle power during 5-STS in older adults.
希门尼斯 - 卢皮翁，D；奇罗萨 - 里奥斯，I；利萨马 - 佩雷斯，R；奇罗萨 - 里奥斯，L；赫雷斯 - 马约尔加，D。一种在老年人坐立试验中使用电动阻力装置评估负荷 - 速度曲线的新方法。《力量与体能研究杂志》39(9): e1112 - e1118，2025年——负荷 - 速度（L - V）关系将外部负荷与提升速度联系起来，确定这种关系的两点法已成为评估肌肉机械能力的可靠方法。这种评估在老年医学和衰老研究中可能具有极高价值，因为它有助于识别肌肉力量和功率的早期下降。功能性机电测力法（FEMD）能够在多关节任务（如坐立试验（STS））期间测量负荷、速度和功率，便于对老年人的肌肉功能进行全面评估。本研究旨在评估在负重STS任务期间使用FEMD确定L - V关系的两点法的重测信度和同时效度。30名健康受试者（23名女性，7名男性；平均年龄61±9.33岁；平均体重70.5±14.7千克；平均身高1.59±0.07米）参与了研究。他们使用FEMD进行了无负荷和负重的5次坐立任务。所有负荷下的平均速度用于计算个体的L - V关系。绝对信度表明，L0（即零速度时的负荷）（变异系数[CV]：9.97%；组内相关系数[ICC]：0.94）、V0（即零负荷时的速度）（CV：5.70%；ICC：0.95）和A线（即L - V关系线下方的面积）（CV：7.60%；ICC：0.98）在所有情况下的CV均<10%，具有可接受的重复性。关于A线变量相对于平均机械功率的同时效度，观察到高度相关性（r = 0.82；p = <0.00）。本研究证实了在老年人5次坐立试验期间使用FEMD评估L - V关系和肌肉功率的两点法的信度和效度。
