Department of Physiotherapy, University College Copenhagen, DK-2200 Copenhagen, Denmark.
Department of Physiotherapy, São Paulo State University (UNESP), 305 Roberto Simonsen, Presidente Prudente, São Paulo 19060-900, Brazil.
Int J Environ Res Public Health. 2021 Mar 9;18(5):2749. doi: 10.3390/ijerph18052749.
Muscle strength assessment is fundamental to track the progress of performance and prescribe correct exercise intensity. In field settings, simple tests are preferred. This study develops equations to estimate maximal muscle strength in upper- and lower-extremity muscles based on submaximal elastic resistance tests. Healthy adults ( = 26) performed a maximal test (1 RM) to validate the ability of the subsequent submaximal tests to determine maximal muscle strength, with elastic bands. Using a within-group repeated measures design, three submaximal tests of 40%, 60%, and 80% during (1) shoulder abduction, (2) shoulder external rotation, (3) hip adduction, and (4) prone knee flexion were performed. The association between number of repetitions and relative intensity was modeled with both 1st and 2nd order polynomials to determine the best predictive validity. For both upper-extremity tests, a strong linear association between repetitions and relative intensity was found (R = 0.97-1.00). By contrast, for the lower-extremity tests, the associations were fitted better with a 2nd order polynomial (R = 1.00). The results from the present study provide formulas for predicting maximal muscles strength based on submaximal resistance in four different muscles groups and show a muscle-group-specific association between repetitions and intensity.
肌肉力量评估对于跟踪运动表现的进展和规定正确的运动强度至关重要。在野外环境中，首选简单的测试。本研究开发了基于次最大弹性阻力测试的方程，以估计上下肢肌肉的最大肌肉力量。健康成年人（n=26）进行了最大测试（1RM），以验证随后的次最大测试确定最大肌肉力量的能力，使用弹性带。采用组内重复测量设计，在（1）肩部外展、（2）肩部外旋、（3）髋关节内收和（4）俯卧位膝关节屈曲时进行了 40%、60%和 80%的三次次最大测试。用一阶和二阶多项式来模拟重复次数和相对强度之间的关系，以确定最佳的预测有效性。对于上肢测试，发现重复次数和相对强度之间存在很强的线性关系（R=0.97-1.00）。相比之下，对于下肢测试，二阶多项式拟合更好（R=1.00）。本研究的结果提供了基于四个不同肌肉群的次最大阻力预测最大肌肉力量的公式，并显示了重复次数和强度之间的肌肉群特异性关联。
