Metabolism, Nutrition and Exercise Laboratory, Physical Education and Sport Center, State University of Londrina, Londrina, Brazil.
Metabolism, Nutrition and Exercise Laboratory, Physical Education and Sport Center, State University of Londrina, Londrina, Brazil.
Exp Gerontol. 2021 Jul 1;149:111322. doi: 10.1016/j.exger.2021.111322. Epub 2021 Mar 22.
We compared the magnitude of muscular strength changes among older women occupants of different strength tertiles in response to progressive resistance-training (RT). Additionally, we examined the possibility of older women initially characterized as weak (occupants of the lower tertile of strength status) can achieve a higher muscular strength level to be inserted into a better category (middle or upper tertiles). The present investigation was attended by 113 physically independent older women (>60 years old). Muscular strength was assessed by one-repetition maximum (1RM) tests on chest press, preacher curl, leg extension exercises, and by the isokinetic (ISOK) peak torque of knee extension and flexion at 60 and 180°/s angular velocities. The RT lasted 12 weeks (3 x/week) and consisted of eight exercises for the whole body. The participants were divided into tertiles (LOWER, MIDDLE, and UPPER) according to the performance at baseline for each strength measure. After RT, the LOWER tertile showed more significant magnitude gains than the UPPER tertile to the 1RM in leg extension and preacher curl and isokinetic measurements (6.9-36.3%). A considerable number of older women increased muscular strength enough to move from LOWER to MIDDLE or UPPER tertiles. From our results, it can be inferred that older women occupants of the lower strength tertile show more significant muscular strength gains when compared to their stronger counterparts. Moreover, 12 weeks of RT seem to be sufficient to transfer older women previously characterized as "weak" to a better category.
我们比较了不同力量三分位的老年女性居住者在进行渐进式抗阻训练（RT）后肌肉力量变化的幅度。此外，我们还研究了最初被归类为较弱的老年女性（处于力量状态三分位较低端的居住者）是否有可能达到更高的肌肉力量水平，从而进入更好的类别（中或高端）。本研究共有 113 名身体独立的老年女性（>60 岁）参加。肌肉力量通过胸部按压、牧师弯举、腿伸展运动的 1 次重复最大（1RM）测试以及 60 和 180°/s 角速度时膝关节伸展和屈曲的等速（ISOK）峰值扭矩来评估。RT 持续 12 周（每周 3 次），包括全身 8 个练习。参与者根据每个力量测量的基线表现分为三分位（LOWER、MIDDLE 和 UPPER）。在 RT 后，LOWER 三分位在腿伸展和牧师弯举的 1RM 以及等速测量中显示出比 UPPER 三分位更大的幅度增益（6.9-36.3%）。相当数量的老年女性增加了足够的肌肉力量，从 LOWER 三分位移动到 MIDDLE 或 UPPER 三分位。从我们的结果可以推断，处于较低力量三分位的老年女性居住者在肌肉力量增长方面比力量较强的居住者更为显著。此外，12 周的 RT 似乎足以将之前被归类为“弱”的老年女性转移到更好的类别。
