Federal University of Rio Grande do Norte.
University of São Paulo.
Res Q Exerc Sport. 2021 Mar;92(1):1-10. doi: 10.1080/02701367.2019.1699233. Epub 2020 Feb 5.
The aim of this study was to compare strength-endurance handgrip performance and muscle coactivation between judo athletes and untrained young males. The sample was 38 judo athletes and 38 untrained young males, between 12 and 15 years-old. Maturational status was evaluated by age at peak height velocity. A maximal isometric handgrip test (three 5-s repetitions, with 90-s intervals) and an isometric strength-endurance handgrip test (ten 10-s all-out isometric handgrip repetitions, 20-s intervals) was conducted in dominant (D) and nondominant (ND) hands, using a dynamometer with EMG monitor to detect muscle activation. ANCOVA analysis, controlling for maturational status, showed that judo athletes had higher values of maximal absolute (D = 33.6 ± 8.9 kgf vs 29.1 ± 9.0 kgf; ND = 33.8 ± 9.9 kgf vs 28.1 ± 8.1 kgf) and relative strength to body mass (D = 0.64 ± 0.12 kg/kgf vs 0.57 ± 0.13 kg/kgf; ND = 0.64 ± 0.16 kg/kgf vs 0.56 ± 0.14 kg/kgf). Moreover, judo athletes presented lower strength mean fatigue index (33.2 ± 6.9 % vs 37.9 ± 8.7 %) and muscle coactivation (48 ± 19.8 % vs 57.5 ± 22 %), only in the dominant hand, during the isometric strength-endurance handgrip test. During all repetitions of isometric endurance test there were no group or interaction between factors effects for absolute strength, relative strength and muscle coactivation. In summary, judo athletes present higher maximal absolute and relative strength and strength-endurance performance, concomitantly with decreased muscles co-activation (primary in dominant hand) during handgrip tests.
本研究旨在比较柔道运动员和未经训练的年轻男性的力量耐力握力表现和肌肉协同激活。样本包括 38 名柔道运动员和 38 名未经训练的年轻男性，年龄在 12 至 15 岁之间。成熟状态通过峰值身高速度时的年龄进行评估。使用带有肌电图监测器的测力计进行最大等长握力测试（三次 5 秒重复，间隔 90 秒）和等长力量耐力握力测试（十次 10 秒全力等长握力重复，间隔 20 秒），用于检测肌肉激活。协方差分析，控制成熟状态，显示柔道运动员具有更高的最大绝对（D 手= 33.6 ± 8.9 kgf 比 29.1 ± 9.0 kgf；ND 手= 33.8 ± 9.9 kgf 比 28.1 ± 8.1 kgf）和相对力量与体重（D 手= 0.64 ± 0.12 kg/kgf 比 0.57 ± 0.13 kg/kgf；ND 手= 0.64 ± 0.16 kg/kgf 比 0.56 ± 0.14 kg/kgf）。此外，在等长力量耐力握力测试中，柔道运动员表现出较低的力量平均疲劳指数（33.2 ± 6.9% 比 37.9 ± 8.7%）和肌肉协同激活（48 ± 19.8% 比 57.5 ± 22%），仅在优势手。在等长耐力测试的所有重复中，绝对力量、相对力量和肌肉协同激活均无组间或因素间效应。总之，柔道运动员在握力测试中表现出更高的最大绝对和相对力量以及力量耐力表现，同时伴随着肌肉协同激活的降低（主要在优势手）。
