Beck Travis W, Housh Terry J, Johnson Glen O, Weir Joseph P, Cramer Joel T, Coburn Jared W, Malek Moh H, Mielke Michelle
Department of Nutrition and Health Sciences, Human Performance Laboratory, University of Nebraska-Lincoln, Lincoln, Nebraska 68583, USA.
J Strength Cond Res. 2007 Aug;21(3):757-62. doi: 10.1519/R-20536.1.
The purpose of this study was to examine the effects of 2 days of isokinetic training of the forearm flexors and extensors on strength and electromyographic (EMG) amplitude for the agonist and antagonist muscles. Seventeen men (mean +/- SD age = 21.9 +/- 2.8 years) were randomly assigned to 1 of 2 groups: (a) a training group (TRN; n = 8), or (b) a control group (CTL; n = 9). The subjects in the TRN group were tested for maximal isometric and concentric isokinetic (randomly ordered velocities of 60, 180, and 300 degrees x s(-1)) torque of the dominant forearm flexors and extensors before (pretest) and after (posttest) 2 days of isokinetic strength training. Each training session involved 6 sets of 10 maximal concentric isokinetic muscle actions of the forearm flexors and extensors at a velocity of 180 degrees x s(-1). The subjects in the CTL group were also tested for strength but did not perform any training. Surface EMG signals were detected from the biceps brachii and triceps brachii muscles during the strength testing. The results indicated that there were no significant (p > 0.05) pre- to post-test changes in forearm flexion and extension torque or EMG amplitude for the agonist and antagonist muscles. Thus, unlike previous studies of the quadriceps femoris muscles, these findings for the forearm flexors and extensors suggested that 2 days of isokinetic training may not be sufficient to elicit significant increases in strength. These results may have implications for the number of visits that are required for rehabilitation after injury, surgery, or both.
本研究的目的是检验对前臂屈肌和伸肌进行为期2天的等速训练，对主动肌和拮抗肌力量及肌电图（EMG）幅度的影响。17名男性（平均±标准差年龄=21.9±2.8岁）被随机分为2组中的1组：（a）训练组（TRN；n = 8），或（b）对照组（CTL；n = 9）。TRN组的受试者在进行2天的等速力量训练之前（预测试）和之后（后测试），接受优势前臂屈肌和伸肌的最大等长和向心等速（随机排序的60、180和300度×秒⁻¹速度）扭矩测试。每次训练包括6组，每组10次以180度×秒⁻¹速度进行的前臂屈肌和伸肌最大向心等速肌肉动作。CTL组的受试者也接受了力量测试，但未进行任何训练。在力量测试期间，从肱二头肌和肱三头肌检测表面肌电信号。结果表明，主动肌和拮抗肌的前臂屈伸扭矩或肌电幅度在测试前到测试后没有显著变化（p>0.05）。因此，与之前对股四头肌的研究不同，这些关于前臂屈肌和伸肌的研究结果表明，2天的等速训练可能不足以引起力量的显著增加。这些结果可能对损伤、手术或两者之后康复所需的就诊次数有影响。
