Attarieh Parsa, Nunes João Pedro, Khani Saeed, Negahdar Saman, Goli Amirali, Nazarirad Hamed, Nazarirad Shahriar, Mojtahedi Shima, Nosaka Kazunori, Soori Rahman
Department of Exercise Physiology, Faculty of Sport Sciences and Health, University of Tehran, Tehran, Iran.
Physical Education and Sport Center, Londrina State University, Londrina, Brazil.
Eur J Sport Sci. 2025 Apr;25(4):e12279. doi: 10.1002/ejsc.12279.
In the present study, the effects of resistance training on regional hypertrophy and maximum strength of the elbow flexor muscles were compared between elbow flexion exercises performed with different shoulder joint angles (∼50° of flexion vs. extension) while matched for resistance profiles. In a within-subject design, 15 young men (25.6 ± 2.1 y; 77.3 ± 6.8 kg; 175.1 ± 5.7 cm) underwent a resistance training program twice a week for 10 weeks (3-5 sets, 8-12RM), and their arms were dominant-side balanced, randomly assigned to one of the two conditions according to elbow flexion exercises: unilateral cable curl with shoulder flexed (Preacher curl; PREA) or unilateral cable curl with shoulder extended (Bayesian curl; BAYE). B-mode ultrasound imaging was used to measure changes in muscle thickness of the biceps brachii and brachialis at proximal, mid, and distal arm regions, and one-repetition maximum tests were completed in each respective trained exercise before and after training. Both conditions showed significant increases in muscle thickness (p < 0.05) with no significant differences between them (p > 0.05) across the biceps brachii proximal, mid, and distal regions (relative change [Hedges' g effect size]; PREA: 6%[0.51], 7%[0.49], 7%[0.53]; BAYE: 9%[0.73], 9%[0.62], 9%[0.62]) and brachialis (PREA: 10%[0.72]; BAYE: 8%[0.65]). Similarly, significant improvements in maximum strength were observed (p < 0.05), with equivalent results between conditions (PREA: 28%[0.85], BAYE: 37%[1.22]; equivalence testing, p-values = 0.061, 0.637). In conclusion, the shoulder joint angle does not seem to affect muscle hypertrophy and maximum strength gains after different elbow flexion exercises matched for resistance profiles.
在本研究中，我们比较了在阻力情况匹配的条件下，不同肩关节角度（约50°屈曲与伸展）进行的屈肘练习对屈肘肌局部肥大和最大力量的影响。在一项受试者内设计中，15名年轻男性（25.6±2.1岁；77.3±6.8千克；175.1±5.7厘米）每周进行两次阻力训练计划，共10周（3 - 5组，8 - 12次重复最大重量），且他们的双臂优势侧平衡，根据屈肘练习随机分配到两种情况之一：肩关节屈曲的单侧绳索弯举（牧师式弯举；PREA）或肩关节伸展的单侧绳索弯举（贝叶斯弯举；BAYE）。使用B超成像测量肱二头肌和肱肌在手臂近端、中部和远端区域的肌肉厚度变化，并在训练前后分别对每个训练练习进行一次重复最大重量测试。两种情况在肱二头肌近端、中部和远端区域的肌肉厚度均显著增加（p < 0.05），且两者之间无显著差异（p > 0.05）（相对变化[赫奇斯g效应量]；PREA：6%[0.51]、7%[0.49]、7%[0.53]；BAYE：9%[0.73]、9%[0.62]、9%[0.62]）以及肱肌（PREA：10%[0.72]；BAYE：8%[0.65]）。同样，最大力量也有显著提高（p < 0.05），两种情况的结果相当（PREA：28%[0.85]，BAYE：37%[1.22]；等效性检验，p值 = 0.061，0.637）。总之，对于阻力情况匹配的不同屈肘练习，肩关节角度似乎并不影响肌肉肥大和最大力量的增加。
