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<p>The present study aimed to investigate the acute changes in muscle thickness (i.e., muscle swelling; Experiment 1) and chronic responses (i.e., muscle hypertrophy; Experiment 2) along the elbow flexor length (biceps brachii and brachialis together) after the dumbbell curl (DC) versus the dumbbell row (DR) exercises. For Experiment 1, 16 trained men completed a training session (4 × 8-12RM). For Experiment 2, nine untrained men underwent a resistance training program (8 wk; 2x/wk; 4-6 × 8-12RM). Both experiments followed a within-subject experimental design, in which each subject performed DC or DR for each upper limb. Panoramic ultrasound images of the elbow flexors (biceps brachii + brachialis) were captured before and immediately after the session (Experiment 1) or 72&#xa0;h after the last training program session (Experiment 2). Muscle thickness (MT) was measured at proximal (25%) and distal (75%) regions of the biceps brachii length. After the acute training session, DC induced greater changes in elbow flexors MT (proximal = 19%; distal = 16%) than DR (proximal = 13%; distal = 12%), with a statistically significant difference between exercises for the proximal region (<i>p</i> = 0.024). After the 8-week training program, DC evoked regional hypertrophy (proximal = 5%; distal = 11%) and greater changes than DR, which showed increases only in the proximal region (5%) but not in the distal region (1%). Greater acute and chronic increases in MT were revealed for the DC exercise, but with different regional responses.</p>

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Acute and chronic regional changes in elbow flexor thickness after resistance training with dumbbell curl or dumbbell row exercises

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Bruno F. M. Leitão,
  • José C. S. Albarello,
  • Gustavo H. Halmenschlager,
  • Pietro Mannarino,
  • João P. Nunes,
  • Belmiro F. De Salles,
  • Thiago T. Matta

摘要

The present study aimed to investigate the acute changes in muscle thickness (i.e., muscle swelling; Experiment 1) and chronic responses (i.e., muscle hypertrophy; Experiment 2) along the elbow flexor length (biceps brachii and brachialis together) after the dumbbell curl (DC) versus the dumbbell row (DR) exercises. For Experiment 1, 16 trained men completed a training session (4 × 8-12RM). For Experiment 2, nine untrained men underwent a resistance training program (8 wk; 2x/wk; 4-6 × 8-12RM). Both experiments followed a within-subject experimental design, in which each subject performed DC or DR for each upper limb. Panoramic ultrasound images of the elbow flexors (biceps brachii + brachialis) were captured before and immediately after the session (Experiment 1) or 72 h after the last training program session (Experiment 2). Muscle thickness (MT) was measured at proximal (25%) and distal (75%) regions of the biceps brachii length. After the acute training session, DC induced greater changes in elbow flexors MT (proximal = 19%; distal = 16%) than DR (proximal = 13%; distal = 12%), with a statistically significant difference between exercises for the proximal region (p = 0.024). After the 8-week training program, DC evoked regional hypertrophy (proximal = 5%; distal = 11%) and greater changes than DR, which showed increases only in the proximal region (5%) but not in the distal region (1%). Greater acute and chronic increases in MT were revealed for the DC exercise, but with different regional responses.