Song Jun Seob, Kataoka Ryo, Yamada Yujiro, Hammert William B, Kang Anna, Wong Vickie, Spitz Robert W, Seffrin Aldo, Kassiano Witalo, Loenneke Jeremy P
Texas A&M University-San Antonio.
The University of Mississippi.
Res Q Exerc Sport. 2025 Jul 14:1-9. doi: 10.1080/02701367.2025.2528821.
To investigate whether unilateral resistance training can enhance absolute and relative muscular endurance in a trained arm and an untrained arm (cross-education of muscular endurance), and if this is mediated by increases in strength. 160 participants were randomly assigned to one of four groups: 1) training on the dominant arm followed by non-dominant arm (D + ND), 2) training on the dominant arm (D-Only), 3) training on the non-dominant arm (ND-Only), and 4) a time-matched non-exercise control (Control). Training involved 6-week (x3/week) of elbow flexion exercise. Each training session started with 1RM training (≤five attempts), followed by four sets of high-load exercise (8-12RM). Changes in muscular endurance and 1RM strength of the non-dominant arm were compared among groups. Mediation analysis was used to investigate the influence of 1RM strength changes on muscular endurance. Changes in absolute muscular endurance of the non-dominant arm were greatest in D + ND (10.7 reps) and ND-Only (10.1 reps), while the changes were greater in D-Only (4.9 reps) when compared to Control (1.2 reps). Changes in relative muscular endurance of the non-dominant arm were only observed in D + ND (1.6 reps) and ND-Only (2.0 reps). Increased 1RM strength positively mediated the changes in absolute muscular endurance, whereas it negatively mediated the changes in relative muscular endurance. Unilateral high-load resistance training increased absolute muscular endurance in both a trained and untrained arm, likely driven by increased strength. In contrast, no cross-education of relative muscular endurance was observed.
为了研究单侧阻力训练是否能增强训练侧手臂和未训练侧手臂的绝对和相对肌肉耐力（肌肉耐力的交叉训练效应），以及这是否由力量增加所介导。160名参与者被随机分配到四组中的一组：1）先训练优势手臂，然后训练非优势手臂（D + ND），2）仅训练优势手臂（仅D组），3）仅训练非优势手臂（仅ND组），4）时间匹配的非运动对照组（对照组）。训练包括6周（每周3次）的肘部屈曲运动。每次训练开始时进行1RM训练（≤5次尝试），随后进行四组高负荷运动（8 - 12RM）。比较各组非优势手臂肌肉耐力和1RM力量的变化。采用中介分析来研究1RM力量变化对肌肉耐力的影响。非优势手臂的绝对肌肉耐力变化在D + ND组（10.7次重复）和仅ND组（10.1次重复）中最大，而与对照组（1.2次重复）相比，仅D组（4.9次重复）的变化更大。非优势手臂的相对肌肉耐力变化仅在D + ND组（1.6次重复）和仅ND组（2.0次重复）中观察到。1RM力量增加对绝对肌肉耐力变化起到正向中介作用，而对相对肌肉耐力变化起到负向中介作用。单侧高负荷阻力训练增加了训练侧和未训练侧手臂的绝对肌肉耐力，可能是由力量增加驱动的。相比之下，未观察到相对肌肉耐力的交叉训练效应。
