We aimed to compare the effects of periodic resistance training (RT) and continuous RT on muscle strength and size. Fifty‐five healthy, untrained participants (age 32 ± 5 years) were randomized to periodic (PRT, n = 20 completed the study, 45% females) or continuous (CRT, n = 22 completed the study, 45% females) groups. PRT completed a 10‐week RT, a 10‐week detraining, and a second identical 10‐week RT. CRT began with a 10‐week non‐RT, followed by a 20‐week RT. RT included twice‐weekly supervised whole‐body RT sessions. Leg press (LP) and biceps curl (BC) one repetition maximum (1RM), countermovement jump (CMJ) height, muscle cross‐sectional area (CSA) of vastus lateralis (VL), and biceps brachii (BB) using ultrasound imaging were measured twice at the beginning and every fifth week during the intervention. Both groups increased (p < 0.001) 1RM in LP and BC, CSA in VL and BB, and CMJ height with no differences between the groups. In PRT, 1RM in LP and BC, CSA in VL and BB, and CMJ height decreased during detraining (p < 0.05). During the first 5 weeks of retraining in PRT, increases in LP 1RM, and VL and BB CSA were greater than in CRT during Weeks 10–15 of their CRT (p < 0.01). PRT and CTR ended up in similar postintervention adaptations, as decreased muscle strength and size during detraining in PRT regained rapidly during retraining. Our results therefore suggest that trainees should not be too concerned about occasional short‐term training breaks in their daily lives when it comes to lifelong strength training.Trial Registration: ClinicalTrials.gov identifier: NCT05553769

中文翻译：

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休息重要吗 - 在持续和定期阻力训练之间肌肉力量和大小的调整


我们旨在比较定期阻力训练 （RT） 和持续 RT 对肌肉力量和大小的影响。55 名健康、未经训练的参与者 （年龄 32 ± 5 岁） 被随机分配到定期 （PRT，n = 20 完成研究，45% 女性） 或连续 （CRT，n = 22 完成研究，45% 女性） 组。PRT 完成了 10 周的 RT、10 周的停止训练和第二次相同的 10 周 RT。CRT 从 10 周的非 RT 开始，然后是 20 周的 RT。在干预开始时和干预期间每五周使用超声成像测量两次腿部推举 （LP） 和二头肌弯举 （BC） 一次最大重复次数 （1RM）、反向运动跳跃 （CMJ） 高度、股外侧肌 （VL） 肌肉横截面积 （CSA） 和肱二头肌 （BB）。两组 LP 和 BC 均增加 （p < 0.001） 1RM，VL 和 BB 增加 CSA，CMJ 身高增加，组间无差异。在 PRT 中，LP 和 BC 为 1RM，VL 和 BB 为 CSA，CMJ 高度在训练过程中降低 （p < 0.05）。在 PRT 再训练的前 5 周内，LP 1RM 以及 VL 和 BB CSA 的增加在 CRT 的第 10-15 周内大于 CRT （p < 0.01）。PRT 和 CTR 最终发生了类似的干预后适应，因为 PRT 中停止训练时肌肉力量和大小的减少在再训练期间迅速恢复。因此，我们的结果表明，当涉及到终身力量训练时，受训者不应该太担心日常生活中偶尔的短期训练中断。试用注册：ClinicalTrials.gov 标识符：NCT05553769