Does Taking a Break Matter : Adaptations in Muscle Strength and Size Between Continuous and Periodic Resistance Training
Halonen, Eeli J., Gabriel, I., Kelahaara, Milla M., Ahtiainen, Juha P., & Hulmi, Juha J. (2024). Does Taking a Break Matter : Adaptations in Muscle Strength and Size Between Continuous and Periodic Resistance Training. Scandinavian Journal of Medicine and Science in Sports, 34(10), Article e14739. https://doi.org/10.1111/sms.14739
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2024Copyright
© 2024 The Author(s). Scandinavian Journal of Medicine & Science In Sports published by John Wiley & Sons Ltd
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.
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Academy Project, AoFAdditional information about funding
This research received funding from the Rehabilitation Foundation Peurunka and Suomen Urheilututkimussäätiö, and J.P.A. was funded by the Research Council of Finland, grant number 357185.License
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