Effects of Consecutive Versus Non-consecutive Days of Resistance Training on Strength, Body Composition, and Red Blood Cells

Frontiers in Physiology

Jorming Goh²  Pang B. Bay³  Junli Huang³  Hilary W. J. Teo³  Yifan Yang³  Yongtai R. Wang³ 

[1] Combat Protection and Performance Program, DSO National Laboratories, Singapore, Singapore;Department of Physiology, National University of Singapore, Singapore, Singapore;Physical Education and Sports Science, National Institute of Education, Nanyang Technological University, Singapore, Singapore;

关键词: resistance training;    recovery period;    muscle strength;    muscle mass;    bone mineral density;    fat loss;   

DOI  :  10.3389/fphys.2018.00725

来源: DOAJ

【 摘 要 】

Health authorities worldwide recommend 2–3 days per week of resistance training (RT) performed ∼48–72 h apart. However, the influence of recovery period between RT sessions on muscle strength, body composition, and red blood cells (RBCs) are unclear.Aim: Examine the effects of three consecutive (C) or non-consecutive (NC) days of RT per week for 12 weeks on strength, body composition, and RBCs.Methods: Thirty young, healthy and recreationally active males were randomly assigned to 3 C (∼24 h between sessions) or NC (∼48–72 h between sessions) days of RT per week for 12 weeks. Both groups performed three sets of 10 repetitions at 10-repetition maximum (RM) of leg press, latissimus pulldown, leg curl, shoulder press, and leg extension for each session. Ten RM and body composition were assessed pre- and post-RT. RBC parameters were measured on the first session before RT, and 0 and 24 h post-3rd session in untrained (week 1) and trained (week 12) states.Results: No training × group interaction was found for all strength and body composition parameters (p = 0.075–0.974). Training increased strength for all exercises, bone mineral density, and total body mass via increased lean and bone mass (p < 0.001). There was no interaction (p = 0.076–0.994) and RT induced temporal changes in all RBC parameters (p < 0.001–0.003) except RBC corrected for plasma volume changes (time × training interaction; p = 0.001). Training increased hematocrit and lowered mean corpuscular hemoglobin and mean corpuscular hemoglobin concentration (p = 0.001–0.041) but did not alter uncorrected RBC, hemoglobin, mean corpuscular volume and RBC distribution width (p = 0.178–0.797).Conclusion: Both C and NC RT induced similar improvements in strength and body composition, and changes in RBC parameters.

【 授权许可】

Unknown