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Bone mineral density
Yang, Y., Bay, P. B., Wang, Y. R., Huang, J., Teo, H. W. J., & Goh, J. (2018). Effects of consecutive versus non-consecutive days of resistance training on strength, body composition, and red blood cells. Frontiers in Physiology, 9. https://doi.org/10.3389/fphys.2018.00725
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 D 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 D 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 D 0.001). Training increased hematocrit and lowered mean corpuscular hemoglobin and mean corpuscular hemoglobin concentration (p D 0.001–0.041) but did not alter uncorrected RBC, hemoglobin, mean corpuscular volume and RBC distribution width (p D 0.178–0.797).
Conclusion: Both C and NC RT induced similar improvements in strength and body composition, and changes in RBC parameters.
RI 5/14 YYF
NIE Academic Research Fund
National Institute of Education, Singapore
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checked on Aug 15, 2022
checked on Aug 15, 2022
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