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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.

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