Periodized and non-periodized resistance training programs on body composition and physical function of older women

Background and purpose: Although combining classical resistance (RT) and power training (PT) might be an efficient strategy to achieve optimal enhancements in body composition and physical function in older adults, the most effective approach to combine these different types of exercise training is still unknown. Periodization, an organizational model that refers to a succession of cycle that will vary in exercise intensity and/or volume to allow for the training stimulus to remain biologically challenging and effective, may represent an interesting approach. Among the different types of periodization, daily undulating periodization (DUP) has attracted considerable attention given its superiority in comparison to nonperiodized (NP) RT programs to elicit neuromuscular improvements in young adults. However, whether a DUP program combining PT and traditional RT can produce similar or greater improvements in body composition and physical function in older adults than a NP RT program has not yet been established. Therefore, the present study compared the effects of a DUP and NP programs on body composition and physical function in healthy community-dwelling older women. Methods: Forty-two older women (60-79 years) were randomized into one of the three experimental groups: NP, DUP, and control group (CG). Body composition and physical function were assessed at baseline and after the intervention. The sessions of exercises were performed twice a week over 22 weeks. In NP, the two exercise sessions were based on three sets of 8-10 repetitions at a "difficult" intensity (i.e., 5-6) prescribed based on the Rating of Perceived Exertion (RPE) scale. In DUP, the first session was based on PT (three sets of 8-10 repetitions at a "moderate" intensity, i.e., 3, performed as fast as possible), while the second session was similar to the NP. Results: There were no significant changes in body composition in any of the groups. Relative to baseline, participants assigned to NP showed significant improvements in countermovement jump ( + 55.7%), timed "Up and Go" (TUG) test (- 43.2%, faster), walking speed ( + 12.0%), and one-leg-stand ( +154.5%). In contrast, DUP only improved TUG performance ( - 53.2%, faster). Conclusion: NP and DUP improved physical function in community-dwelling older women, with greater improvements in physical parameters only observed after NP.