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| Effects of different resistance training systems on muscular strength and hypertrophy in resistance-trained older women [with consumer summary] |
| Ribeiro AS, Aguiar AF, Schoenfeld BJ, Nunes JP, Cavalcante EF, Cadore EL, Cyrino ES |
| Journal of Strength & Conditioning Research 2018 Feb;32(2):545-553 |
| clinical trial |
| 5/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: No; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: Yes; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed* |
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The purpose of this study was to investigate the effect of resistance training (RT) performed in a pyramid (PR) versus constant (CT) load system on muscular strength and hypertrophy in resistance-trained older women. Thirty-three older women (69.7 +/- 5.9 years, 69.1 +/- 15.0 kg, 156.6 +/- 6.2 cm, and 28.1 +/- 5.4 kg/m2) were randomized into 2 groups: one that performed RT with a CT load (n = 16) and another group that performed RT in an ascending PR fashion (n = 17). Outcomes included 1 repetition maximum (RM) tests and assessment of skeletal muscle mass estimated by dual-energy x-ray absorptiometry. The study lasted 32 weeks, with 24 weeks dedicated to preconditioning and 8 weeks for the actual experiment. The RT program was conducted 3 d/wk; the CT consisted of 3 sets of 8 to 12RM with same load across sets, whereas the PR consisted of 3 sets of 12/10/8RM with incremental loads for each set. A significant (p <= 0.05) change from pretraining to posttraining was observed for chest press total strength (CT pre 122.8 +/- 21.0 kg, post 128.9 +/- 21.4 kg, effect size (ES) 0.28; PR pre 120.5 +/- 22.8 kg, post 125.8 +/- 22.9 kg, ES 0.24) and muscle mass (CT pre 21.4 +/- 3.6 kg, post 21.7 +/- 3.5 kg, ES 0.09; PR pre 20.9 +/- 3.4 kg, post 21.1 +/- 3.4 kg, ES 0.06) without differences between groups. Results suggest that both systems are effective to improve strength and muscle growth, but PR is not superior to CT for inducing improvements in previously trained older women.
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