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Effect of resistance training with different frequencies and subsequent detraining on muscle mass and appendicular lean soft tissue, IGF-1, and testosterone in older women.
- Source :
-
European Journal of Sport Science . Mar2019, Vol. 19 Issue 2, p199-207. 9p. 2 Charts, 1 Graph. - Publication Year :
- 2019
-
Abstract
- Objective: To analyse the effect of resistance training (RT) frequency on muscle mass, appendicular lean soft tissue, insulin-like growth factor 1 (IGF-1), testosterone, and their changes with detraining in older women. Methods: Forty-five physically independent older women (≥ 60 years) were randomly assigned to perform RT either two (G2X, n = 21) or three times/week (G3X, n = 24), during 12 weeks (8 exercises, 1 set of 10-15 repetition maximum). Muscle mass and appendicular lean soft tissue, IGF-1, testosterone, and dietary intake were measured at pre-training, post-training, and after detraining (12 weeks). Results: Muscle mass and appendicular lean soft tissue significantly increased post-training (G2X = +5.5% and G3X = +5.8%, P < .0001) with no differences between groups, and gains were retained after detraining (G2X = 100% and G3X = 99%, P < .0001). IGF-1 and dietary intake did not change for the groups during the study. Testosterone did not change post-training but significantly decreased after detraining (G2X = −21% and G3X = −50%, P < .0001). Conclusion: We conclude that lower RT frequency is as effective as higher frequency to improve muscle mass and appendicular lean soft tissue, and to maintain testosterone and IGF-1. Additionally, detraining may reduce testosterone regardless of RT frequency. These results are specifically for community-dwelling older women and may not be generalized to other populations. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 17461391
- Volume :
- 19
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- European Journal of Sport Science
- Publication Type :
- Academic Journal
- Accession number :
- 134367966
- Full Text :
- https://doi.org/10.1080/17461391.2018.1496145