Short-time resistance training enhances sleep quality in obese and non-obese young women.
Study Goal
The researchers aimed to examine the effects of short-term resistance training on sleep quantity and quality in young women, stratified by body fat levels.
Results Summary
Six weeks of resistance training improved subjective sleep quality and reduced sleep disturbances in young women, regardless of fat mass. No significant correlations were found between sleep quality and changes in body composition.
Population
Young women (n=35) categorized by body fat levels (obese vs. non-obese).
Effective Dosage
Progressive six-week full-body resistance training (specific dosage not detailed).
Duration
Six weeks.
Interactions
None mentioned.
| Intervention | Direction | Endpoint | Population | Dosage | Impact | Claim # |
|---|---|---|---|---|---|---|
six-week full-body resistance training | decrease | overall sleep score | young women | - | showed a reduction | #1 |
six-week full-body resistance training | increase | subjective sleep quality | young women | - | improvement | #2 |
six-week full-body resistance training | decrease | sleep disturbances | young women | - | a decrease | #3 |
six-week full-body resistance training | no change | sleep parameters | young women | - | no interaction | #4 |
six-week full-body resistance training | no change | body composition | young women | - | no interaction | #5 |
- | no change | sleep quality | young women | - | no significant correlations | #6 |
- | no change | fat mass | young women | - | no significant correlations | #7 |
- | no change | fat-free mass | young women | - | no significant correlations | #8 |
PURPOSE: The purpose of this study was to examine the effects of short-term resistance training on sleep quantity and quality in young women, according to their body fat. METHODS: Thirty-five young women were randomly assigned based on their body fat levels, using the 90th percentile of fat mass as a criterion, with a threshold set at ≥ 21 kg of fat mass for the obese group (n = 16) and < 21 kg of fat mass for the non-obese group (n = 19). Subjective sleep quality was evaluated using the Pittsburgh Sleep Quality Index (PSQI) at pre and post a progressive six-week full-body resistance training (RT). RESULTS: Post-intervention analysis showed a reduction in the overall sleep score (p = 0.006, η2 = 0.21), improvement in subjective sleep quality (p < 0.001; η2 = 0.357) and a decrease in sleep disturbances (p = 0.034; η2 = 0.129). However, no interaction between group x training for sleep parameters and body composition was observed (p > 0.05). There were no significant correlations between sleep quality, fat mass and fat-free mass in both groups investigated (p > 0.05). CONCLUSION: Six-weeks of RT improved subjective sleep quality and reduced sleep disturbances in young women, regardless of the amount of fat mass. Sleep variables were not associated with changes in body composition.