A hypoenergetic diet with decreased protein intake does not reduce lean body mass in trained females
- PDF / 900,666 Bytes
- 11 Pages / 595.276 x 790.866 pts Page_size
- 75 Downloads / 182 Views
ORIGINAL ARTICLE
A hypoenergetic diet with decreased protein intake does not reduce lean body mass in trained females Alice G. Pearson1 · Lee Alexander2 · Oliver C. Witard3 · Thomas E. Coughlin2 · Kevin D. Tipton1 · Ian H. Walshe4 Received: 26 May 2020 / Accepted: 7 November 2020 © The Author(s) 2020
Abstract Purpose Increasing protein intake during energy restriction (ER) attenuates lean body mass (LBM) loss in trained males. However, whether this relationship exists in trained females is unknown. This study examined the impact of higher compared to lower protein intakes (35% versus 15% of energy intake) on body composition in trained females during 2 weeks of severe ER. Methods Eighteen well-trained females completed a 1-week energy balanced diet (HD100), followed by a 2-week hypoenergetic (40% ER) diet (HD60). During HD60, participants consumed either a high protein (HP; 35% protein, 15% fat) or lower protein (CON; 15% protein, 35% fat) diet. Body composition, peak power, leg strength, sprint time, and anaerobic endurance were assessed at baseline, pre-HD60, and post-HD60. Results Absolute protein intake was reduced during HD60 in the CON group (from 1.6 to 0.9 g·d·kgBM−1) and maintained in the HP group (~ 1.7 g·d·kgBM−1). CON and HP groups decreased body mass equally during HD60 (− 1.0 ± 1.1 kg; p = 0.026 and − 1.1 ± 0.7 kg; p = 0.002, respectively) and maintained LBM. There were no interactions between time point and dietary condition on exercise performance. Conclusion The preservation of LBM during HD60, irrespective of whether absolute protein intake is maintained or reduced, contrasts with findings in trained males. In trained females, the relationship between absolute protein intake and LBM change during ER warrants further investigation. Future recommendations for protein intake during ER should be expressed relative to body mass, not total energy intake, in trained females. Keywords Energy restriction · Weight loss · Body composition · Diet composition Abbreviations ANOVA Analysis of variance BM Body mass CON Control FM Fat mass HD60 Habitual diet at 60% of energy requirements Communicated by Kirsty Elliott-Sale. * Ian H. Walshe [email protected] 1
Department of Sport and Exercise Sciences, Durham University, Durham, UK
2
Physiology, Exercise and Nutrition Research Group, University of Stirling, Stirling, UK
3
Centre of Human and Applied Physiological Research, King’s College London, London, UK
4
Department of Sport, Exercise and Rehabilitation, Northumbria University, Newcastle, UK
HD100 Habitual diet at 100% of energy requirements HP High protein LBM Lean body mass MPB Muscle protein breakdown MPS Muscle protein synthesis
Introduction Many athletes employ weight loss strategies to enhance body composition and achieve health or performance goals. In particular, weight class sports, such as mixed-martialarts and weightlifting (Barley et al. 2018; da Silva Santos et al. 2016; Matthews and Nicholas 2017), or those with an aesthetic component, such as body bu
Data Loading...
