Journal article
Physiological implications of preparing for a natural male bodybuilding competition
European Journal of Sport Science, Vol.18(5), pp.619-629
2018
PMID: 29490578
Abstract
This study aimed to describe the body composition and physiological changes which take place during the in-season and recovery periods of a group of natural bodybuilders. Natural male bodybuilders (n= 9) were assessed 16 (PRE16), 8 (PRE8), and 1 (PRE1) week(s) before, and 4 (POST4) weeks after a bodybuilding competition. Assessments included body composition, resting metabolic rate (RMR), serum hormones, and 7-day weighed food and training diaries. Change in parameters was assessed using repeated-measures analysis of variance. Dietary protein intake remained high throughout the study period (2.8-3.1 g kg-1 d-1). Fat mass (FM) was significantly reduced from PRE16 to PRE1 (8.8±3.1 vs. 5.3±2.4 kg, P < .01). There was a small decrease in lean mass (LM) from PRE8 to PRE1 (71.8±9.1 vs. 70.9±9.1 kg, P < .05). No changes in RMR were observed (P > .05). Large reductions in total and free testosterone (16.4±4.4 vs. 10.1±3.6 nmol L-1, P < .05; 229.3±72.4 vs. 116.8±76.9 pmol L-1, P < .05), and insulin-like growth factor-1 (IGF-1) (27.0±7.7 vs. 19.9±7.6 nmol L-1, P < .05) occurred between PRE16 and PRE1. LM and IGF-1 increased from PRE1 to POST4 (70.9±9.1 vs. 72.5±8.5 kg, P < .05; 19.9±7.6 vs. 25.4±9.3 nmol L-1, P < .05). Despite substantial reductions in FM, participants maintained almost all of their LM. The reduction in anabolic hormone concentration is likely attributable to the prolonged negative energy balance, despite a high dietary protein intake.
Details
- Title
- Physiological implications of preparing for a natural male bodybuilding competition
- Authors
- Lachlan Mitchell (Author) - University of SydneyGary J Slater (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and EngineeringDaniel Hackett (Author) - University of SydneyNathan Johnson (Author) - University of SydneyHelen O'Connor (Author) - University of Sydney
- Publication details
- European Journal of Sport Science, Vol.18(5), pp.619-629
- Publisher
- Taylor & Francis Ltd.
- Date published
- 2018
- DOI
- 10.1080/17461391.2018.1444095
- ISSN
- 1746-1391
- PMID
- 29490578
- Organisation Unit
- University of the Sunshine Coast, Queensland; School of Health - Nutrition & Dietetics; School of Health and Sport Sciences - Legacy; School of Health and Behavioural Sciences - Legacy
- Language
- English
- Record Identifier
- 99450897002621
- Output Type
- Journal article
Metrics
311 Record Views
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- Collaboration types
- Domestic collaboration
- Web Of Science research areas
- Sport Sciences