Physiological implications of preparing for a natural male bodybuilding competition

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Title: Physiological implications of preparing for a natural male bodybuilding competition
Author/Creator: Mitchell, Lachlan | Slater, G J | Hackett, Daniel | Johnson, Nathan | O'Connor, Helen
Description: 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.
Relation: European Journal of Sport Science / Vol. 18, No. 5, pp.619-629
Relation: http://dx.doi.org/10.1080/17461391.2018.1444095
Year: 2018
Publisher: Taylor & Francis Ltd.
Subject: FoR 0913 (Mechanical Engineering) | FoR 1106 (Human Movement and Sports Science) | lean mass | fat mass | resting metabolic rate | protein | hormones | body composition

Resource Type: Journal Article
Identifier: ISSN: 1746-1391
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