Physiological implications of preparing for a natural male bodybuilding competition

European Journal of Sport Science
Lachlan MitchellHelen O'connor

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,...Continue Reading

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Citations

Sep 25, 2018·Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme·Wilson Max Almeida Monteiro de MoraesJonato Prestes
May 30, 2019·International Journal of Sport Nutrition and Exercise Metabolism·Nura AlwanKevin Enright
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Aug 24, 2019·Journal of the International Society of Sports Nutrition·A J ChappellE Helms
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Nov 22, 2020·Sports·Ragami C AlvesTacito P Souza-Junior
May 25, 2021·Clinical Nutrition ESPEN·Ronaldo Ferreira MouraJonato Prestes
Jun 15, 2021·BMC Sports Science, Medicine and Rehabilitation·Guillermo EscalanteBrad J Schoenfeld
Aug 18, 2021·Journal of Human Kinetics·Andrew J ChappellEric R Helms
Nov 14, 2020·Clinical Nutrition ESPEN·Rodrigo C O MacedoAlvaro Reischak-Oliveira

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Methods Mentioned

BETA
X-ray

Software Mentioned

enCORE
FoodWorks
Xyris
SPSS

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