Are increases in skeletal muscle mass accompanied by changes to resting metabolic rate in rugby athletes over a pre-season training period?

Kristen L MacKenzie-Shalders; Nuala M Byrne; Neil A King; Gary J Slater

doi:10.1080/17461391.2018.1561951

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Are increases in skeletal muscle mass accompanied by changes to resting metabolic rate in rugby athletes over a pre-season training period?

Journal article

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Are increases in skeletal muscle mass accompanied by changes to resting metabolic rate in rugby athletes over a pre-season training period?

Kristen L MacKenzie-Shalders, Nuala M Byrne, Neil A King and Gary J Slater

European Journal of Sport Science, Vol.19(7), pp.885-892

2019

DOI: https://doi.org/10.1080/17461391.2018.1561951

PMID: 30614386

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Abstract

metabolism

nutrition

measurement

prediction

team sport

Optimising dietary energy intake is essential for effective sports nutrition practice in rugby athletes. Effective dietary energy prescription requires careful consideration of athletes' daily energy expenditure with the accurate prediction of resting metabolic rate (RMR) important due to its influence on total energy expenditure and in turn, energy balance. This study aimed to (a) measure rugby athletes RMR and (b) report the change in RMR in developing elite rugby players over a rugby preseason subsequent to changes in body composition and (c) explore the accurate prediction of RMR in rugby athletes. Eighteen developing elite rugby union athletes (age 20.2±1.7 years, body mass 101.2±14.5 kg, stature 184.0±8.4 cm) had RMR (indirect calorimetry) and body composition (dual energy x-ray absorptiometry) measured at the start and end of a rugby preseason ∼14 weeks later. There was no statistically significant difference in RMR over the preseason period (baseline 2389±263 kcal.day-1 post 2373±270 kcal.day-1) despite a significant increase in lean mass of +2.0±1.6 kg (P < 0.01) and non-significant loss of fat mass. The change in RMR was non-significant and non-meaningful; thus, this study contradicts the commonly held anecdotal perception that an increase in skeletal muscle mass will result in a significant increase in metabolic rate and daily energy needs. Conventional prediction equations generally under-estimated rugby athletes' measured RMR, and may be problematic for identifying low energy availability, and thus updated population-specific prediction equations may be warranted to inform practice.

Details

Title: Are increases in skeletal muscle mass accompanied by changes to resting metabolic rate in rugby athletes over a pre-season training period?
Authors: Kristen L MacKenzie-Shalders (Author) - Bond University
Nuala M Byrne (Author) - University of Tasmania
Neil A King (Author) - Queensland University of Technology
Gary J Slater (Author) - University of the Sunshine Coast - School of Health & and Sport Sciences
Publication details: European Journal of Sport Science, Vol.19(7), pp.885-892
Publisher: Taylor & Francis Ltd.
Date published: 2019
DOI: 10.1080/17461391.2018.1561951
ISSN: 1746-1391
PMID: 30614386
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: 99451426702621
Output Type: Journal article

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Collaboration types: Domestic collaboration
Web Of Science research areas: Sport Sciences