Erskine et al MSSE 2012 Whey protein & RT.pdf (715 kB)

Whey protein does not enhance the adaptations to elbow flexor resistance training

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posted on 09.10.2014, 09:06 by Robert M. Erskine, Gareth Fletcher, Beth Hanson, Jonathan Folland
Purpose: It is unclear whether protein supplementation augments the gains in muscle strength and size observed after resistance training (RT) because limitations to previous studies include small cohorts, imprecise measures of muscle size and strength, and no control of prior exercise or habitual protein intake. We aimed to determine whether whey protein supplementation affected RT-induced changes in elbow flexor muscle strength and size. Methods: We pair-matched 33 previously untrained, healthy young men for their habitual protein intake and strength response to 3-wk RT without nutritional supplementation (followed by 6 wk of no training) and then randomly assigned them to protein (PRO, n = 17) or placebo (PLA, n = 16) groups. Participants subsequently performed elbow flexor RT 3 d/wk for 12 wk and consumed PRO or PLA immediately before and after each training session. We assessed elbow flexor muscle strength (unilateral 1-repetition maximum and isometric maximum voluntary force) and size (total volume and maximum anatomical cross-sectional area determined with magnetic resonance imaging) before and after the 12-wk RT. Results: PRO and PLA demonstrated similar increases in muscle volume (PRO 17.0% ± 7.1% vs PLA 14.9% ± 4.6%, P = 0.32), anatomical cross-sectional area (PRO 16.2% ± 7.1% vs PLA 15.6% ± 4.4%, P = 0.80), 1-repetition maximum (PRO 41.8% ± 21.2% vs PLA 41.4% ± 19.9%, P = 0.97), and maximum voluntary force (PRO 12.0% ± 9.9% vs PLA 14.5% ± 8.3%, P = 0.43). Conclusions: In the context of this study, protein supplementation did not augment elbow flexor muscle strength and size changes that occurred after 12 wk of RT. © 2012 by the American College of Sports Medicine.

History

School

  • Sport, Exercise and Health Sciences

Published in

Medicine and Science in Sports and Exercise

Volume

44

Issue

9

Pages

1791 - 1800

Citation

ERSKINE, R.M. ... et al, 2012. Whey protein does not enhance the adaptations to elbow flexor resistance training. Medicine and Science in Sports and Exercise, 44 (9), pp.1791-1800.

Publisher

© The American College of Sports Medicine

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2012

Notes

This is a non-final version of an article published in final form at: http://dx.doi.org/10.1249/MSS.0b013e318256c48d

ISSN

0195-9131

eISSN

1530-0315

Language

en

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Keywords

Exports