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

Erskine, RM and Fletcher, G and Hanson, B and Folland, JP (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. ISSN 1530-0315

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Abstract

Purpose: It is unclear whether protein supplementation augments the gains in muscle strength and size observed following resistance training (RT), as limitations to previous studies include small cohorts, imprecise measures of muscle size and strength, and no control of prior exercise or habitual protein intake (HPI). 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 HPI and strength response to 3-wk RT without nutritional supplementation (followed by 6-wk 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-RM and isometric maximum voluntary force (MVF)] and size [total volume and maximum anatomical cross-sectional area (ACSAmax) determined with MRI] 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), ACSAmax (PRO, 16.2 ± 7.1% vs. PLA, 15.6 ± 4.4%; P = 0.80), 1-RM (PRO, 41.8 ± 21.2% vs. PLA, 41.4 ± 19.9%; P = 0.97) and MVF (PRO, 12.0 ± 9.9% vs. PLA, 14.5 ± 8.3%; P = 0.43). Conclusion: In the context of this study, protein supplementation did not augment elbow flexor muscle strength and size changes that occurred after 12-wk RT. Key words: Protein supplementation – strength training – muscle hypertrophy – muscle architecture – training response

Item Type: Article
Additional Information: This is a non-final version of an article published in final form in Medicine & Science in Sports & Exercise, September 2012, 44(9)1791-1800 http://dx.doi.org/10.1249/MSS.0b013e318256c48d
Uncontrolled Keywords: 1106 Human Movement And Sports Science
Subjects: R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sport & Exercise Sciences
Publisher: American College of Sports Medicine
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Date Deposited: 08 Apr 2015 14:41
Last Modified: 08 Apr 2015 14:41
DOI or Identification number: /10.1249/MSS.0b013e318256c48d
URI: http://researchonline.ljmu.ac.uk/id/eprint/861

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