Title

Muscle Performance, Size, And Safety Responses After Eight Weeks Of Resistance Training And Protein Supplementation: A Randomized, Double-Blinded, Placebo-Controlled Clinical Trial

Keywords

Body composition; Leucine; Muscle cross-sectional area; Strength training; Training volume; Whey protein

Abstract

The purpose of this study was to examine the effects of 2 different types of protein supplementation on thigh muscle cross-sectional area (CSA), blood markers, muscular strength, endurance, and body composition after 8 weeks of low- or moderate-volume resistance training in healthy, recreationally trained, college-aged men. One hundred and six men were randomized into 5 groups: low-volume resistance training with bioenhanced whey protein (BWPLV; n = 22), moderate-volume resistance training with BWP (BWPMV; n = 20), moderate-volume resistance training with standard whey protein (SWPMV; n = 22), moderate-volume resistance training with a placebo (PLA; n = 21), or moderate-volume resistance training with no supplementation (CON; n = 21). Except for CON, all groups consumed 1 shake before and after each exercise session and one each on the nontraining day. The BWPLV, BWPMV, and SWPMV groups received approximately 20 g of whey protein per shake, whereas the BWP groups received 5 g of additional polyethylene glycosylated (PEG) leucine. Resistance training sessions were performed 3 times per week for 8 weeks. There were no interactions (p . 0.05) for muscle strength and endurance variables, body composition, muscle CSA, and safety blood markers, but the main effects for training were observed (p # 0.05). However, the Albumin:Globulin ratio for SWPMV was lower (p = 0.037) than BWPLV and BWPMV. Relative protein intake (PROREL) indicated a significant interaction (p , 0.001) with no differences across groups at pre; however, BWPLV, BWPMV, and SWPMV had a greater intake than did PLA or CON at post (p , 0.001). This study indicated that 8 weeks of resistance training improved muscle performance and size similarly among groups regardless of supplementation. © 2013 National Strength and Conditioning Association.

Publication Date

12-2-2013

Publication Title

Journal of Strength and Conditioning Research

Volume

27

Issue

11

Number of Pages

3091-3100

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1519/JSC.0b013e31828c289f

Socpus ID

84888343497 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84888343497

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