Effects of whey isolate, creatine and resistance training on muscle hypertrophy

1441 659 1042 8 16308 document 1042 MSSE2007a_(3).pdf application/pdf 421450 2011-09-09 10:21:40 https://vuir.vu.edu.au/1441/1/MSSE2007a_%283%29.pdf 1441 1 application/pdf text en public

MSSE2007a_(3).pdf

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http://eprints.org/relation/isVersionOf https://vuir.vu.edu.au/id/document/1042 http://eprints.org/relation/isVolatileVersionOf https://vuir.vu.edu.au/id/document/1042 http://eprints.org/relation/issmallThumbnailVersionOf https://vuir.vu.edu.au/id/document/1042 archive 292 disk0/00/00/14/41 2008-10-28 23:05:25 2021-08-27 13:58:17 2008-10-28 23:05:25 article show Cribb Paul J Williams Andrew D Stathis Christos 0000-0003-0064-9523 Carey Michael F Hayes Alan 0000-0003-1398-3694 Effects of whey isolate, creatine and resistance training on muscle hypertrophy pub 320000 BiomedicalSciences protein supplementation, histochemistry, skeletal muscle strength, fiber area, contractile protein PURPOSE: Studies that have attributed gains in lean body mass to dietary supplementation during RE training have not reported these changes alongside adaptations at the cellular and sub-cellular levels. Therefore, the purpose of this study was to examine the effects of two popular supplements; whey protein (WP) and creatine monohydrate (CrM) (both separately and in combination) on body composition, muscle strength, fiber-specific hypertrophy (i.e., type-I, IIa, IIx) and contractile protein accrual during RE training. METHODS: In a double-blind, randomized protocol, resistance-trained males were matched for strength and placed into one of four groups: creatine/carbohydrate (CrCHO), creatine/whey protein (CrWP), WP-only or carbohydrate–only (CHO) (1.5g/kg body wt/day). All assessments were completed the week before and after an 11 week structured, supervised RE program. Assessments included strength (1RM, three exercises), body composition (DEXA) and vastus lateralis muscle biopsies for determination of muscle fiber type (I, IIa, IIx), cross-sectional area (CSA), contractile protein and creatine (Cr) content. RESULTS: Supplementation with CrCHO, WP and CrWP resulted in significantly greater (P < 0.05) 1RM strength improvements (three of three assessments) and muscle hypertrophy compared to CHO. Up to 76% of the strength improvements in the squat could be attributed to hypertrophy of muscle involved in this exercise. However, the hypertrophy responses within these groups varied at the three levels assessed (i.e., changes in lean mass, fiber-specific hypertrophy and contractile protein content). CONCLUSIONS: Although WP and/or CrM appear to promote greater strength gains and muscle morphology during RE training, the hypertrophy responses within the groups varied. These differences in skeletal muscle morphology may have important implications for various populations and therefore, warrant further investigation. 2007-02 published Lippincott, Williams & Wilkins public Medicine & Science in Sports & Exercise 39 2 298-307 TRUE 1530-0315, 0195-9131 http://www.lww.com/index.html pub Includes bibliographical references: pp. 21-25 FALSE 103 2-s2.0-33846820382 2023-07-02 04:00:18