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No Difference Between the Effects of Supplementing With Soy Protein Versus Animal Protein on Gains in Muscle Mass and Strength in Response to Resistance Exercise

Messina, Mark and Lynch, Heidi and Dickinson, Jared and Reed, Katharine E (2018) 'No Difference Between the Effects of Supplementing With Soy Protein Versus Animal Protein on Gains in Muscle Mass and Strength in Response to Resistance Exercise.' International Journal of Sport Nutrition and Exercise Metabolism, 28 (6). 674 - 685. ISSN 1526-484X

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Abstract

Much attention has been given to determining the influence of total protein intake and protein source on gains in lean body mass (LBM) and strength in response to resistance exercise training (RET). Acute studies indicate that whey protein, likely related to its higher leucine content, stimulates muscle protein synthesis (MPS) to a greater extent than proteins such as soy and casein. Less clear is the extent to which the type of protein supplemented impacts strength and LBM in longer term studies (≥6 weeks). Therefore, a meta-analysis was conducted to compare the effect of supplementation with soy protein to animal protein supplementation on strength and LBM in response to RET. Nine studies involving 266 participants suitable for inclusion in the meta-analysis were identified. Five studies compared whey with soy protein and four compared soy protein with other proteins (beef, milk or dairy protein). Meta-analysis showed that supplementing RET with whey or soy protein resulted in significant increases in strength but found no difference between groups (bench press Chi2 = 0.02, p=0.90; squat Chi2=0.22, p =0.64). There was no significant effect of whey or soy alone (n=5) on LBM change, and no differences between groups (Chi2=0.00, p=0.96). Strength and LBM both increased significantly in the ‘other protein’ and the soy groups (n=9), but there were no between group differences (bench Chi2=0.02, p=0.88; squat Chi2=0.78, p=0.38 and LBM Chi2=0.06, p=0.80). The results of this meta-analysis indicate that soy protein supplementation produces similar gains in strength and LBM in response to RET as whey protein.

Item Type: Article
Uncontrolled Keywords: Animal protein, soy protein, lean body mass
Subjects: R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Faculty of Science and Health > Sport, Rehabilitation and Exercise Sciences, School of
Depositing User: Elements
Date Deposited: 07 Jun 2018 10:39
Last Modified: 06 Jan 2020 16:15
URI: http://repository.essex.ac.uk/id/eprint/22103

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