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
Notes for this study:
||Bench press 1REPmax. SMD Versus whey: Soy: 2.04 (1.22, 2.85 95% CI). Whey 2.12 (1.22, 3.01). Versus animal protein: Soy: 1.43 (0.81, 2.05) Animal protein in general 1.50 (0.83, 2.16). 1Repmax squat/leg press. Soy versus whey. Soy: 3.54 (2.42), 4.7) Whey: 3.16 (2.06, 4.25). Versus animal protein in general. Soy: 1.57 (1.00, 2.13) Animal: 1.22 (0.70, 1.75)
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The study was a meta-analysis of randomized, controlled trials investigating the effects of soy protein on lean body mass and strength compared with that of animal protein. Studies were at least 6 weeks in duration, with training at least twice per week.
Funding issues for this study:
9 studies were included in the quantitative analysis. As measured by bench press 1-rep max, strength didn't see a statistically significant difference compared with whey protein controls across 3 such studies, and neither did it for squat/leg press or lean body mass. There were no significant or meaningful differences for all sources of animal protein for these measures either, across 9 studies for lean mass and 6 for each strength measure, respectively.
"M. Messina is the executive director of the Soy Nutrition Institute, an organization that is partially funded by the soy industry."