Studies related to Strength and Soy Protein

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

Effect None
Values 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)
Trial Design Randomized trial
Trial Length n/a
Number of Subjects 0
Sex n/a
Body Types Trained
Notes for this study:
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.

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.
Funding issues for this study:
"M. Messina is the executive director of the Soy Nutrition Institute, an organization that is partially funded by the soy industry."