Abstract
BackgroundAlthough soy protein may have many health benefits derived from its associated antioxidants, many male exercisers avoid soy protein. This is due partly to a popular, but untested notion that in males, soy is inferior to whey in promoting muscle weight gain. This study provided a direct comparison between a soy product and a whey product.MethodsLean body mass gain was examined in males from a university weight training class given daily servings of micronutrient-fortified protein bars containing soy or whey protein (33 g protein/day, 9 weeks, n = 9 for each protein treatment group). Training used workouts with fairly low repetition numbers per set. A control group from the class (N = 9) did the training, but did not consume either type protein bar.ResultsBoth the soy and whey treatment groups showed a gain in lean body mass, but the training-only group did not. The whey and training only groups, but not the soy group, showed a potentially deleterious post-training effect on two antioxidant-related related parameters.ConclusionsSoy and whey protein bar products both promoted exercise training-induced lean body mass gain, but the soy had the added benefit of preserving two aspects of antioxidant function.
Highlights
Soy protein may have many health benefits derived from its associated antioxidants, many male exercisers avoid soy protein
Many male exercisers avoid soy protein because there is a perception that it is inferior to proteins like whey for supporting lean boss mass gain
Soy may help promote lean body mass gain by the antioxidants associated with soy protein
Summary
Soy protein may have many health benefits derived from its associated antioxidants, many male exercisers avoid soy protein This is due partly to a popular, but untested notion that in males, soy is inferior to whey in promoting muscle weight gain. Many male exercisers avoid soy protein because there is a perception that it is inferior to proteins like whey for supporting lean boss mass gain. Body free radical production seems to be high during exercise, and the resulting oxidant stress appears to contribute to muscle damage and fatigue [3]. This damage and fatigue could conceivably limit progress in exercise training by slowing muscle recovery between exercise workouts. This could limit lean body mass gain during an exercise program
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