Leguminous seeds (pulses) are a rich source of amino acids, although they are low in the essential amino acid methionine. However, supplements of pea protein are available and they are sold as beneficial at causing muscle growth following resistance training. Whilst pea protein has been somewhat overshadowed by whey as the ideal supplemental protein for resistance training, pea protein can provide significant benefits. For example, in one study researchers administered 25 grams of pea protein, whey protein or a placebo, 2 times per day to subjects undertaking a resistance training programme. Results showed no difference in bicep muscle growth, as measured by muscle thickness, between whey and pea protein, but both produced significantly greater gains in bicep muscle thickness compared to the placebo. These results suggest that in terms of muscle growth from resistance training, pea protein may be just as beneficial as whey protein, with the added benefit that it has a lower cost.
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