Whey versus Casein Protein Supplementation on Body Composition and Resting Metabolic Rate

Whey versus Casein Protein Supplementation on Body Composition and Resting Metabolic Rate

Research shows the benefits of Whey Isolate Protein Powder (Whey) and Casein Protein Powder (Casein) supplementation in regards to body composition and resting metabolic rate; however, minimal research exists comparing Whey to Casein supplementation. Purpose: The purpose of the current study is to compare Whey versus Casein in regards to body composition and resting metabolic rate. Methods: 12 physically trained, healthy individuals (22±4.1 yrs.; 8 males; 4 females) completed a randomized two condition [Combat 100% Isolate (Whey) versus Combat 100% (Casein) intervention. The intervention consisted of subjects supplementing on either Whey or Casein in conjunction with resistance training over a 4-week period. Subjects consumed 60 grams per day. Subjects tested % body fat (BF%) utilizing the Bod Pod® and resting metabolic rate (REE) utilizing the Parvo Metabolic Cart (Parvomedics Inc., Sandy, UT) both (pre-) and (post-) intervention. Results: A 2x2, repeated-measures analysis of variance (ANOVA) demonstrated non-significant (p ≥ 0.05) effects on BF% (12.6±6.8 %. Whey pre-, 12.8±7.2 %. Whey post- vs. 14.7±6.9 %. Casein pre-, 15.5±7.1 % Casein post-), and REE (1969.3±456.4 kcal. Whey pre-, 1918.7±360.2 kcal. Whey post- vs. 1648.0±285.4 kcal. Casein pre-, 1569.6±643.5 kcal Casein post- ). Conclusion: The pilot data concludes no differences in the effects of whey versus casein on body composition and resting metabolic rate.