This study examined the effects of ingesting nutritional supplements designed to promote lean tissue accretion on body composition alterations during resistance training. Twenty-eight resistance-trained males blindly supplemented their diets with maltodextrin (M), Gainers Fuel® 1000 (GF), or Phosphagain™ (P). No significant differences were observed in absolute or relative total body water among groups. Energy intake and body weight significantly increased in all groups combined throughout the study with no group or interaction differences observed. Dual energy x-ray absorptiometry-determined body mass significantly increased in each group throughout the study with significantly greater gains observed in the GF and P groups. Lean tissue mass (excluding bone) gain was significantly greater in the P group, while fat mass and percent body fat were significantly increased in the GF group. Results indicate that total body weight significantly increased in each group and that P supplementation resulted in significantly greater gains in lean tissue mass during resistance training.
R.B. Kreider, P. Grindstaff, L. Ramsey, D. Bullen, L. Wood, and Y. Li are with the Exercise and Sport Sciences Laboratory, Department of Human Movement Sciences and Education, The University of Memphis, Memphis, TN 38152. R. Klesges and K. Harmon are with The Prevention Center, Department of Psychology, The University of Memphis. A. Almada is with Experimental & Applied Science, Inc., 409 Corporate Circle Dr., Golden, CO 80401.