Muscle Fiber and Performance Adaptations to Resistance Exercise with MyoVive, Colostrum or Casein and Whey Supplementation
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abstract
To determine the effects of 12 weeks of resistance exercise with MyoVive and/or colostrum supplementation, 19 male andfemale recreationally weight-trained subjects (X SE; age = 28.3 6.9 yrs; hgt = 68.2 3.8 cm) were divided into MyoVive + colostrum (n = 4), MyoVive + casein & whey (n = 4), colostrum + casein & whey (n = 6), and casein & whey (n = 5) groups. All groups similarly increased (p < .05) 1 repetition maximum (RM) leg press kg; pre = 158.6 12.8, post = 189.3 11.3), body mass (kg; pre = 79.0 3.2, post = 80.7 3.8), and lean body mass (kg; pre = 60.1 3.1, post = 62.2 2.8). Increases were observed for peak force (N; all loads), peak velocity (ms-1; 70% & 40% 1 RM), and peak power (W; 70% & 40% 1 RM) for all groups for the leg press exercise, with no differences between groups. When performance data were adjusted for body mass, lean body mass, lower body lean mass as determined by DEXA, or % change, no group differences were observed. Relative (%)fiber type content, cross-sectional areas (m2), % fiber type areas, or % myosin heavy chain expression did not change for any group. These data suggest that MyoVive and colostrum supplementation have no greater effect on cellular and performance adaptations when compared to casein and whey protein.
