The purpose of a study by Jose Antonio of the University of Nebraska was to determine the effect of 8 weeks of colostrum, or whey protein supplementation, on body composition and exercise performance in active men and women. Subjects were randomly assigned to a placebo or colostrum group that received 20 grams per day. Each subject participated in aerobic and heavy resistance training 3-4 times per week. Muscular endurance was determined via treadmill time to exhaustion, and strength was assessed by the total number of repetitions performed during 1 set to exhaustion at a submaximal load (50 and 100% of body weight for women and men, respectively) and 1 repetition maximum on the bench press. The whey protein group experienced a significant increase in body weight (mean increase of about 4 pounds), whereas the colostrum group experienced a significant increase in muscle mass (mean increase of about 3 pounds). There were no changes in any of the strength measurements between groups after supplementation. In conclusion, supplementation with colostrum for 8 weeks resulted in a modest but significant increase in muscle mass in active men and women.
Journal of Strength and Conditioning Research. 14(3): 359, 2000.