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Composition and Endocrine Changes in Strength/Power Athletes Jay R. Hoffman, Nicholas A. Ratamess, Jie Kang, Michael J. Falvo, Avery D. Faigenbaum The College of New Jersey, Ewing, NJ. Address correspondence to Received May 12, 2006/Accepted November 8, 2006 experienced collegiate strength/power athletes participating in a 12-week resistance training program. Subjects were stratified into three groups depending upon their daily consumption of protein; below recommended levels (BL; 1.0 1.4 g testosterone, cortisol, growth hormone, and insulin-like growth factor. No differences were seen in energy intake (3,171 ± 577 kcal) between the groups, and the energy intake for all groups were also below the recommended levels for strength/power athletes. No significant changes were seen in body mass, lean body mass or fat mass in any group. Significant improvements in 1-RM bench press and 1-RM squat were seen in all three groups, however no differences between the groups were observed. Subjects in AL experienced a 22% and 42% greater change in 1-RM squat and 1-RM bench press than subjects in RL, however these differences were not significant. No significant changes were seen in any of the resting hormonal concentrations. The results of this study do not provide support for protein intakes greater than recommended levels in collegiate strength/power athletes for body composition improvements, or alterations in resting hormonal concentrations. Journal of the International Society of Sports Nutrition. 3(2):12-18, 2006 Key Words: Sport Nutrition, Resistance Training, Hormones, Testosterone, Cortisol INTRODUCTION Relative to endurance athletes and the sedentary population, a greater protein need exists for strength/power athletes appears that daily protein consumption should be between 1.6 to 1.8 g protein synthesis necessary to assist in the repair and remodeling process of skeletal muscle fibers damaged during a resistance exercise session muscle size and strength. The beneficial effects of a high protein intake may also be reflected by improvements in body composition through increasing lean tissue accruement anabolic hormones involved with muscle remodeling resting concentrations of testosterone remain inconclusive. Both increases Recommendations of a greater protein requirement for resistance-trained athletes have been based on studies that have primarily examined recreationally- trained individuals and not competitive athletes. This may suggest that the protein requirements for experienced resistance trained competitive athletes may be even higher than what is presently accepted. Since protein supplementation is considered to be one of the more common nutritional supplements used by collegiate athletes exceed the recommended daily allowances. Whether |
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