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Báo cáo y học: " Metabolic responses to high protein diet in Korean elite bodybuilders with high-intensity resistance exercise"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Metabolic responses to high protein diet in Korean elite bodybuilders with high-intensity resistance exercise | Kim et al. Journal of the International Society of Sports Nutrition 2011 8 10 http www.jissn.eom content 8 1 10 journal of the international lociety of Iporti nutrition SHORT REPORT Open Access Metabolic responses to high protein diet in Korean elite bodybuilders with high-intensity resistance exercise Hyerang Kim1 Saningun Lee2 and Ryowon Choue2 3 Abstract Background High protein diet has been known to cause metabolic acidosis which is manifested by increased urinary excretion of nitrogen and calcium. Bodybuilders habitually consumed excessive dietary protein over the amounts recommended for them to promote muscle mass accretion. This study investigated the metabolic response to high protein consumption in the elite bodybuilders. Methods Eight elite Korean bodybuilders within the age from 18 to 25 mean age 21.5 2.6. For data collection anthropometry blood and urinary analysis and dietary assessment were conducted. Results They consumed large amounts of protein 4.3 1.2 g kg BW day and calories 5 621.7 1 354.7 kcal day as well as more than the recommended amounts of vitamins and minerals including potassium and calcium. Serum creatinine 1.3 0.1 mg dl and potassium 5.9 0.8 mmol L and urinary urea nitrogen 24.7 9.5 mg dl and creatinine 2.3 0.7 mg dl were observed to be higher than the normal reference ranges. Urinary calcium 0.3 0.1 mg dl and phosphorus 1.3 0.4 mg dl were on the border of upper limit of the reference range and the urine pH was in normal range. Conclusions Increased urinary excretion of urea nitrogen and creatinine might be due to the high rates of protein metabolism that follow high protein intake and muscle turnover. The obvious evidence of metabolic acidosis in response to high protein diet in the subjects with high potassium intake and intensive resistance exercise were not shown in this study results. However this study implied that resistance exercise with adequate mineral supplementation such as potassium and calcium could reduce or offset the .