Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Long-term glycine propionyl-l-carnitine supplemention and paradoxical effects on repeated anaerobic sprint performance | Jacobs and Goldstein Journal of the International Society of Sports Nutrition 2010 7 35 http content 7 1 35 jissn journal of the onal society of sports nutrition RESEARCH ARTICLE Open Access Long-term glycine propionyl-l-carnitine supplemention and paradoxical effects on repeated anaerobic sprint performance Patrick L Jacobs Erica R Goldstein Abstract Background It has been demonstrated that acute GPLC supplementation produces enhanced anaerobic work capacity with reduced lactate production in resistance trained males. However it is not known what effects chronic GPLC supplementation has on anaerobic performances or lactate clearance. Purpose The purpose of this study was to examine the long-term effects of different dosages of GPLC supplementation on repeated high intensity stationary cycle sprint performance. Methods Forty-five resistance trained men participated in a double-blind controlled research study. All subjects completed two testing sessions seven days apart 90 minutes following oral ingestion of either grams GPLC or grams cellulose PL in randomized order. The exercise testing protocol consisted of five 10-second Wingate cycle sprints separated by 1-minute active recovery periods. Following completion of the second test session the 45 subjects were randomly assigned to receive g g or g GPLC per day for a 28 day period. Subjects completed a third test session following the four weeks of GPLC supplementation using the same testing protocol. Values of peak power PP mean power MP and percent decrement of power DEC were determined per bout and standardized relative to body mass. Heart rate HR and blood lactate LAC were measured prior to during and following the five sprint bouts. Results There were no significant effects of condition or significant interaction effects detected for PP and MP. However results indicated that sprint bouts three four and five produced 2 - 5 lower values of PP and 3 - 7 lower values of MP with GPLC
