Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Skill execution and sleep deprivation: effects of acute caffeine or creatine supplementation - a randomized placebo-controlled trial | Cook et al. Journal of the International Society of Sports Nutrition 2011 8 2 http content 8 1 2 jissn journal of the international lociety of rporti nutrition RESEARCH ARTICLE Open Access Skill execution and sleep deprivation effects of acute caffeine or creatine supplementation - a randomized placebo-controlled trial í I r I r I I lz 1 3 4 3 p I I r I Í A r3 3 I I Am n IZ I IĨĨ2 3 c I ì V 1A A I A 1 3 í I r I r l I rt A I 11 A- 5 3 Christian J Cook Blair I Crewtner Liam P KilaufT Scott Drawer Chris M uaviyiio Abstract Background We investigated the effects oT sleep deprivation with or without acute supplementation oT caffeine or creatine on the execution of a repeated rugby passing skill. Method Ten elite rugby players completed 10 trials on a simple rugby passing skill test 20 repeats per trial following a period of familiarisation. The players had between 7-9 h sleep on 5 of these trials and between 3-5 h sleep deprivation on the other 5. At a time of h before each trial they undertook administration of either placebo tablets 50 or 100 mg kg creatine 1 or 5 mg kg caffeine. Saliva was collected before each trial and assayed for salivary free cortisol and testosterone. Results Sleep deprivation with placebo application resulted in a significant fall in skill performance accuracy on both the dominant and non-dominant passing sides p . No fall in skill performance was seen with caffeine doses of 1 or 5 mg kg and the two doses were not significantly different in effect. Similarly no deficit was seen with creatine administration at 50 or 100 mg kg and the performance effects were not significantly different. Salivary testosterone was not affected by sleep deprivation but trended higher with the 100 mg kg creatine dose compared to the placebo treatment p . Salivary cortisol was elevated p with the 5 mg kg dose of caffeine vs. placebo . Conclusion Acute sleep deprivation affects performance of a simple repeat skill in elite .
