▁grad ed ▁exercise ▁t read mill ▁testing ▁or ▁an a er ob ic ▁energy ▁ass essed ▁via ▁a ▁ 3 0 - second ▁cycle ▁s print . ▁However , ▁a ▁study ▁involving ▁active ▁men ▁noted ▁very ▁favor able ▁performance ▁effects ▁of ▁G PL C , ▁as ▁well ▁as ▁a ▁significant ▁reduction ▁in ▁blood ▁la ctic ▁acid , ▁a ▁by product ▁of ▁an a er ob ic ▁met abol ism ▁thought ▁to ▁imp air ▁mus cle ▁performance . ▁ ▁Specifically , ▁in ▁this ▁study ▁conducted ▁by ▁Patrick ▁Jacob s ▁and ▁colle agues , ▁ 2 4 ▁health y , ▁exercise ▁trained ▁men ▁consum ed ▁either ▁ 4 . 5   gram s ▁of ▁G PL C ▁or ▁a ▁place bo ▁on ▁two ▁different ▁days ▁separated ▁by ▁one ▁week ▁( double ▁blind , ▁cross - over ▁study ▁design ). ▁Nin ety ▁minutes ▁following ▁ing estion ▁of ▁the ▁assigned ▁treatment , ▁subjects ▁performed ▁five , ▁maximal ▁effort ▁cycle ▁s print ' s , ▁each ▁last ing ▁ 1 0 ▁seconds ▁in ▁duration . ▁They ▁were ▁given ▁one ▁minute ▁of ▁“ active ” ▁recovery ▁between ▁each ▁s print . ▁The ▁peak ▁and ▁mean ▁power ▁output , ▁as ▁well ▁as ▁the ▁blood ▁la ctic ▁acid , ▁was ▁measured ▁for ▁both ▁conditions . ▁Results ▁indicated ▁that ▁power ▁output ▁was ▁up ▁to ▁ 1 5 % ▁higher ▁following ▁the ▁g ly c ine ▁prop ion yl - l - c arn it ine ▁tri als ▁compared ▁to ▁place bo , ▁while ▁post - ex erc ise ▁blood ▁la ctic ▁acid