Paraxanthine, babban metabolite na caffeine, an gwada shi kai tsaye da caffeine a kan maza 14 masu horon rowing. Haɗin 200 mg na kowanne ya fi placebo a tseren mita 2000, amma tasirinsa ƙanana (d = 0.30). Babu ɗayan sinadaran da ya nuna ƙaruwa a aikin su kai kaɗai, yayin da paraxanthine kaɗai ya fi dacewa da barci. An gabatar da lambobi, iyakoki, da ƙungiyoyin da za su amfana da wannan bincike.
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