Kuongorora kwakarongeka uye meta-analysis kubva ku2014 yakawana kuti caffeine uye L-theanine inoshandiswa ine psychoergistic synergistic mhedzisiro inosimudzira kudzidza uye ndangariro, asi kazhinji inovandudza nguva yekupindura, kumuka, kusimbisa, uye mota yekubatanidza. Huwandu hwecaffeine hunodiwa kuburitsa izvi mhedzisiro hunosiyana kubva kumunhu kuenda kumunhu, zvichienderana nehukuru hwemuviri uye nhanho yekushivirira. Mhedzisiro inodiwa inomuka inenge awa imwe mushure mekushandisa, uye mhedzisiro inodiwa yedosi yepakati inowanzo kudzikira mushure memaawa matatu kana mana. Caffeine inogona kunonoka kana kudzivirira kurara uye kunatsiridza kuita basa panguva yekushomeka kwekurara. Vashandi veShift vanoshandisa caffeine vanoita zvikanganiso zvishoma nekuda kwekuneta. Ongororo yenguva dzose uye meta-analysis kubva ku2014 yakawana kuti caffeine uye L-theanine ine synergistic synergistic mhedzisiro inosimudzira basa, kusvinura, uye kutarisisa; izvi mhedzisiro zvinowanzo kuve pachena mukati me
kukura kwomuviri uye mwero wokushivirira