Atatilrk Universitesi Beden Egilimi ve SporYuksekokuJu ogrencilerinden gonullu 25 klz, 50 erkek ileyapJlanbu <;:all§mada, slcak ve soi'Juk ortamda vapilan 15dakikallk JSlnma egzersizlerind~n sonraki - reaksiyonzamanlan ara§tIrlldI. Ogrencilerin reaksiyon zamanlanQFB 128 OA Q klavyeli bilgisayarla T. L. Davis ve D. YFrank'in hazlrJadlgJ basit reaksiyon testi i1e (ReactionTJme Movemenl V. 320) OI"lHdu.KJzlarda hem slcak hem de soguk ortamda sag ve sollarat' reaksiyon sureleri arasmdaki farklar anlamslzbulundu. Erkeklerde Slcak ortamda anlamslz.soguk ortamdaise sag laraf lehine anJamlt farldl bulundu (I : 3.84. p :0.000). Yine erkeklerde hem sag hem de sol larafLa slcakOl'tam lehine anlamll farkbllkJar bulundu (SIrayla t: 2.48 ,P : 0.02 ; t : 4.31 . P : 0.000). Bu sonu<;:lar 1§lglnda slcakortamm gorse1 reaksiyon zamanlnl kJsalttJgJ bulundu. Suise sJcak ortamm metabolizmayl hlzlandlrmasma, buortamda impu1s ileti hlzlrun artmasma bagll oJabilir. Summary1n this study performed on 25 female and 50 malevolunteers from Physical Education and Sports College,AlaUirk University, reaetion times each after a fifteen-minute -warm up-exercise performed under cold and warmconditions were tested. The reaction times of the studentswere tested by means of simple reaction time movementtest (reaction tlme movement V. 320) prepared by T. L.DaVIS and D. Y. Frank with a QFB 128 OA keyboardcomputer.The reaction time differences between right and Jeftsides iu girls both in cold and warm conditions were foundto be insignificant.. In male students, It was insignificantunder warm conditions and Significant for the right sideunder_ cold condLtlOns ( t: 3.84, p : 0.000). In addition,sJgmftcant differences were found under wann conditionsfor both right and left sides. In males (I : 2.48 , p : 0.02 ; t:4.31. p: O. respectively). Under the light of these findings,Jt was observed that warm conditions shorten the visualreaction tim~. This may occur due to speeding up the~etabollsm In wann condItion and the increasing of IheImpulse transfer speed.