%0 Journal Article %T Effects of caffeine ingestion on strength and endurance performance of normal young adults %A Sharma Archna %A Sandhu S Jaspal %J Doping Journal %D 2010 %I %X There are a number of studies evaluating the effects of various dosages of caffeine on performance variables viz. isometric strength & endurance performance, but the effects of caffeine on exercise performance are controversial. There is paucity of conclusive evidence regarding the proposed ergogenic effects of caffeine. The purpose of this experimentation was to investigate whether caffeine (5mg/kg body weight) exerts an ergogenic effect on maximal force production and fatigue of human quadriceps muscle; as well as on the cardio-vascular endurance performance in 31 healthy students (17 male & 14 female), following one hour administration. Subjects ingested either a placebo or caffeine capsule following which peak force, average force and fatigue index of quadriceps and time to exhaustion were measured and compared with placebo. Post-exercise urine samples were obtained. A significant decrease in fatigue index of quadriceps (p=0.011) and significant increase in time to exhaustion (p=0.001) was observed for caffeine trial as compared to placebo. However, no significant increase in peak force (p=0.144) and average force (p=0.192) of quadriceps was observed for caffeine trial as compared to placebo. Mean urinary caffeine concentrations were 2.80¡À2.21, 4.79¡À2.11 and 3.55¡À2.57 ¦Ìg/ml for 1st, 2nd and 6th hour post-exercise respectively, which is below caffeine dope limit. In conclusion, caffeine (5mg/kg BW) has an ergogenic effect on isometric muscular endurance and cardio-vascular endurance but not on maximal force generating capacity of the human quadriceps muscle. %K Caffeine %K force %K fatigue index %K exhaustion %K urinary caffeine %K doping in sport %U http://dopingjournal.org/content/7/2/dopingj032008-01.html