AbstractCaffeine (1,3,7-trimethylxanthine) is a habitual substance present in a wide variety of beverages and inchocolate-based foods and it is also used as adjuvant in some drugs. There have been numerous reports that caffeine is an ergogenic aid; ingestion of the drug has been shown to increase endurance, particularly in prolonged exercise lasting 30–120 min. The present study was undertaken to study the effects of caffeine in coffee on endurance exercise in young healthy adult males .Twenty young males participated in this single blind study. Participants underwent two testing sessions separated by 7 days, consisting of handgrip strength test, Rate of perceived exertion scale (RPE) test and an incremental test to exhaustion on treadmill. Paired ‘t’ test revealed significant difference in handgrip strength test, RPE scale, exhaustion time, maximal oxygen uptake (VO2max) and heart rate (p > 0.05) before and after caffiene ingestion. The present study indicates that caffeine consumed 60 minutes before exercisecan enhance exercise performance by increasing the total time to fatigue.

                        Keywords: caffiene ingestion, Vo2 max, exhaustion time n muscle strength.