Effect of Caffeine on Endurance Duration of Student Using Graded Exercise Test

Background Caffeine has ergogenic effect that can increase exercise performance by using lipid energy storage that is responsible to the effectiveness of glycogen metabolism of muscle so can prevent tiredness. Aim Purpose of this study was to see the effect of caffeine on endurance duration of student from Airlangga Medical University. Method Forty healthy male students from Airlangga Medical University were randomized and divided in control group (n = 20) and experimental group (n = 20). They were given placebo (empty capsule) or caffeine capsule (3 mg/kg body weight). Graded exercise test used ergo cycle with increased load ½ kp every 6 minutes until subjects reach 80% submaximal heart rate. Heart rate recovery is measured in the first, third and fifth minute. The tiredness between the groups is measured in a subjective value with a scale range from 1-10. Variabels were compared by using paired t test. Result No significant duration (p > 0.05). No significant heart rate recovery in the first and third minute (p > 0.05) but significant in the fifth minute (p < 0.05). Significant tiredness (p < 0.05). Analysis Effect  caffeine to the heart rate affect the duration of exercise. Conclusion No significant difference in the student’s duration of endurance.