PENGARUH PEMBERIAN KOPI TERHADAP KELELAHAN OTOT

Abstract

Background : Coffee, these days is widely used before exercise to improve performance and prevent muscle fatigue. It’s main component, caffeine, plays a role in Calcium ion transport in muscle contraction, increases fatty acid availability to be oxidated to provide energy and reduces carbohydrate oxidation so that glycogen depletion that causes muscle fatigue can be delayed. Based on recent studies ,coffee’s role in improving exercise performance still remains in controversy. This study is aimed to prove the effect of coffee ingestion before exercise on muscle fatigue with anaerobic fatigue (AF) as anaerobic parameter , and VO2max as aerobic parameter. Methods : This was experimental study with post test only controlled group design. The subjects of this study were 48 male students of medical faculty Diponegoro university (19-21 years old of range )that fulfilled the exclution and inclution criterias. The subjects were divided into 2 groups, control group (without treatment) and treatment group. Treatment group was given a cup of coffee consists of 15 grams of instant coffee dan 200 ml of water 6o minutes before the test. Anaerobic phase of muscle fatigue was measured with Wingate test, aerobic phase was measured with Ergocycle test. Results: Measurement with Wingate test, proportion of fatigue(in %) based on AF value on treatment group was smaller than the control group. Chi square test result in p=0,119, so that it can be concluded as unsignificant. Measurement with ergocycle test result in VO2max mean difference between treatment and control group, where the mean of control group was smaller than the treatment group. T-independent test result in p=0,071, so it can be concluded that the difference was not significant. Conclusion: Coffee ingestion, 60 minutes before exercise doesn’t affect muscle fatigue neither anaerobic (AF) nor aerobic phase (VO2max). Keywords : Coffee, Anaerobic fatigue(AF), VO2max