Azarbaijan Shahid Madani University Journal of Applied Health Studies in Sport Physiology 2676-6507 4 1 2017 03 21 The effect of caffeine ingestion on anaerobic performance and fatigue index in the morning and the evening times. The effect of caffeine ingestion on anaerobic performance and fatigue index in the morning and the evening times. 60 67 13911 10.22049/jassp.2019.26549.1220 FA Mohammad Rahman Rahimi ِDepartment of Exercise Physiology, Faculty of Humanities and Social Sciences, University of Kurdistan, Sanandaj, Iran Ali Jafari Department of exercise physiology, , Faculty of Humanities and Social Sciences, University of Kurdistan, Sanandaj, Iran. Hadi Golpasandi Department of Exercise Physiology, Faculty of Humanities and Social Sciences, University of Kurdistan, Sanandaj, Iran Journal Article 2019 06 15 Introduction: The consumption of sports supplement and also the effect of the effect of Times of the day on improving exercise performance have been important issues in the past and present. The aim of this study was to evaluate the effect of caffeine supplementation on anaerobic performance and fatigue index during the morning and afternoon in high school physical education student.<br />Methods: The anaerobic power of subjects (n =12) was determined by a single- blind, placebo controlled and crossover design, under three conditions of caffeine intake of 6 mg / kg, placebo in 6 mg / kg 6 dextrose and basal conditions in the morning and the evening Morning and evening were evaluated. To analyze the data, repeated measures ANOVA and t-test were used.<br />Results: The results showed that the variables measuring the effect of time (morning and evening) was significant. However, the effect of conditions (caffeine, placebo, and basal) was not significant (P> 0.05). The interaction of time and conditions was significant only in the minimum power and fatigue index (P <0.05).<br />Conclusion: The results showed that caffeine had no significant effect on the anaerobic function of the subjects. In all three conditions, the anaerobic function of the subjects was better in the morning than in the evening, and the only exception was fatigue index, which was not different between morning and evening. Introduction: The consumption of sports supplement and also the effect of the effect of Times of the day on improving exercise performance have been important issues in the past and present. The aim of this study was to evaluate the effect of caffeine supplementation on anaerobic performance and fatigue index during the morning and afternoon in high school physical education student.<br />Methods: The anaerobic power of subjects (n =12) was determined by a single- blind, placebo controlled and crossover design, under three conditions of caffeine intake of 6 mg / kg, placebo in 6 mg / kg 6 dextrose and basal conditions in the morning and the evening Morning and evening were evaluated. To analyze the data, repeated measures ANOVA and t-test were used.<br />Results: The results showed that the variables measuring the effect of time (morning and evening) was significant. However, the effect of conditions (caffeine, placebo, and basal) was not significant (P> 0.05). The interaction of time and conditions was significant only in the minimum power and fatigue index (P <0.05).<br />Conclusion: The results showed that caffeine had no significant effect on the anaerobic function of the subjects. In all three conditions, the anaerobic function of the subjects was better in the morning than in the evening, and the only exception was fatigue index, which was not different between morning and evening. https://jahssp.azaruniv.ac.ir/article_13911_458b9394bc4807ecc21ccc9d6a326e9c.pdf