Azarbaijan Shahid Madani University Journal of Applied Health Studies in Sport Physiology 2676-6507 6 2 2019 09 23 The Effect of Medium- And High- Dose of Caffeine (1,3,7-Trimethylxanthine) Intake on Cardiovascular Factors Response at Baseline and Following One-Bout Aerobic Exercise The Effect of Medium- And High- Dose of Caffeine (1,3,7-Trimethylxanthine) Intake on Cardiovascular Factors Response at Baseline and Following One-Bout Aerobic Exercise 25 31 13964 10.22049/jassp.2019.26574.1237 FA Ali Zarghami Kamaneh PhD of Sport Physiology, Department of Sport Physiology, Faculty of Physical Education and Sport Sciences, Tabriz University. Tabriz, Iran. Zhale Pashaei Department of Sport Physiology, Faculty of Physical Education and Sport Sciences, Tabriz University. Tabriz, Iran. Journal Article 2019 06 18 <strong>Aim: </strong>Caffeine is a naturally occurring substance that is widely consumed in a variety of forms. It produces multiple physiologic effects throughout the body. However, today the results of some scientific data on conflicting effects of caffeine compound on cardiovascular factorshave been reported. The purpose of the present study was conducted to identify the effect of different doses caffeine intake on some functional cardiovascular indices response in male volleyball players. <strong>Methods: </strong>Thirty male volleyball players (age 21.47±1.45 years, body fat 10.47±3.11 %, and BMI 23.15±1.26 kg.m²) were allocated equally into three groups (n=10): supplement groups (Caffeine intake: 6 or 9 mg.kg^-1) and placebo group (Dextrose intake: 6 mg.kg^-1). 45-min after the supplementation, subjects were participated in a one-bout exercise protocol (running on a treadmill for 30 minutes with intensity of 65-75% heart rate reserve). Changes in heart rate and blood pressure (systolic and diastolic pressure) along were determined in three phases (before and 45 min after the supplementation and immediately after the aerobic exercises). The data were analyzed by repeated measure ANOVA, bonferroni and independent T test at α≤0.05. <strong>Results: </strong>The results showed that the different doses of caffeine ingestion had leading to significant decreased heart rate (P=0.001) and increased the blood pressure indices on the basal (P=0.024). However, heart rate and blood pressure index was significantly increased in all groups after exercise without differences between groups (P≤0.05). <strong>Conclusion:</strong> Therefore, it can be concluded that medium- and high- dose of caffeine intake has the same effect on variation range of cardiovascular indices after exercise. <strong>Aim: </strong>Caffeine is a naturally occurring substance that is widely consumed in a variety of forms. It produces multiple physiologic effects throughout the body. However, today the results of some scientific data on conflicting effects of caffeine compound on cardiovascular factorshave been reported. The purpose of the present study was conducted to identify the effect of different doses caffeine intake on some functional cardiovascular indices response in male volleyball players. <strong>Methods: </strong>Thirty male volleyball players (age 21.47±1.45 years, body fat 10.47±3.11 %, and BMI 23.15±1.26 kg.m²) were allocated equally into three groups (n=10): supplement groups (Caffeine intake: 6 or 9 mg.kg^-1) and placebo group (Dextrose intake: 6 mg.kg^-1). 45-min after the supplementation, subjects were participated in a one-bout exercise protocol (running on a treadmill for 30 minutes with intensity of 65-75% heart rate reserve). Changes in heart rate and blood pressure (systolic and diastolic pressure) along were determined in three phases (before and 45 min after the supplementation and immediately after the aerobic exercises). The data were analyzed by repeated measure ANOVA, bonferroni and independent T test at α≤0.05. <strong>Results: </strong>The results showed that the different doses of caffeine ingestion had leading to significant decreased heart rate (P=0.001) and increased the blood pressure indices on the basal (P=0.024). However, heart rate and blood pressure index was significantly increased in all groups after exercise without differences between groups (P≤0.05). <strong>Conclusion:</strong> Therefore, it can be concluded that medium- and high- dose of caffeine intake has the same effect on variation range of cardiovascular indices after exercise. https://jahssp.azaruniv.ac.ir/article_13964_03ab0427c66c261895ce94b21adc0dd7.pdf