Abstract:
The objective of this study was to examine the effect of Thiamine loading on the endurance performance during exercise of volunteers. Measurements were performed on 22 male subjects who regularly exercised. Subjects were given a glass of water mixed with thiamine powder 2 hour before the measurement. Then, 11 participants were given 10 mg of Thiamine (TG-10) and the remaining 11 were given 30 mg (TG-30). Subjects began the exercise test at a running speed of 7km/hour. The speed was increased 1 km/hour every 3 minutes, and the test continued until the speed reached 10 km/hour. Heart rate was registered using portable heart rate monitor during the test. The recovery times of heart rate were measured (time that is taken to return to resting heart rate after running at speed of 10km). Blood samples were taken from fingertips of volunteers both before the test and before the speed increase (during the 1-minute interval), and the lactate concentration was measured by lactate analyzer. The test was repeated after 1 week as a group of placebos (P-10 and P-30). The t-test and repeated measure ANOVA were used for statistical analysis. The result showed that the resting heart rate was decreased in both supplemented groups compared with placebos (p ≤ 0.05). A significant reduction in heart rate at the speed of 8 km/hour was found in TG-10 and TG-30 (p ≤ 0.05), however there was no statistical significance in heart rate at 7,9,10 km/hour (p>0.05). There was no statistical significance in heart rate at the speed of 7,8,9,10 km/hour in P-10 and TG-10, P-30 and TG-30 (p>0.05). When the lactate concentrations were analyzed, there was no statistical significance in lactate level at the speed of 7,8,10 km/hour, but a significant reduction at the speed of 9 km/hour was found in TG-10 and P-10 (p ≤ 0.05). There was no statistical significance in lactate level at the speed of 7,8,9,10 km/hour in P-30 and TG-30, TG-10 and TG-30 (p>0.05). There was no statistical significance in recovery time in all groups (TG-10 and TG-30, P-10 and TG-10, P-30 and TG-30) (p>0.05).