Abstract
Aim. The study investigated the effects of the related physiological factors on the training performance among the subjects in the various weight classes. Methods. Twenty-seven elite division I male student Tae-kwon-do (TKD) players were studied. Each subject underwent a treadmill training program until complete exhaustion at a starting speed of 15 mph, followed by increment by 5 mph every 2 min. The heart rate (HR) and oxygen consumption were assessed by a wireless heart recorder (POLAR) and Vmax 29 gas analyzer. The One-Way ANOVA Repeated Scheffe was used for the statistical analysis. Results. Group 3 TKD players exhibited a slower HRmax than group 1 and 2 subjects (P<0.05). In addition, group 3 TKD players also showed a lower V̇O <sub>2max</sub> than group 1 and 3 subjects (P<0.05), as well as a lower blood lactic acid levels (P<0.05), respectively. With regards to the urobilinogen post-exercise at 15th min, group 3 TKD players showed a significantly higher level as compared with group 1 and 2 subjects (P<0.05). Group 2 TKD players showed a significantly higher urobilinogen level than group 1 and 3 subjects (P<0.05). The results showed that group 1 TKD players performed better than the other groups. Conclusion. The TKD players in different weight classes showed different V̈O <sub>2max</sub> and urobilinogen levels. Thus, the data (V̇O <sub>2max</sub> , blood lactic acid, urobilinogen, power output) can be used as reference for both coaches and players to understand the TKD player's physical condition.