Alterations Of Body Function And Endocrinological Index In Weight Loss Trials Of Elite Wrestlers And Judoists

The purpose of this study was to investigate the changes of physiological determinants such as testosterone, cortisol and neuropeptides related to energy balance in period of 6 week weight loss trials of elite male Judoists (divided into weight loss group (n=7) and control group (n=6)) who gained rights of final competitions for the 10th national games. It was also arranged to assess changes of hormones, strength and power output possibly related to myostatin concentration of elite male free-style wrestlers (divided into weight loss group (n=8) and control group (n=8)) in 2 weeks lasting weight loss trials.1.The elite male Judoists'body weight, percent fat, fat mass, fat free mass and body mass index decreased in 6 week weight loss trials. There were similar reductions of body weight, fat mass and body mass index in elite free-style wrestlers in 2 week weight loss trials. It was concluded that the reduction of body weight related to negative energy balance in weight loss trials of Judoists and results showed that total energy, relative energy consumption significantly decreased. Judoists'relative protein, relative fat, relative carbohydrates, percent energy from protein and fat significantly decreased and percent energy from carbohydrates significantly increased.2.There were no alterations in physiological determinants of Judoists in 6 week weight loss trials, but elite free-style wrestlers'testosterone level decreased, cortisol level and creatine kinase activity increased in 2 week weight loss trials. The results suggested that phase of weight loss could have affect the alterations in physiological determinants such as T, C and CK in weight loss trials.3.This is the novel study that we found increased orexin A, decreased leptin and no alteration in neuropeptide Y in 6 week weight loss trials of Judoists, and results showed similar trends in 2 week weight loss trials of wrestlers. It suggested that alterations in orexin A and leptin are more sensitive to dietary restricted training protocols of athletes who need to weight reduction, further indication from this study that neuropeptides have their functional alterations in negative energy balance.4.In this study, Biodex system 3 was applied to determine the peak torque and relative peak torque of free-style wrestlers in weight loss trials.There were significant reductions of 7.5% and 3.0% in elbow extension peak torque at 60o/s and 180o/s of weight loss group compared with control group respectively, and significant elevations of 6.5% and 8.9% in elbow relative flexion peak torque at 60o/s and 180o/s of weight loss group compared with control group respectively; After weight loss trials, compared with control group, the knee extension peak torque of weight loss group reduced significantly at 60o/s for 14.5%, flexion peak torque reduced at 180o/s for 20.3%, relative extension peak torque at 180o/s for 3.7% and relative flexion peak torque at 180o/s for 15.3%, respectively. This investigation is novel because it is the first study of weight loss wrestlers to investigate the changes of plasma myostatin, western blotting revealed that after weight loss trials, there were no significant alterations in myostatin concentration, but it elevated 7.12%, and there were significant relations between myostatin concentration and 180o/s,60o/s elbow relative extension peak torques, and has a trend of relations between peak torques.5.There was no significant difference of the peak power and relative peak power in both groups after 30s Wingate test of Wrestlers, but after weight loss trials there are significant reductions in average power, relative average power and elevation in fatigue index in weight loss group. The results suggested that 2 week caloric restriction and training affect power output of Wrestlers.