ABSTRACT
BACKGROUND: The aim of this study was to determine hormonal responses to acute and chronic exposure to static and dynamic strength training programs using resistance bands in boxers. MATERIAL AND METHODS: 19 male national boxers participated in the study. Boxers were instructed to perform strength exercises with resistance bands for 3 days a week for 8 weeks involving either dynamic (n=10) or static (n=9) resistance exercises. Blood samples were taken before exercise, immediately after the initial exercise session, and 8 weeks later following the last exercise session. Cortisol, growth hormone, adrenocorticotropic hormone adrenaline and noradrenaline levels were measured. Statistical analyses involved non-parametric analysis with an alpha level of .05. RESULTS: Dynamic strength exercises were effective stimuli to growth hormone, adrenaline and noradrenaline, while static strength exercises provoked cortisol, growth hormone, adrenaline and noradrenaline responses both initially after exercise and after 8 weeks of chronic training. Neither dynamic nor static strength exercises were effective in prompting adrenocorticotropic changes after an exercise session or after 8 weeks of training. CONCLUSIONS: We showed that dynamic and static strength exercise protocols using resistance bands both could provoke acute and chronic hormonal responses in boxers similar to more traditional modes of such exercise.
ABSTRACT
PURPOSE: The aim of this study is to determine the effect of rafting and paragliding exercises by sedentary males on serum lipids. MATERIAL AND METHODS: 17 male rafters and 10 male paragliders volunteers (non-smoker, no known history of cardiovascular disease, body mass index <25 kg/m2, and no intake of prescription medications) participated in the study. Participants had blood samples taken a day before and after rafting and paragliding practices. Data were analyzed by Wilcoxon and Mann-Whitney U tests. RESULTS: Significant decreases occurred for the low-density lipoprotein (LDL)/very low-density lipoprotein (VLDL) ratio in the rafting group after the exercise; though, there was no significant difference in serum lipids parameters of the paraglide group after the exercise. CONCLUSION: While acute rafting and paragliding exercises have similar effects on TG and HDL, effect on LDL/VLDL ratio is different.
ABSTRACT
Extensive exercise induces inflammatory reactions together with high production of free radicals and subsequent liver and kidney tissues damage. This study was designed to investigate for effects of melatonin on liver and kidney tissues in the extensive exercise exposed rats and non-exercised rats. In this research, 24-male Sprague-Dawley rats were divided into four groups. For exercise rat model, the rats were exposed to slow pace running with the velocity of 10 m/min for 5 minutes for five days just before the study. And for last ten days after adaptation period, the exercise was improved as 15 min with the speed of 20 m/min and intra-peritoneal melatonin injection has been performed to the melatonin treated groups with the dose of 10 mg/kg. Biochemical results revealed a decrease in the parameters of kidney and liver enzymes in exercise-group and an increase in the parameters of serum, liver and kidney enzymes in the group that melatonin-exercise-group. As for histological analysis, while it is observed that there are cellular degenerations in the liver and kidney tissues with exercise application, a decrease has been observed in these degenerations in the group that melatonin was applied. At the end of the research, it has been determined that exercise application causes some damages on liver and kidney, and these damages were ameliorated with melatonin treatment.
