Effects Of Male Obesity On The Physiological And Metabolic Reaction In Acute Endurance Exercise Of Differing Intensity

There are more and more obese men all over the world. Prevention and treatment of obesity have been becoming one of the focus of human healthy problems. Aerobic exercise and adjustment of diet have been accepted extensively. The metabolism of carbohydrate and fat, which are the main energy resources , vary with different diet and exercise intensity. Therefore , studying the change of carbohydrate and lipid metabolism in obese man during endurance exercise is a principal task to prevent and treat obesity.The purpose of this research is to investigate the change of some physiological indexes such as Heart Rate, Blood Pressure, RPE and some biochemical indexes such as the Level of plasma GLU, TG, FFA and GH during endurance exercise of 40% and 65%VO2max in obese and control group, and explore whether difference exists in obese and control group, meanwhile analyze the metabolic state of endogenous carbohydrate and fat.Results: i .At the fasting condition: l)The HR and diastolic Blood Pressure of obese group are all significantly higher than that of normal subjects(P<0.05). Although the difference in systolic Blood Pressure is not that significant, it has the trend to ascend in obese group. 2)RQ and the level of plasma TG and FFA in obese group are significantly higher than those of normal subjects (P<0.05).3)There is no significant difference in plasma [GLU] between obese group and normal subjects , but the trend to ascend in obese group is obvious, ii. During exercises: l)The VO2max in obese group is significantly higher than that in normal subjects (P<0.001) .2) RQ(P<0.01) and HR, Blood Pressure (P<0.05), RPE (exercise at 40%V0_2max P<0.001; exercise at 65%V0_2max P<0.01) in obese group are significantly higher than those in normal subjects during exercises and need longer period to recover (recovery period: HR, P<0.01; BP, P<0.05). 3)There is significant difference in thelevel of plasma GLU (exercise at 40%VO_2max P<0.05) between obese and normal subjects; Plasma [TG] in obese group has the trend to ascend but the incremental range has the trend to descend; The difference in plasma [FFA] is not significant, but the incremental range in obese subjects is significantly lower than that in normal subjects (P<0.05). 4)Plasma [GH] in obese subjects has the trend to descend compared to that in normal subjects , suggesting that obesity possibly attenuates the response of Growth Hormone to exercise, iii. The reaction of obese group during 40% and 65%VO_2max exercises: 1 ) During exercise at 65%V0_2max HR(P<0.0l) and systolic Blood Pressure are significantly higher and diastolic Blood Pressure is significantly lower than those during exercise at 40%VO_2max (P<0.05) and need longer period to recover (recovery period: HR, obese group P<0.01, normal subjects P<0.05 , BP, obese group P<0.05, there is no significant difference in normal subjects). 2 ) During exercise at 65%VO_2max RPE is significantly higher than that during exercise at 40%VO_2max (P<0.01) .3)The level of plasma FFA during exercise at 40%VO_2max is significantly higher but RQ and the level of plasma GLU are significantly lower than those during exercise at 65%VO2max (P<0.05), suggesting that energy mainly comes from lipolysis during exercise at 40%VO2max; The level of plasma GH during exercise at 65%VO_2max has the trend to ascend compared with that during exercise at 40%VO_2max but the difference is not significant.The main conclusion: 1. The accumulation of body fat not only affects the Cardiovascular function at rest condition but also strengthens the reaction of Cardiovascular system to endurance exercise at 40%VO2max and 65%VO2max and fatigue is appears earlier than normal subjects during exercise. 2. Obese subjects have lower fat oxidation and more increases rely on Carbohydrates than normal subjects at rest condition and during exercise. 3. exercise at 40%VO_2max could mobilize fat in larger extent and could be accepted by obese subjects easily than 65%VO2max exercise.