The Effects of 12-Week Eccentric Resistance Training on the Cardiovascular Risk Markers of Middle-Age Females

• Main Authors: Lee Shuei-Pi, 李水碧
• Other Authors: Fang Chin-Lung
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/00467823932558732673

博士 === 國立臺灣師範大學 === 體育學系 === 95 === BACKGROUND：Cardiovascular disease is associated with inflammation, whether resistance training can lower inflammation and decrease the risk of heart disease deserved further investigation. PURPOSES：The purposes of this study were to investigate the effect of 12-week eccentric resistance training on cardiovascular risk factors, including C-reactive protein (CRP), total homocysteine (tHCY), cardiovascular relative risk, cardiovascular risk classification and the related physiological variables of middle-age females. METHODS：There were 38 middle-age female were recruited as the subjects for this study and randomly and equally divided into experimental group (48.5±7.0 years）and control group（49.1±7.1years）. The subjects of experimental group were engaged in eccentric resistance training 3 days per week, 60 minutes ( including 10 minutes warming up, 40minutes resistance-exercise and 10 minutes cool down ) each session for 12 weeks; while the control subjects received no training. The resistance training emphasizes the eccentric portion with 6 seconds and 2 seconds for concentric contraction in one repetition. The variables of tHCY, CRP, total cholesterol, HDL-C, LDL-C, triglyceride, body composition, muscular endurance and physical fitness were measured or tested before and after 12 weeks of training. The cardiovascular global relative risk was assessed by the values of CRP with blood lipids (TC：HDL-C ratio). The cardiovascular global risk levels were evaluated by the values of CRP and LDL-C. the collected data were analyzed or compared by independent t test, Chi-square and multiple regression. RESULTS: After 12-week eccentric resistance training, the variables of body fat percent, fat mass and waist circumference have significantly decreased(P<.05), while the lean body weight was significantly increased (p＜.05). However, the body weight and waist-hip ratio didn’t cause significant change (p＞.05). The cardiovascular fitness(6-minute walk test) and muscular endurance(including modified push-up, abdominal hold, and wall sit) increased significantly (all p＜.05) after training. The levels of CRP were significantly improved (1.35±1.17 vs. 0.64±0.49 mg/L, p＜.05) after training, and the body weight, BMI, cardiovascular fitness, and waist circumference were the predictive variables for decreasing CRP. The levels of tHCY was slightly increased (13.0±3.4 vs. 14.1±2.7μmol/L) after 12 weeks of training, however it did not change significantly (p＞.05). The variables of cardiovascular relative risk and cardiovascular risk classification also were significantly improved (both p＜.05). CONCLUSION: The inflammation, cardiovascular global risk and health-related physical fitness were significantly improved after 12- week eccentric resistance training of middle-age females.