| Summary: | 碩士 === 國立臺灣體育學院 === 運動健康科學系碩士班 === 98 === Cycling has become one of the options of leisure activities. Previous studies have demonstrated the impact of endurance exercise on cardiac damage in well-trained athletes. The effect of long-term endurance exercise on cardiac damage in untrained persons still remains unclear. The purpose of this study was to evaluate heart damage during different exercises in healthy people. These studies were achieved by: (1) 32 untrained healthy subjects (24 males and 8 females, 19-38 years old) who participated in 2008 The Ironcamel Cycling Tour of Taiwan. The tour covered 1114 km in 15 days. All subjects were in a free-feeding style during the tour. Fasting blood samples were collected in the early morning on day 1, 5, 10, 15 during the tour and 4 days after the tour. (2) 10 trained healthy males who participated in 2008 Dong Hwa University Triathlon Championships. All subjects completed for 750 meter swim (limited time : 30 minutes), 20 km bike (50 minutes), and 5 km road race (40 minutes). Water-drinking was not restricted for all subjects during the competition, and blood samples were collected before and after the race.
All plasma samples were analyzed for myoglobin, creatine kinase MB (CK-MB), N-terminal B-type Natriuretic Peptide (NT-proBNP) and cardiac troponin T (cTnT) concentrations. The results showed: (1) the concentration of myoglobin was significantly increased on day 5; that of CK-MB was significantly increased during the tour; and that of NT-proBNP was peaked on day 5, then was slowly reduced and returned to baseline level . (2) myoglobin, CK-MB, and NT-proBNP levels after the race were significantly higher than before. cTnT levels were detected below the minimum before and after the race. The current results suggested that biomedical markers of heart damage might be increased according to the increase in exercise intensity and time after long-term cycling tour and triathlon, but soon returned to their original levels, changes are in the standard rage. General young people who are enjoying these kinds of activities might not have the necessity to worry about big health concerns on cardiac aspects.
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