MiscellaneousCardiac troponin T and I, electrocardiographic wall motion analyses, and ejection fractions in athletes participating in the Hawaii Ironman Triathlon
Section snippets
Subjects
The 23 participants who completed the 1994 triathlon were exceptionally well-trained amateur athletes. Their average weekly training distances consisted of 8 km swimming, 330 km cycling, and 75 km running. Additional information regarding their training regimen has been previously reported.4 An additional group of 19 athletes, with similar training characteristics, who completed the 1995 triathlon was examined for changes in cTnT values. This study was approved by the Institutional Review Board
Results
Twenty-three subjects (11 men, age 33 ± 8 years, weight 76 ± 8 kg; 12 women, age 43 ± 14 years, weight 56 ± 5 kg) who participated in this study completed the 1994 triathlon with a mean time of 661 minutes (± 89 minutes). Mean completion time was shorter for men (586 ± 45 minutes vs 715 ± 71 minutes, p <0.0001). None of the participants had coronary or other forms of heart disease, hypertension, diabetes, or family history of premature coronary disease, and none were smokers.
The plasma
Discussion
Injury to the skeletal muscle in healthy individuals after strenuous exercise is well documented and may be the consequence of exercise-induced free radicals.9 Myoglobin and CK, present only in muscle cells, are increased following prolonged physical activity in both men and women.10, 11, 12 Both CK and myoglobin concentrations markedly increased in our subjects following the triathlon. However, despite the greater severity of this endurance exercise, these increases were comparable to those
Acknowledgements
We acknowledge Roche Diagnostics and Dade Behring for supplying the kits and instruments needed for the troponin assays, and Hewlett-Packard for echocardiographic equipment and technical assistance.
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