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- Title
Exercise Induced Cardiac Fatigue Following Prolonged Exercise in Road Cyclists.
- Authors
Wyatt, Frank; Pawar, Ganesh
- Abstract
The purpose of this study was to examine cardiac function following a 100-mile ride in high ambient temperatures by healthy, competitive cyclists. Methods: Subjects were six (n=6) competitive cyclists racing in a 100-mile road race. Measures (pre/post) included: body mass (kg); E:A ratio (ventricular compliance); stroke volume (ml); ejection fraction (%) through echocardiography; age (y); training status (hrs*week-1); years of racing experience (YE); race finish time (hrs); height (cm); mean race heart rate (b*min-1), and post race blood troponin I (cTnI) to assess myocyte damage. Results: subject means (±SE) were the following: age, 24.2 (1.2) y; height, 181.1 (5.5) cm; training status, 18 (2.4) hrs*week-1; racing experience, 5.8 (4.6) y; race heart rate,159.3 (3.9) b*min-1; pre/ post E:A ratio, 2.04(.41)/ 1.27(.39); pre/post stroke volume, 98.6 (21.6)/ 72.6(11.8) ml*min-1; cTnI, 0.13 (.15); ejection fraction pre/post, 67.3 (3.8)/ 65.1(2.2)%; finish time 4.05 (0.54) hrs. Significant (p< 0.05) differences were determined pre/post for E:A ratio, stroke volume, and pre/post body mass, 76.4 (5.9)/ 72.4 (1.8) kg. cTnI was elevated above established levels of 0.03 ng*ml-1 for cellular disruption. Conclusion: The differences in E:A ratio (i.e., ventricular compliance), stroke volume and elevated cTnI indicate reduced cardiac function indicative of cardiac fatigue.
- Subjects
FATIGUE (Physiology); EXERCISE physiology; CLINICAL exercise physiology; EXERCISE therapy; CYCLIST physiology; CARDIAC patients; PHYSIOLOGY
- Publication
ICHPER-SD Journal of Research in Health, Physical Education, Recreation, Sport & Dance, 2011, Vol 6, Issue 2, p61
- ISSN
1930-4595
- Publication type
Article