Regular Exercise and Subclinical Myocardial Injury During Prolonged Aerobic Exercise
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To the Editor: Physicians increasingly are encouraged to prescribe moderate or vigorous intensity physical activity for their patients.1 However, prolonged aerobic exercise may cause myocardial damage manifested immediately after exercise as a rise in cardiac troponin T (cTnT) and cardiac troponin I levels and wall motion abnormalities detected by echocardiography.2 We conducted a study to determine whether modest physical activity is sufficient to protect against subclinical myocardial injury caused by excessive exercise.
Methods
We used the Revised Physical Activity Readiness Questionnaire for screening subjects before they competed.3 We also asked subjects about their quantity and intensity of physical activity during the past year. Blood samples were collected from 36 athletes (34 men, 2 women; mean [SD] age 38.9 [6.2] years; none with cardiovascular disease risk factors) 24 hours before and 2 hours after an Alpine marathon and an Alpine cross-country marathon, respectively. The start and finish of the marathon is in . . . [Full Text of this Article]
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