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- W49105439 abstract "Myocytolysis and muscular involvement associated with endurance exercise are particularly pronounced when the effort is performed in altitude. The skeletal muscle lesion is proven by the release of enzymes and other muscular components into the bloodstream and this is proportional to the amount and length of effort. The hypothesis that the heart muscle can be involved as well has not been unequivocally proven. The aim of this study, whose experimental model is that of a long-lasting endurance race in mountain, was to correlate hemodynamic variations with circulating and systemic modifications. Twenty-two well-trained endurance athletes (mean age 37.6 ± 8.4 years) performed a 30-km race at 869-2522 m. The day before and immediately after the race, each athlete underwent blood letting, echocardiogram, blood pressure measurement in triplicate, and leg and forearm strain-gauge plethysmography. Creatine kinase and its MB fraction, myoglobin and cardiac troponin I increased significantly after the run. Cardiac tropanin T also increased, not reaching statistical significance. Alkaline phosphatase increased but the alkaline/hematocrit ratio was unchanged. Lactate dehydrogenase and aspartate aminotransferase were increased after the race, while alanine aminotransferase and gamma glutamyltransferase did not change. Systolic and diastolic blood pressure decreased by 9.9% and 16.5%, respectively, while heart rate was 33% higher. No echocardiographic variation was found, so that cardiac output increase (+31.6%) entirely depended on heart rate increase. Leg resistance decreased after the race by 30%, together with a 49% increase in arterial flow. Forearm flow resistance trends paralleled those of leg. In the multiple regression adjusted for confounders, exercise-related leg flow increase directly correlated with creatine kinase increase. In conclusion, long-lasting endurance exercise in altitude produces a release of great amount of myocytolysis enzymes and a blood pressure reduction completely attributable to peripheral vasodilation." @default.
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- W49105439 date "1999-10-20" @default.
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- W49105439 title "Hemodynamic and systemic consequences of a 30-km endurance race in altitude" @default.
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