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1 Department of Internal Medicine, Krankenhaus Barmherzige Brueder, Graz, Austria
2 Department of Medical Informatics, Technical University, Graz, Austria
* To whom correspondence should be addressed. E-mail: falko.skrabal{at}meduni-graz.at.
Purpose: We hypothesized that the extreme endurance exercise of an Ironman competition would lead to long standing hemodynamic and autonomic changes. We investigated also the possibility of predicting competition performance from baseline hemodynamic and autonomic parameters. Methods: We have investigated 27 male athletes before competition, one hour after and then for the following week after the competition. The Task ForceTM monitor was used to measure beat-to-beat hemodynamic and autonomic parameters during supine rest and active standing. Results: Heart rate (P<0.001) was increased, stroke index (P=0.011), systolic blood pressure (P=0.004), diastolic blood pressure (P<0.001), total peripheral resistance index (P<0.001), and baroreceptor reflex sensitivity (P<0.001) were decreased after the competition. The 0.05-0.17Hz band of heart rate and blood pressure variability was increased (P<0.001 and P<0.001, respectively), the 0.17-0.40Hz band of heart rate interval variability was decreased after the competition (P<0.001). All parameters returned to base line values three days after the competition. After the competition the autonomic response to orthostasis was significantly impaired. The 0.05-0.17Hz band of diastolic blood pressure variability (DBPLFnu) before competition and weekly net exercise training, but not the other hemodynamic and autonomic parameters, were related to competition time in multivariate regression analysis (multiple r=0.70, p<0.001). Conclusions: The marked hemodynamic and autonomic changes after an ultra-endurance race which are compatible with myocardial depression in face of sympathetic activation and reduction of afterload return to baseline after only one to three days. Since DBPLFnu contributes to the prediction of competition time, the analysis of blood pressure variability in the frequency domain deserves further study for the prediction of endurance capacity.
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