Abstract
Rotation thrombelastography (ROTEM) provides a whole blood assay that allows the assessment of plasmic- and platelet-related hemostasis in a single-step procedure. In our current study, we focused on the capability of the method to detect hemostatic alterations induced by physical exercise, enrolling 33 healthy participants of the Dusseldorf Marathon 2006. Venous blood drawn immediately before and after finishing the marathon was analyzed by a rotational thrombelastograph (Pentapharm, Munich, Germany). On initiation of blood coagulation by recalcification, standard ROTEM parameters were determined. Comparison of the results obtained before and after the physical exercise was performed using the Student t test for paired samples. As a result, the mean clotting time (CT) determined from blood samples obtained immediately after the marathon was significantly shorter (662.9 ± 67.8 seconds vs 505.6 ± 97.3 seconds, P = .002) and the mean maximal clot firmness was significantly broader (48.4 ± 6.6 mm vs 51.5 ± 4.5 mm, P = .0004) when compared to results obtained before the physical exercise. Differences between mean clot formation times (CFTs; 280.6 + 96 seconds vs 270.4 ± 73.8 seconds) and mean α angles (45.9° ± 8° vs 47.8° ± 5.8°) before and after the marathon were not statistically significant. Remarkably, some participants showed opposed results, particularly prolongation of CT and narrowing of maximum clot firmness (MCF). Our study demonstrates that ROTEM is sensitive to exercise-induced hemostatic alterations. The method appears to be capable of detecting even distinct changes in hemostasis in a single-step procedure. Further analyses are needed to clarify which hemostasis parameters influence ROTEM results and which ROTEM results are independent predictors of exercise-induced alterations of plasmic and platelet function. This might help to explain interindividual differences in exercise-induced alterations of hemostasis.