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DOI: 10.1160/TH03-10-0644
Moderate-intensity exercise suppresses platelet activation and polymorphonuclear leukocyte interaction with surface-adherent platelets under shear flow in men
Financial support The study was support under the National Science Council Grant NSC 92-2314-B-182-021.Publication History
Received
23 October 2003
Accepted after revision
04 January 2003
Publication Date:
05 December 2017 (online)
![](https://www.thieme-connect.de/media/10.1055-s-00035024/200403/lookinside/thumbnails/10-1160-th03-10-0644-1.jpg)
Summary
The reciprocal modulation of platelet and polymorphonuclear leukocyte (PMN) activities is important in the pathogenesis of thrombosis and inflammation. This study investigated how moderate exercise affects shear-induced platelet activation and subsequent PMNs interaction with platelet-related thrombi under shear flow. Sixteen sedentary healthy men engaged in moderate exercise (about 60% V·O2max) on a bicycle ergometer. Platelet activation, PMNs interaction with surface-adherent platelets, and PMN-dependent inhibition of platelet activation under shear flow were measured both before and immediately after exercise. The results of this study can be summarized as follows: (1) moderate exercise was associated with lower extents of shear-induced platelet adhesion and aggregation, binding of von Willbrand factor (vWF) to platelets, and glycoprotein IIb/IIIa activation and P-selectin expression on platelet than at rest; (2) the velocity and percentage of rolling PMNs increased while the number of PMNs remaining bound to surface-adherent platelets decreased after moderate exercise; (3) although treating the PMNs with oxidized-low density lipoprotein (Ox-LDL) enhanced PMNs interaction with surface-adherent platelets, moderate exercise suppressed the enhancement of platelet-PMN interaction by Ox-LDL; (4) moderate exercise decreased platelet [Ca2+]i elevation induced by ADP and platelet [Ca2+]i levels mediated by PMN and Ox-LDL-treated PMN; and (5) plasma and PMN-derived nitric oxide metabolites and plasma vWF antigen and activity increased after moderate exercise, whereas plasma and platelet-derived soluble P-selectin levels remained unchanged in response to exercise. Therefore, we conclude that moderate-intensity exercise suppresses shear-induced platelet activation and subsequent PMNs adhesion to platelets deposited at sites of vascular injury under flow, thereby reducing the risks of vascular thrombosis and inflammation.
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