Taylor BA, et al. - Researchers probed the impact of oral contraceptive (OC) use and compression socks on hemostatic activation in women flying cross-country to and from a marathon. For analysis of thrombin-antithrombin complex (TAT), d-dimer, and tissue plasminogen activator (t-PA), venous blood samples were collected within 24 hours of arriving in Boston (EXPO), immediately after the marathon (RUN), and within 24 hours after a return flight home (Post-Flight). Disproportionately increased coagulation was not seen in female runners using OCs. Surprisingly, findings suggested greater increase in d-dimer after exercise with the use of compression socks in women on OCs.