Intervention: one leg of each person was randomly assigned to deep transverse friction session, the other leg was used as a control leg. Friction was applied continuously for a total of 15 minutes. Measurements: the microcirculation was determined at 2 and 8 tissue depths at the distal and the proximal midportion of the Achilles tendon. For each level, the capillary blood flow, the tissue oxygen saturation, and the postcapillary venous filling pressure was registered.