This study tested the hypothesis that the initial rapid decrease in blood pressure during inactive recovery from exercise is due to lack of the skeletal muscle pump, which is an important mechanism for venous return during exercise. Six volunteers underwent 2 exercise sessions each consisting of a warm-up followed by 3 min of cycling at 60% of maximal heart rate (HR), followed by 5 min of recovery: 1) seated (inactive); or 2) loadless pedaling(active), in random order. Thirty min separated the 2 protocols. Arterial pressure (MAP, photoplethysmography), cardiac output (CO, Doppler echocardiography), thoracic impedance (TI) and HR were measured continuously during each bout of exercise. Total peripheral resistance (TPR) was calculated. Results: The changes from peak exercise to 1 min of recovery are shown below. MAP and CO decreased more and TI increased more during inactive recovery (*p<0.05).Table
Conclusion: These data suggest that engaging the skeletal muscle pump by loadless pedaling markedly improves the support of CO and MAP during recovery from moderate exercise.
E-22 POSTER CARDIOVASCULAR