![]() Arterial and venous parameters were measured at 3-min pre-tilt in the supine position, and at 1 min before the end of the tilt. The cerebral (MCA), femoral (FEM) arterial flow velocity and leg vascular resistance (FRI), the portal vein section (PV), the flow redistribution ratios (MCA/FEM MCA/PV), the tibial (Tib), gastrocnemius (Gast), and saphenous (Saph) vein sections were measured by echography and Doppler ultrasonography. ![]() Subjects were identified as finisher (F) or non-finishers (NF) at the post-HDBR 20-min tilt test. ![]() Methods: Twenty-one males: 7 control (Con), 7 resistive vibration exercise (RVE) and 7 Chinese herb (Herb) were assessed. We quantified the impact of 60-day head-down bed rest (HDBR) with countermeasures on arterial and venous response to tilt.
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