nine male subjects 20 to 40 years of age consented to have regional cutaneous blood flow measured in the index finger via a laser doppler flowmeter ( ldf ) and blood cell velocity ( cbv ) measured in individual nailfold capillaries via video microscopy while placing the hand 20 then 40 cm below the heart and while a pneumatic cuff placed around the wrist was inflated to pressures of 20 , 40 than 60 mm hg .
C0230388
index finger
C0018563
hand