THE REPRODUCIBILITY OF LIMB BLOOD-FLOW MEASUREMENTS IN HUMAN VOLUNTEERS AT REST AND AFTER EXERCISE BY USING MERCURY-IN-SILASTIC STRAIN-GAUGE PLETHYSMOGRAPHY UNDER STANDARDIZED CONDITIONS

1. A study to assess the reproductivity of limb blood flow measurements by venous occlusion plethysmography using mercury-in-Silastic strain gauges was performed in six normal volunteers under standardized conditions. 2. Using this technique forearm and calf blood flow were measured at rest and between 2 and 3 min after submaximal exercise of six separate occasions over a 1 month period. 3. The mean coefficient of variation for resting forearm blood flows was 10.5% (range 7.8-15.6%). 4. The mean coefficient of variation for resting calf blood flow was 11.5% (range 7.4-14.2%). 5. The mean coefficient of variation for post-exercise calf blood flow was 13% (range 11.5-16.4%). 6. The results suggest that limb blood flow measurement by this technique may be useful in studies where serial measurements are required.