Reflex sympathetic vasoconstriction can attenuate the reactive hyperaemic response following circulatory occlusion.
Sympathetic tone may confound reactive hyperemia measures in vascular testing; leaves open its modulation in disease states.
The intense reflex sympathetic vasoconstriction of forearm vessels induced by exposure of the parts of the body distal to the xiphisternum to pressures 60 mm Hg below atmospheric is able to reduce the reactive hyperaemia that follows a period of occlusion of the forearm circulation. Following occlusion for periods of from 15 sec to 8 min, the duration of the reactive hyperaemia, the peak flow, and the excess blood flow were reduced.
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Ardill et al. (1967) studied this question.
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