Fig. 2
From: Human cerebrovascular function in health and disease: insights from integrative approaches
Systemic arterial blood pressure and cerebral blood flow velocity responses to air rebreathing. Note the increase in cerebral blood flow velocity (third panel) in response to increasing end-tidal CO2 (first panel) without any apparent increase in arterial blood pressure. Bottom panel shows the change in cerebrovascular conductance (i.e., flow/pressure; to account for any change in pressure, which can alter cerebral blood flow independently) during two separate trials of air rebreathing by the same subject