Figure 4. Haemodynamic responses during exercise and isocapnic, resting hyperpnoea.

Mean arterial blood pressure (A), systemic vascular conductance (B), intercostal muscle vascular conductance (C) and quadriceps muscle vascular conductance (D) at different levels of minute ventilation during exercise (open triangles) and isocapnic, resting hyperpnoea (filled triangles). Values are means ±s.e.m. for 10 subjects. Asterisks denote significant differences between exercise and hyperpnoea tests; crosses denote significant differences compared to maximal ventilation, P < 0.05.