Acute 30-minute cycling increased cutaneous microvascular axonal responses to local heating for up to 1 hour compared to baseline (P<0.01), with no difference between low and high intensities.
Does acute aerobic exercise improve cutaneous thermal hyperaemia in healthy young adults?
Acute aerobic exercise transiently augments cutaneous microvascular axonal responses to local heating for up to 1 hour, independent of exercise intensity, suggesting enhanced sensory afferent function.
p-value: p=<0.01
Little is known about the acute changes in cutaneous microvascular function that occur in response to exercise, the accumulation of which may provide the basis for beneficial chronic cutaneous vascular adaptations. Therefore, we examined the effects of acute exercise on cutaneous thermal hyperaemia. Twelve healthy, recreationally active participants (11 male, 1 female) performed 30-minute cycling at 50 % (low-intensity exercise, LOW) or 75 % (high-intensity exercise, HIGH) maximum heart rate. Laser Doppler flowmetry (LDF) and rapid local skin heating were used to quantify cutaneous thermal hyperaemia before (PRE), immediately following (IMM) and 1-h (1HR) after exercise. Baseline, axon reflex peak, axon reflex nadir, plateau, maximum skin blood flow responses to rapid local heating (42 °C for 30-min followed by 44 °C for 15-min) at each stage were assessed and indexed as cutaneous vascular conductance CVC = flux / mean arterial blood pressure (MAP), PU·mm Hg−1, and expressed as a percentage of maximum (%CVCmax). Exercise increased heart rate (HR), MAP and skin blood flow (all P < 0.001), and to a greater extent during HIGH (all P < 0.001). The axon reflex peak and nadir were increased immediately and 1-h after exercise (all comparisons P < 0.01 vs. PRE), which did not differ between intensities (peak: P = 0.34, axon reflex nadir: P = 0.91). The endothelium-dependent plateau response was slightly elevated after exercise (P = 0.06), with no effect of intensity (P = 0.58) nor any interaction effect (P = 0.55). CONCLUSION: Exercise increases cutaneous microvascular axonal responses to local heating for up to 1-h, suggesting an augmented sensory afferent function post-exercise. Acute exercise may only modestly affect endothelial function in cutaneous microcirculation.
Thomas et al. (Mon,) conducted a other in Healthy (n=12). Acute aerobic exercise (30-minute cycling) vs. Baseline (PRE) was evaluated on Cutaneous thermal hyperaemia (axon reflex peak and nadir) (p=<0.01). Acute 30-minute cycling increased cutaneous microvascular axonal responses to local heating for up to 1 hour compared to baseline (P<0.01), with no difference between low and high intensities.