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Bioactive nitric oxide concentration does not increase during reactive hyperemia in human skin
J L Zhao1, P E Pergola, L J Roman
1Division of Geriatrics and Gerontology, Department of Medicine, University of Texas Health Science Center at San Antonio, San Antonio, Texas 78229, USA.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|January 13, 2004
Summary
Reactive hyperemia (RH) increases forearm skin blood flow (SkBF) without a measurable rise in nitric oxide (NO). This suggests NO is not essential for the cutaneous vascular response to RH in healthy individuals.
Area of Science:
- Physiology
- Vascular Biology
- Cutaneous Microcirculation
Background:
- Nitric oxide (NO) plays a crucial role in regulating vascular tone and blood flow.
- Reactive hyperemia (RH) is a well-established physiological response involving increased blood flow following a period of reduced perfusion.
Purpose of the Study:
- To investigate the involvement of nitric oxide (NO) in the human forearm's cutaneous response to reactive hyperemia (RH).
Main Methods:
- Healthy volunteers underwent forearm occlusion to induce RH.
- Skin blood flow (SkBF) was measured using Laser-Doppler flowmetry.
- Cutaneous nitric oxide (NO) concentrations were monitored using a selective amperometric electrode.
- Acetylcholine (ACh) was administered via microdialysis to validate the NO detection system.
Main Results:
- RH caused an immediate and significant increase in SkBF post-occlusion.
- No significant changes in cutaneous NO levels were observed during the RH-induced increase in SkBF.
- Acetylcholine administration successfully increased both SkBF and NO levels, confirming system responsiveness.
Conclusions:
- The study concludes that the increase in forearm SkBF during RH is mediated by mechanisms independent of a measurable increase in cutaneous nitric oxide.
- These findings indicate that NO is not a primary mediator of the vascular response to reactive hyperemia in human skin.