Periodic cutaneous blood flow during postocclusive reactive hyperemia

Area of Science:

• Physiology
• Microcirculation
• Vascular Biology

Background:

• Cutaneous blood flow regulation is complex.
• Reactive hyperemia follows temporary ischemia.
• Oscillatory patterns in blood flow are not fully understood.

Purpose of the Study:

• To investigate the characteristics of cutaneous blood flow oscillations during reactive hyperemia.
• To determine the synchronicity of these oscillations in adjacent skin areas.

Main Methods:

• Laser Doppler velocimetry was used to continuously monitor forearm cutaneous blood flow.
• Measurements were taken in 10 healthy subjects before, during, and after brachial artery occlusion.
• Bilateral and closely spaced forearm sites were analyzed for synchronicity.

Main Results:

• Rhythmic oscillations in cutaneous blood flow were observed during reactive hyperemia.
• Oscillation amplitude peaked 30 seconds postocclusion and then declined.
• The mean period of oscillations was approximately 9.26 seconds.
• Progressive loss of synchronicity was noted between bilateral and adjacent skin sites.

Conclusions:

• Oscillations in cutaneous blood flow during reactive hyperemia are a normal physiological response.
• These oscillations are not synchronous in adjacent skin areas.
• The origin may be independent of sympathetic vasoconstrictor influences or due to nonuniform sympathetic activity.