Local cooling reduces skin ischemia under surface pressure in rats: An assessment by wavelet analysis of laser Doppler blood flow oscillations

Yih Kuen Jan, Bernard Lee, Fuyuan Liao, Robert D. Foreman

Research output: Contribution to journalArticlepeer-review

Abstract

The objectives of this study were to investigate the effects of local cooling on skin blood flow response to prolonged surface pressure and to identify associated physiological controls mediating these responses using the wavelet analysis of blood flow oscillations in rats. Twelve Sprague-Dawley rats were randomly assigned to three protocols, including pressure with local cooling (Δt =10°C), pressure with local heating (Δt = 10°C) and pressure without temperature changes. Pressure of 700 mmHg was applied to the right trochanter area of rats for 3h. Skin blood flow was measured using laser Doppler flowmetry. The 3h loading period was divided into non-overlapping 30min epochs for the analysis of the changes of skin blood flow oscillations using wavelet spectral analysis. The wavelet amplitudes and powersof three frequencies (metabolic, neurogenic and myogenic) of skin blood flow oscillations were calculated. The results showed that after an initial loading period of 30min, skin blood flow continually decreased under the conditions of pressure with heating and of pressure without temperature changes, but maintained stable under the condition of pressure with cooling. Wavelet analysis revealed that stable skin blood flow under pressure with cooling was attributed to changes in the metabolic and myogenic frequencies. This study demonstrates that local cooling may be useful for reducing ischemia of weight-bearing soft tissues that prevents pressure ulcers.

Original languageEnglish (US)
Pages (from-to)1733-1745
Number of pages13
JournalPhysiological Measurement
Volume33
Issue number10
DOIs
StatePublished - Oct 2012

Keywords

  • cooling
  • heating
  • laser Doppler
  • pressure ulcers
  • wavelet

ASJC Scopus subject areas

  • Biophysics
  • Physiology
  • Biomedical Engineering
  • Physiology (medical)

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