pH Heterogeneity in skeletal muscle extracellular fluid

F. Sjöberg, P. Thorborg, N. Lund

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Oxygen and carbon dioxide are known to be heterogeneously distributed in tissues. Extracellular skeletal muscle tissue pH (pHt) also exhibits a spatial variability in vitro, but this has not been examined in vivo. pHt distributions in resting skeletal muscle and the effect of the dispersion of pHt on ischemia and normoxic hypercarbia was therefore studied in an animal model with a multichannel pH microelectrode. Under resting conditions and spontaneous breathing, local pHt (from all animals, n = 10) was found to vary between 6.96 and 7.68 (range), and 70% of the values were withina pH of 7.00-7.32. In each animal the maximum pHt differences (maximum range between the 6 channels of the microelectrode) found were 0.32 ± 0.11 pH units (mean ± SD).During tissueacidosis, induced by ischemia, no significant change in the local pHt differences in each animal was seen. During normoxic hypercarbia a 2-fold increase in pHt variability within each animal was noticed (p < 0.01), which suggests thatcarbon dioxide and buffering effects of the blood are significant factors for the pHt distribution. The pHt distribution range found is of similar magnitude as previouslydescribed in in vitro studies on skeletal muscle. Locally varying pHt levels may be of importance as they will affectcellular H+ extrusion, membrane potential and volume control of different cell populations differently.

Original languageEnglish (US)
Pages (from-to)180-186
Number of pages7
JournalInternational Journal of Microcirculation-Clinical and Experimental
Issue number4
StatePublished - Jan 1 1996
Externally publishedYes


  • Acidosis
  • Hypercarbia
  • Ischemia
  • Microelectrode
  • Monocrystalline antimony
  • pH distribution

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine


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