Altitude hypoxia increases glucose uptake in human heart

Chi Hsien Chen, Yuh Feng Liu, Shin Da Lee, Chih Yang Huang, Wen Chih Lee, Ying Lan Tsai, Chien Wen Hou, Yi Sheng Chan, Chia Hua Kuo

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Cardiac muscle is a highly oxygenated tissue that produces ATP mainly from fat oxidation. However, when the rate of oxygen demand exceeds oxygen supply, energy reliance on the carbohydrate substrate becomes crucial for sustaining normal cardiac function. In this study, the effect of acute altitude hypoxia on glucose uptake from circulation was determined, for the first time, in the human heart, using [18F]-2-deoxy-2-fluoro-D-glucose positron emission tomography (FDG-PET) in a simulated altitude condition (14% O2, corresponding to ∼3000 m above sea level) or room air (21% O2). Our results showed that subjects (n = 6) started to experience difficulty in sustaining the hypoxic condition at ∼45 min. This was concurrent with a substantially increased blood lactate concentration, which reflects an accelerated rate of anaerobic glycolysis. Hypoxia elevated FDG uptake above control by ∼70% in heart, but not in limbs (representing primarily skeletal muscle), brain, and liver. This study provides the first human evidence for the hypoxia-stimulated glucose uptake in heart. At this hypoxia level, the previously observed hypoxia-stimulated glucose uptake in rat skeletal muscle was not confirmed in the human study.

Original languageEnglish
Pages (from-to)83-86
Number of pages4
JournalHigh Altitude Medicine and Biology
Volume10
Issue number1
DOIs
Publication statusPublished - Mar 1 2009

Keywords

  • Altitude
  • Cardiac muscle
  • Glucose transport
  • Myocardium

ASJC Scopus subject areas

  • Medicine(all)
  • Physiology
  • Public Health, Environmental and Occupational Health

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