Relationship between individual ventilatory response and acute renal water excretion at high altitude

Gabriele Valli, Daniela Bonardi, Federica Campigotto, Valter Fasano, Alessandra Gennari, Luca Pomidori, Annalisa Cogo, Paolo Palange

Research output: Contribution to journalArticle

Abstract

We tested the hypothesis that the individual ventilatory adaptation to high altitude (HA, 5050 m) may influence renal water excretion in response to water loading. In 8 healthy humans (33 ± 4 S.D. years) we studied, at sea level (SL) and at HA, resting ventilation (over(V, ̇)E), arterial oxygen saturation (S pO2), urinary output after water loading (WL, 20 mL/kg), and total body water (TBW). Ventilatory response to HA was defined as the difference in resting over(V, ̇)E over S pO2 (Δ over(V, ̇)E / Δ S pO2) from SL to HA. At HA, a significant increase in urinary volume after the first hour from WL (%WLt(0-60)) was observed. Significant correlations were found between Δ over(V, ̇)E / Δ S pO2 versus %WLt(0-60) at HA and versus changes in TBW, from SL to HA. In conclusion, in healthy subjects the ventilatory response to HA influences water balance and correlates with kidney response to WL. A higher ventilatory response at HA, allowing a more efficient water renal handling, is likely to be a protective mechanisms from altitude illness.

Original languageEnglish
Pages (from-to)103-108
Number of pages6
JournalRespiratory Physiology and Neurobiology
Volume162
Issue number2
DOIs
Publication statusPublished - Jul 31 2008

Keywords

  • Hypobaria
  • Hypoxia
  • Kidney
  • Ventilation
  • Water excretion

ASJC Scopus subject areas

  • Physiology
  • Pulmonary and Respiratory Medicine
  • Neuroscience(all)

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