PMID: 8970147Dec 1, 1996Paper

A new method for monitoring hydration at high altitude by bioimpedance analysis

Medicine and Science in Sports and Exercise
A PiccoliMarco Zaccaria

Abstract

Our study evaluated the performance of a graphical method for monitoring the fluid variation at high altitude in seven adult Caucasian male subjects (average age 25 yr, average height 177 cm). The graphical approach is called the Resistance-Reactance (RXc) graph method and is based on standard bioimpedance analysis (tetrapolar, 50 kHz frequency). Measurements were taken at sea level before the expedition, at 5050 m after 1 wk and 3 wk, and again at sea level after descent. Plasma and urine electrolytes, osmolalities, and the free-water clearance were determined by standard methods. All climbers had baseline impedance vectors within the reference 95% tolerance ellipse for the Italian male population. The high altitude dehydration caused a significant lengthening of vectors, which after descent underwent a significant shortening and returned close to the baseline values. Average urine volume increased by 1.4 l.d-1 in the first week and average body weight decreased by 4.4 kg after 3 wk. The RXc graph method could be useful in the planning of the individual climber's appropriate dehydration and fluid intake at altitude since a feedback control of the hydration is allowed without any assumption of body composition.

References

Oct 1, 1992·Scientific American·C S Houston
Nov 1, 1992·The American Journal of Clinical Nutrition·R F KushnerL Danford
Jun 1, 1992·Journal of Applied Physiology·C S FulcoA Cymerman
Jan 1, 1991·European Journal of Applied Physiology and Occupational Physiology·E A KollerM B Vallotton
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May 1, 1994·Sports Medicine·S I BarrS M Crawford
Feb 1, 1994·Medicine and Science in Sports and Exercise·J A Krasney

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Citations

Apr 20, 2005·JPEN. Journal of Parenteral and Enteral Nutrition·Antonio PiccoliLorenza Caregaro
Aug 21, 2014·European Journal of Clinical Nutrition·R BuffaE Marini
Nov 25, 2014·The British Journal of Nutrition·Stephanie BaronGerard Friedlander
Nov 14, 2003·American Journal of Physical Anthropology·Manuela Dittmar
Aug 13, 2002·Current Opinion in Clinical Nutrition and Metabolic Care·Stavros A Kavouras
Sep 10, 2013·PloS One·Hannes GattererMartin Burtscher
Jan 25, 2012·European Eating Disorders Review : the Journal of the Eating Disorders Association·Verena HaasBurghard Klapp
Jun 3, 2021·International Journal of Environmental Research and Public Health·Ivo B RegliHannes Gatterer
Feb 12, 2004·Kidney International·Antonio Piccoli, UNKNOWN Italian CAPD-BIA Study Group

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