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Departamento de Ciencias Fisiológicas, Instituto de Investigaciones de la Altura, Universidad Peruana Cayetano Heredia, Lima 100, Peru; and University Laboratory of Physiology, Oxford OX1 3PT, United Kingdom
Received 3 October 1995; accepted in final form 21 May 1996.
León-Velarde, Fabiola, Manuel Vargas, Carlos Monge-C.,
Robert W. Torrance, and Peter A. Robbins. Alveolar
PCO2 and
PO2 of high-altitude natives living
at sea level. J. Appl.
Physiol. 81(4): 1605-1609, 1996.
This
study was designed to determine whether subjects born at high altitude
(HA; 2,000 m or above) who subsequently move to near sea level (SL)
develop end-tidal PCO2
(PETCO2) and
PO2
(PETO2) values
that equal those of SL natives living near SL. A total of 108 male HA
natives living near SL were identified by survey of a district in Lima,
Peru, and a further 108 male SL natives from the same district were
identified as control subjects. Of these subjects, satisfactory data
for inclusion in the study were obtained from 93 HA and 82 SL subjects.
Mean PETCO2 and PETO2 values were 37.7 ± 2.5 (SD) and 104.7 ± 3.2 Torr, respectively, in HA subjects and
37.7 ± 2.2 and 104.8 ± 3.0 Torr, respectively, in SL subjects.
The average difference between SL natives and HA natives for
PETCO2 was 0.07 Torr
(
0.64 to 0.78; 95% confidence interval) and for
PETO2 was 0.05 Torr
(0.89 to 0.99, 95% confidence interval). The average age and
weight of the SL and HA subjects did not differ, but the HA subjects
were shorter and tended to have larger vital capacities, consistent
with their origin at HA. We conclude that the
PETCO2 and
PETO2 near SL of SL natives
and HA natives do not differ.
partial pressure of carbon dioxide; partial pressure of oxygen; end-tidal partial pressure of carbon dioxide; control of breathing; peripheral chemoreceptors; Andean; ventilation
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F. Leon-Velarde, A. Gamboa, M. Rivera-Ch, J.-A. Palacios, and P. A. Robbins Plasticity in Respiratory Motor Control: Selected Contribution: Peripheral chemoreflex function in high-altitude natives and patients with chronic mountain sickness J Appl Physiol, March 1, 2003; 94(3): 1269 - 1278. [Abstract] [Full Text] [PDF]
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M. Vargas, F. Leon-Velarde, C. Monge-C., J.-A. Palacios, and P. A. Robbins Similar hypoxic ventilatory responses in sea-level natives and high-altitude Andean natives living at sea level J Appl Physiol, March 1, 1998; 84(3): 1024 - 1029. [Abstract] [Full Text] [PDF]
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