Exercise responses after altitude acclimatization are retained during reintroduction to altitude

Medicine and Science in Sports and Exercise
Beth A BeidlemanA Cymerman

Abstract

Following 2 to 3 wk of altitude acclimatization, ventilation is increased and heart rate (HR), plasma volume (PV), and lactate accumulation ([La]) are decreased during submaximal exercise. The objective of this study was to determine whether some degree of these exercise responses associated with acclimatization would be retained upon reintroduction to altitude (RA) after 8 d at sea level (SL). Six male lowlanders (X +/- SE; 31 +/- 2 yr, 82.4 +/- 4.6 kg) exercised to exhaustion at the same relative percentages of peak oxygen uptake (VO2peak) at SL, on acute altitude (AA) exposure, after a 16-d chronic altitude (CA) exposure on Pikes Peak (4,300 m), and during a 3- to 4-h RA in a hypobaric chamber (4,300 m; 446 mm Hg) after 8 d at SL. The submaximal exercise to exhaustion time (min) was the same at SL (66.0 +/- 1.6), AA (67.7 +/- 7.3), CA (79.9 +/- 6.2), and RA (67.9 +/- 1.9). At 75% VO2peak: (1) arterial oxygen saturation (SaO2) increased from AA to CA (67.0 +/- 1.5 vs 78.5 +/- 1.8%; P < 0.05) and remained increased at RA (77.0 +/- 2.0%); (2) HR decreased from SL to CA (171 +/- 6 vs 152 +/- 9 beats x min-1; P < 0.05) and remained decreased at RA (157 +/- 5 beats x min-1); (3) calculated PV decreased 6.9 +/- 10.0% at AA, 21.3 +/...Continue Reading

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Citations

May 11, 2000·Journal of Interferon & Cytokine Research : the Official Journal of the International Society for Interferon and Cytokine Research·D V PyneJ A Smith
Jun 14, 2006·European Journal of Applied Physiology·Laurent SchmittJean-Paul Richalet
Jun 2, 2009·High Altitude Medicine & Biology·Paolo CerretelliClaudio Marconi
Jul 15, 2017·Journal of Applied Physiology·Beth A BeidlemanStephen R Muza
Dec 16, 2003·High Altitude Medicine & Biology·Marieke PronkPeter D Wagner
May 8, 2008·Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme·Andrew William Sheel, Meaghan Joelle Macnutt
May 7, 2019·Frontiers in Physiology·Tobias DünnwaldWolfgang Schobersberger
Apr 27, 2010·Journal of Sports Sciences·Martin FaulhaberMartin Burtscher
Sep 25, 2009·High Altitude Medicine & Biology·Beth A BeidlemanAllen Cymerman
Mar 26, 2014·International Journal of Sports Physiology and Performance·Raphael FaissGrégoire P Millet
Feb 28, 2017·Military Medical Research·Tirthankar ChatterjeeDhurjati Majumdar
May 7, 2015·High Altitude Medicine & Biology·Martin BurtscherAxel Kleinsasser
Dec 6, 2018·High Altitude Medicine & Biology·Beth A BeidlemanStephen R Muza
Jul 24, 2020·International Journal of Environmental Research and Public Health·Benedikt TremlMartin Burtscher
Sep 7, 2007·Medicine and Science in Sports and Exercise·Randall L Wilber
Jul 1, 2010·High Altitude Medicine & Biology·Stephen R MuzaCharles S Fulco
Jan 19, 2012·European Journal of Applied Physiology·Meaghan J MacNuttA William Sheel
Feb 14, 2021·Sensors·Tobias DünnwaldMartin Burtscher

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