Exercise-induced oxyhemoglobin desaturation and pulmonary diffusing capacity during high-intensity exercise

European Journal of Applied Physiology and Occupational Physiology
R A TurcotteH Perrault

Abstract

The purpose of this investigation was to examine if exercise-induced arterial oxyhemoglobin desaturation selectively observed in highly trained endurance athletes could be related to differences in the pulmonary diffusing capacity (DL) measured during exercise. The DL of 24 male endurance athletes was measured using a 3-s breath-hold carbon monoxide procedure (to give DLCO) at rest as well as during cycling at 60% and 90% of these previously determined VO2max. Oxyhemoglobin saturation (SaO2%) was monitored throughout both exercise protocols using an Ohmeda Biox II oximeter. Exercise-induced oxyhemoglobin desaturation (DS) (SaO2% < 91% at VO2max) was observed in 13 subjects [88.2 (0.6)%] but not in the other 11 nondesaturation subjects [NDS: 92.9 (0.4)%] (P < or = 0.05), although VO2max was not significantly different between the groups [DS: 4.34 (0.65) l/min vs NDS: 4.1 (0.49) l/min]. At rest, no differences in either DLCO [ml CO.mmHg-1.min-1: 41.7 (1.7) (DS) vs 41.1 (1.8) (NDS)], DLCO/VA [8.2 (0.4) (DS) vs 7.3 (0.9) (NDS)], MVV [l/min: 196.0 (10.4) (DS) vs 182.0 (9.9) (NDS)] or FEV1/FVC [86.3 (2.2) (DS) vs 82.9 (4.7) (NDS)] were found between groups (P > or = 0.05). However, VE/VO2 at VO2max was lower in the DS group [33.0 (1....Continue Reading

Citations

Oct 20, 1998·Acta Physiologica Scandinavica·H B NielsenN H Secher
Jul 31, 2001·British Journal of Sports Medicine·A J Carlisle, N C Sharp
Jul 25, 2000·Sports Medicine·C PrefautC Caillaud
Nov 18, 2003·Scandinavian Journal of Medicine & Science in Sports·Henning Bay Nielsen
Mar 5, 2003·Clinics in Sports Medicine·Jonathon Truwit
Oct 20, 1999·Medicine and Science in Sports and Exercise·O HueC Prefaut
Nov 18, 2000·Medicine and Science in Sports and Exercise·P A DerchakR F Chapman

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