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Effects of increased ventilation and improved pulmonary gas‐exchange on maximal oxygen uptake and power output
Author(s) -
Inbar O.,
Weinstein Y.,
Kowalski A.,
Epstein S.,
Rotstein A.
Publication year - 1993
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1111/j.1600-0838.1993.tb00367.x
Subject(s) - vo2 max , cycle ergometer , ventilation (architecture) , oxygen , cardiology , respiratory exchange ratio , respiration , work of breathing , respiratory system , medicine , breathing gas , respiratory minute volume , anaerobic exercise , zoology , physical therapy , anesthesia , chemistry , heart rate , breathing , physics , biology , blood pressure , anatomy , organic chemistry , thermodynamics
Recent reports suggest that aerobic performance at very high levels may be limited by the pulmonary system. The purpose of the present study was to compare respiratory functions at rest and during graded maximal aerobic exercise (cycle ergometry) between well‐trained (TR, n = 11) and untrained (UT, n = 14) individuals while breathing atmospheric air, normoxic helium (He) and oxygen‐enriched mixture. When the subjects breathed air, TR exhibited lower exercise ventilatory reserve (MVV‐VE max ), ratio between minute ventilation (VE) and oxygen uptake (V o 2 ) and SaO 2 than UT. Breathing HE resulted in an increase in VE and V o 2max in both groups but in an increased VE/V o 2 and SaO 2 and maximal mechanical cycle ergometer load, only in TR. Compared with air, breathing an oxygen‐enriched mixture resulted in increased peak exercise SaO 2 and maximal mechanical load in both groups. It is concluded that arterial O 2 desaturation secondary to a relative hypoventilatory response may limit V o 2max and aerobic performance capacity at high work levels.