the study was carried out on 17 healthy males aged 20-27 years subjected for 15 minutes to submaximal effort on a cycle ergometer ( elema-schonander ) under conditions of breathing ambient atmospheric air or a helium-oxygen mixture ( 20 % o2 + 80 % he ) and under hypobaric pressure simulating an altitude of 3500 m above sea level .
C1875235
helium-oxygen
C0030054
o2