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Arterial haemoglobin oxygen saturation is affected by F 1 O 2 at submaximal running velocities in elite athletes
Author(s) -
Peltonen J. E.,
Leppävuori A. P.,
Kyrö K. P.,
Mäkelä P.,
Rusko H. K.
Publication year - 1999
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.1600-0838.1999.tb00244.x
Subject(s) - hyperoxia , hypoxia (environmental) , elite athletes , vo2 max , oxygen , medicine , room air distribution , treadmill , ventilatory threshold , cardiology , zoology , heart rate , anesthesia , chemistry , physical therapy , blood pressure , athletes , lung , biology , physics , organic chemistry , thermodynamics
This study was conducted to determine whether arterial desaturation would occur at submaximal workloads in highly trained endurance athletes and whether saturation is affected by the fraction of oxygen in inspired air (F 1 O 2 ). Six highly trained endurance athletes (5 women and 1 man, aged 25 ± 4 yr, VO 2max 71.3 ± 5.0 ml · kg −1 · min −1 ) ran 4 × 4 min on a treadmill in normoxia (F 1 O 2 0.209), hypoxia (F 1 O 2 0.155) and hyperoxia (F 1 O 2 0.293) in a randomized order. The running velocities corresponded to 50, 60, 70 and 80% of their normoxic maximal oxygen uptake (VO 2max ). In hypoxia, the arterial haemoglobin oxygen saturation percentage (SpO 2 %) was significantly lower than in hyperoxia and normoxia throughout the test, and the difference became more evident with increasing running intensity. In hyperoxia, the Sp 2 % was significantly higher than in normoxia at 70% running intensity as well as during recovery. The lowest values of SpO 2 % were 94.0±3.8% ( P <0.05, compared with rest) in hyperoxia, 91.0±3.6% ( P <0.001) in normoxia and 72.8 ± 10.2% ( P <0.001) in hypoxia. Although the SpO 2 % varied with the F 1 O 2 , the VO 2 was very similar between the trials, but the blood lactate concentration was elevated in hypoxia and decreased in hyperoxia at the 70% and 80% workloads. In conclusion, elite endurance athletes may show an F 1 O 2 ‐dependent limitation for arterial O 2 saturation even at submaximal running intensities. In hyperoxia and normoxia, the desaturation is partly transient, but in hypoxia the desaturation worsens parallel with the increase in exercise intensity.