Is Exercise-Induced Arterial Hypoxemia in Triathletes Dependent on Exercise Modality ?

Abstract : To determine whether exercise modality affects arterial hypoxemia (EIAH) during training-intensity exercise, 13 triathletes performed 20 min of cycling (C) followed by 20 min of running (R): C-R, and two weeks later, 20 min of R followed by 20 min of C:R-C. Each trial was performed at an intensity slightly above the ventilatory threshold and close to the daily training intensity (75 % of VO2max). Ventilatory data were collected continuously using an automated breath-by-breath system. Partial pressure of oxygen in arterial blood (PaO2) was measured after each C and R segment and arterial oxyhemoglobin saturation (SpO2) was monitored continuously via pulse oximetry. The metabolic rate was similar across modalities and trials, i.e., C-R (53.8 +/- 3.8 vs. 51.1 +/- 5.3 ml.min(-1).kg(-1)) and R-C (52.2 +/- 4.5 vs. 53.2 +/- 4.6 ml.min(-1).kg (-1)). EIAH showed significantly greater severity for R compared to C irrespective of the order (p < 0.05 for both trials). R values of PaO2 (and SpO2) for C-R and R-C were 88.7 +/- 6.0 mm Hg (93.0 +/- 0.6 % SpO2) and 86.6 +/- 7.3 mm Hg (93.5 +/- 0.6 % SpO2) and C values were 93.7 +/- 8.4 mm Hg (95.4 +/- 0.4 % SpO2) and 91.4 +/- 5.4 mm Hg (94.8 +/- 0.3 % SpO2). R ventilatory data described a significantly different breathing pattern than C, with higher respiratory rate (35.9 b.min(-1) vs. 51.1 b.min(-1) for C-R, p < 0.01; and 50.0 b.min(-1) vs. 41.5 b.min(-1) for R-C, p < 0.01) and lower tidal volume (2636 ml vs. 2282 ml for C-R, p < 0.02 and 2272 ml vs. 2472 ml for R-C, p < 0.05). We concluded that EIAH was greater during running than cycling for a similar metabolic rate corresponding to training intensity and that EIAH could thus be considered dependent on exercise modality.
Type de document :
Article dans une revue
Internation Journal of Sports Medicine, 2005, 26 (9), pp.719-726
Liste complète des métadonnées

Littérature citée [36 références]  Voir  Masquer  Télécharger

https://hal.univ-antilles.fr/hal-00720806
Contributeur : Pamphile Isch <>
Soumis le : mercredi 25 juillet 2012 - 17:51:45
Dernière modification le : jeudi 21 décembre 2017 - 13:28:03
Document(s) archivé(s) le : vendredi 16 décembre 2016 - 03:21:32

Fichier

sm290.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

  • HAL Id : hal-00720806, version 1

Collections

Citation

Olivier Galy, Alain Boussana, Olivier Hue, Daniel Le Gallais, Christian Prefaut. Is Exercise-Induced Arterial Hypoxemia in Triathletes Dependent on Exercise Modality ?. Internation Journal of Sports Medicine, 2005, 26 (9), pp.719-726. 〈hal-00720806〉

Partager

Métriques

Consultations de la notice

266

Téléchargements de fichiers

330