Metabolic and cardioventilatory responses during a graded exercise test before and 24 h after a triathlon

  • Daniel Le Gallais
  • Maurice Hayot
  • Olivier Hue
  • Dieudonné Wouassi
  • Alain Boussana
  • Michèle Ramonatxo
  • Christian Préfaut
ORIGINAL ARTICLE

DOI: 10.1007/s004210050492

Cite this article as:
Le Gallais, D., Hayot, M., Hue, O. et al. Eur J Appl Physiol (1999) 79: 176. doi:10.1007/s004210050492

Abstract

Previous studies have reported respiratory, cardiac and muscle changes at rest in triathletes 24 h after completion of the event. To examine the effects of these changes on metabolic and cardioventilatory variables during exercise, eight male triathletes of mean age 21.1 (SD 2.5) years (range 17–26 years) performed an incremental cycle exercise test (IET) before (pre) and the day after (post) an official classic triathlon (1.5-km swimming, 40-km cycling and 10-km running). The IET was performed using an electromagnetic cycle ergometer. Ventilatory data were collected every minute using a breath-by-breath automated system and included minute ventilation (E), oxygen uptake (O2), carbon dioxide production (CO2), respiratory exchange ratio, ventilatory equivalent for oxygen (E/O2) and for carbon dioxide (E/CO2), breathing frequency and tidal volume. Heart rate (HR) was monitored using an electrocardiogram. The oxygen pulse was calculated as O2/HR. Arterialized blood was collected every 2 min throughout IET and the recovery period, and lactate concentration was measured using an enzymatic method. Maximal oxygen uptake (O2max) was determined using conventional criteria. Ventilatory threshold (VT) was determined using the V-slope method formulated earlier. Cardioventilatory variables were studied during the test, at the point when the subject felt exhausted and during recovery. Results indicated no significant differences (P>0.05) in O2max [62.6 (SD 5.9) vs 64.6 (SD 4.8) ml · kg−1 · min−1], VT [2368 (SD 258) vs 2477 (SD 352) ml · min−1] and time courses of O2 between the pre- versus post-triathlon sessions. In contrast, the time courses of HR and blood lactate concentration reached significantly higher values (P<0.05) in the pre-triathlon session. We concluded that these triathletes when tested 24 h after a classic triathlon displayed their pre-event aerobic exercise capacity, bud did not recover pre-triathlon time courses in HR or blood lactate concentration.

Key words Maximal oxygen uptake Ventilatory threshold Blood lactate Incremental exercise Triathlon 

Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • Daniel Le Gallais
    • 1
  • Maurice Hayot
    • 2
  • Olivier Hue
    • 3
  • Dieudonné Wouassi
  • Alain Boussana
    • 3
  • Michèle Ramonatxo
    • 2
  • Christian Préfaut
    • 2
  1. 1.Interface Biopsychosociale des A.P.A., Unité de Formation et de Recherche en Sciences et Techniques des Activités Physiques et Sportives (UFR STAPS), 700 Avenue du Pic Saint Loup, F-34100 Montpellier, FranceFR
  2. 2.Laboratoire de Physiologie des Interactions, Service d'Exploration de la Fonction Respiratoire, Centre Hospitalier Universitaire Arnaud de Villeneuve, 371 Avenue Doyen Gaston Giraud, F-34295 Montpellier, FranceFR
  3. 3.Laboratoire d'Optimisation de la Performance Motrice, UFR STAPS, 700 Avenue du Pic Saint Loup, F-34100 Montpellier, FranceFR

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