Faster pulmonary oxygen uptake kinetics in children vs adults due to enhancements in oxygen delivery and extraction.

E Leclair; S Berthoin; Benoît Borel; D Thevenet; H Carter; G Baquet; P Mucci

Faster pulmonary oxygen uptake kinetics in children vs adults due to enhancements in oxygen delivery and extraction.

E Leclair ¹ S Berthoin Benoît Borel ² D Thevenet ³ H Carter G Baquet P Mucci

1 UDSL, EA 3608, Faculté des Sciences du Sport et de l'Education Physique

2 HAVAE - Handicap, Activité, Vieillissement, Autonomie, Environnement

3 MMA

LBMS - Laboratoire brestois de mécanique et des systèmes

Abstract : This study aimed to examine if the faster pulmonary oxygen uptake (VO2p) phase 2 in children could be explained by increased O2 availability or extraction at the muscle level. For that purpose, O2 availability and extraction were assessed using deoxyhemoglobin (HHb) estimated by near-infrared spectroscopy during moderate-intensity constant load cycling exercise in children and young adults. Eleven prepubertal boys and 12 men volunteered to participate in the study. They performed one maximal graded exercise to determine the power associated with the gas exchange threshold (GET) and four constant load exercises at 90% of GET. VO2p and HHb were continuously monitored. VO2p , HHb, and estimated capillary blood flow (Qcap) kinetics were modelled after a time delay and characterized by the time to achieve 63% of the amplitude (τ) and by mean response time (MRT: time delay + τ), respectively. Mean values of τ for VO2p (P < 0.001), of MRT for HHb (P < 0.01) and of MRT for Qcap (P < 0.001) were significantly shorter in children. Faster VO2p kinetics have been shown in children; these appear due to both faster O2 extraction and delivery kinetics as indicated by faster HHb and Qcap kinetics, respectively.

Type de document :

Article dans une revue

Domaine :

Sciences du Vivant [q-bio] / Médecine humaine et pathologie

Liste complète des métadonnées

https://hal-unilim.archives-ouvertes.fr/hal-01145762
Contributeur : Jean-Christophe Daviet <>
Soumis le : dimanche 26 avril 2015 - 12:05:31
Dernière modification le : jeudi 21 février 2019 - 11:02:54

Faster pulmonary oxygen uptake kinetics in children vs adults due to enhancements in oxygen delivery and extraction.

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Faster pulmonary oxygen uptake kinetics in children vs adults due to enhancements in oxygen delivery and extraction.

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