Pulmonary V(O)(2) kinetics at the onset of exercise is faster when actual changes in alveolar O2 stores are considered.

Détails

ID Serval
serval:BIB_84526DD657A5
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Pulmonary V(O)(2) kinetics at the onset of exercise is faster when actual changes in alveolar O2 stores are considered.
Périodique
Respiratory Physiology and Neurobiology
Auteur(s)
Aliverti A., Kayser B., Cautero M., Dellacà R.L., di Prampero P.E., Capelli C.
ISSN
1878-1519 (Electronic)
ISSN-L
1569-9048
Statut éditorial
Publié
Date de publication
2009
Volume
169
Numéro
1
Pages
78-82
Langue
anglais
Résumé
Breath-by-breath (BbB) oxygen uptake rate (V(O)(2)) was measured at the mouth (MO) and at the alveolar level, at the onset of square wave cycling exercise of moderate intensity in six healthy male subjects. Alveolar BbB V(O)(2) values were calculated correcting MO V(O)(2) values by (i) estimating (GR); and (ii) measuring (opto-electronic plethysmography, OEP) BbB lung O(2) store changes.V(O)(2) kinetics was then described by a bi-exponential model. GR yielded larger values of the time constants (tau2) of the primary phase of V(O)(2) kinetics. The mean response times (MRTs) calculated by analysing GR BbB V(O)(2) values were larger than (i) those obtained by using MO and OEP at 90W; and (ii) that by using MO at 120W. OEP corrected V(O)(2) yielded the highest normalised amplitude of the cardiodynamic phase of the V(O)(2) on-response. Correction of BbB V(O)(2) for actual BbB changes of lung O(2) stores by OEP thus seems more appropriate for the study of the early cardiodynamic phase of V(O)(2) kinetics than GR.
Mots-clé
Adult, Biomechanics, Exercise/physiology, Exercise Test/methods, Forced Expiratory Volume/physiology, Humans, Male, Middle Aged, Mouth, Oxygen Consumption/physiology, Plethysmography/methods, Pulmonary Alveoli/blood supply, Pulmonary Alveoli/physiology, Pulmonary Gas Exchange/physiology, Reaction Time/physiology, Respiration
Pubmed
Web of science
Création de la notice
25/09/2013 13:19
Dernière modification de la notice
03/03/2018 18:54
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