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Titolo:
Effect of exercise intensity on the changes in alveolar slopes of carbon dioxide and oxygen expiratory profiles in humans
Autore:
Steinacker, JM; Dehnert, C; Whipp, BJ;
Indirizzi:
Univ Ulm Klinikum, Med Klin & Poliklin, Abt Sport & Rehabil Med, D-89070 Ulm, Germany Univ Ulm Klinikum Ulm Germany D-89070 Rehabil Med, D-89070 Ulm, Germany Univ London St Georges Hosp, Sch Med, Dept Physiol, London SW17 ORE, England Univ London St Georges Hosp London England SW17 ORE on SW17 ORE, England
Titolo Testata:
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 1-2, volume: 85, anno: 2001,
pagine: 56 - 61
SICI:
1439-6319(200107)85:1-2<56:EOEIOT>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
PULMONARY GAS-EXCHANGE; ARTERIAL PCO2; DIFFUSION LIMITATION; SEA-LEVEL; VENTILATION; LUNG; CO2; O2;
Keywords:
expiratory gas profile; exercise; metabolism;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Steinacker, JM Univ Ulm Klinikum, Med Klin & Poliklin, Abt Sport & RehabilMed, D-89070 Ulm, Germany Univ Ulm Klinikum Ulm Germany D-89070 -89070 Ulm, Germany
Citazione:
J.M. Steinacker et al., "Effect of exercise intensity on the changes in alveolar slopes of carbon dioxide and oxygen expiratory profiles in humans", EUR J A PHY, 85(1-2), 2001, pp. 56-61

Abstract

The slope of the expired alveolar partial pressure of carbon dioxide profile increases during exercise. Its relationship to metabolic rate, however, remains to be determined at high exercise intensities. We therefore determined the slope of alveolar partial pressures of carbon dioxide and oxygen ((P)over dot(A)CO(2), (P)over dot(A)O(2), respectively) during incremental cycle ergometer exercise (an increment of 40 W each minute) to exhaustion in 11 normal subjects. The (P)over dot(A)CO(2) and (P)over dot(A)O(2) increased as linear functions of carbon dioxide production and oxygen uptake ((V)over dotO(2)), respectively, up to the estimated lactate threshold (theta (-)(La)). At Higher intensities (P)over dot(A)CO(2), increased disproportionately but (P)over dot(A)O(2) continued to increase at the same rate in 7 subjects but increased more rapidly in the remainder. The rate of change in (P)over dot(A)CO(2) per unit rate of change in PO, averaged 3.15 (SD 1.05) (mmHg.s(-1)). (l.min(-1))(-1) while the rate of change in (P)over dot(A)O(2) per unit rate of change in (V)over dotO(2) averaged -3.53 (SD 0.79) (mmHg.s(-1)).(l-min(-1))(-1) over this range. The more rapid increase in (P)over dotCO(2) above theta (-)(La) was consistent with an accelerated CO, exchange,whereas the more rapid rate of change in (P)over dot(A)O(2) in 3 of the subjects may have reflected the development of an increased distribution of the ventilation perfusion ratio in addition to the effects of hyperventilation.

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Documento generato il 26/09/20 alle ore 05:21:42