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Titolo:
Enhanced oxygen extraction and reduced flow heterogeneity in exercising muscle in endurance-trained men
Autore:
Kalliokoski, KK; Oikonen, V; Takala, TO; Sipila, H; Knuuti, J; Nuutila, P;
Indirizzi:
Univ Turku, Turku PET Ctr, FIN-20521 Turku, Finland Univ Turku Turku Finland FIN-20521 rku PET Ctr, FIN-20521 Turku, Finland Univ Turku, Dept Med, FIN-20521 Turku, Finland Univ Turku Turku Finland FIN-20521 u, Dept Med, FIN-20521 Turku, Finland
Titolo Testata:
AMERICAN JOURNAL OF PHYSIOLOGY-ENDOCRINOLOGY AND METABOLISM
fascicolo: 6, volume: 280, anno: 2001,
pagine: E1015 - E1021
SICI:
0193-1849(200106)280:6<E1015:EOEARF>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSITRON-EMISSION-TOMOGRAPHY; HUMAN SKELETAL-MUSCLE; BLOOD-FLOW; SUBMAXIMAL EXERCISE; INSULIN; ADAPTATION; PERFUSION; VOLUME;
Keywords:
oxygen consumption; perfusion; athletes;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Kalliokoski, KK Univ Turku, Turku PET Ctr, POB 52, FIN-20521 Turku, Finland Univ Turku POB 52 Turku Finland FIN-20521 Turku, Finland
Citazione:
K.K. Kalliokoski et al., "Enhanced oxygen extraction and reduced flow heterogeneity in exercising muscle in endurance-trained men", AM J P-ENDO, 280(6), 2001, pp. E1015-E1021

Abstract

The aim of this study was to investigate the effects of endurance trainingon skeletal muscle hemodynamics and oxygen consumption. Seven healthy endurance-trained and seven untrained subjects were studied. Oxygen uptake, blood flow, and blood volume were measured in the quadriceps femoris muscle group by use of positron emission tomography and [O-15]O-2, [O-15]H2O, and [O-15]CO during rest and one-legged submaximal intermittent isometric exercise. The oxygen extraction fraction was higher (0.49 +/- 0.14 vs. 0.29 +/- 0.12; P = 0.017) and blood transit time longer (0.6 +/- 0.1 vs. 0.4 +/- 0.1 min; P = 0.04) in the exercising muscle of the trained compared with the untrained subjects. The flow heterogeneity by means of relative dispersion waslower for the exercising muscle in the trained (50 +/- 9%) compared with the untrained subjects (65 +/- 13%, P = 0.025). In conclusion, oxygen extraction is higher, blood transit time longer, and perfusion more homogeneous in endurance-trained subjects compared with untrained subjects at the same workload. These changes may be associated with improved exercise efficiency in the endurance-trained subjects.

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Documento generato il 21/01/20 alle ore 00:56:53