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Titolo:
OXYGEN-UPTAKE DURING SUBMAXIMAL INCREMENTAL AND CONSTANT WORK LOAD EXERCISES IN HYPOXIA
Autore:
BENOIT H; BUSSO T; PRIEUR F; CASTELLS J; FREYSSENET D; LACOUR JR; DENIS C; GEYSSANT A;
Indirizzi:
CHU ST ETIENNE,HOP ST JEAN BONNEFONDS,PAVILLON 12 F-42055 ST ETIENNE 2 FRANCE UNIV ST ETIENNE,FAC MED ST ETIENNE,LAB PHYSIOL GIP EXERCISE F-42100 ST ETIENNE FRANCE UNIV LYON 1,LAB PHYSIOL GIP EXERCISE,FAC MED LYON SUD OULLINS FRANCE
Titolo Testata:
International journal of sports medicine
fascicolo: 2, volume: 18, anno: 1997,
pagine: 101 - 105
SICI:
0172-4622(1997)18:2<101:ODSIAC>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
OPERATION EVEREST-II; GAS-EXCHANGE; MUSCLE; KINETICS; LACTATE;
Keywords:
METABOLIC EFFICIENCY; NORMOBARIC ACUTE HYPOXIA; VENTILATION; WORK OF BREATHING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
21
Recensione:
Indirizzi per estratti:
Citazione:
H. Benoit et al., "OXYGEN-UPTAKE DURING SUBMAXIMAL INCREMENTAL AND CONSTANT WORK LOAD EXERCISES IN HYPOXIA", International journal of sports medicine, 18(2), 1997, pp. 101-105

Abstract

The effect of acute hypoxia on oxygen uptake (VO2) was studied duringincremental (IE) and constant work load exercises. Twenty-two healthysubjects performed two incremental exercises on a bicycle ergometer under normoxic (21% O-2) and hypoxic (10.4% O-2) conditions. Fifteen subjects performed a constant work load exercise at the same absolute power (CAP) (116 +/- 33 W), while seven other subjects performed three constant work load exercises at the same relative power (CRP) (50, 60 and 70% of VO(2)max) in both conditions. VO2 was defined as extraventilatory when the estimation of respiratory muscles O-2 consumption was subtracted from the total VO2. During IE, the slope of the linear regression relating VO2 to work rate was higher in normoxia than in hypoxia(11.6 +/- 1.2 ml . l(-1) W-1 vs 10.1 +/- 1.1 ml l(-1) . W-1, p < 0.01). During CAP, VO2 was lower in normoxia than in hypoxia (1.88 +/- 0.45 l . min(-1) vs 1.96 +/- 0.42 l . min(-1), p < 0.01) whereas extraventilatory VO2 was not significantly different (1.80 +/- 0.44 l . min(-1) vs 1.77 +/- 0.36 l . min(-1)). During CRP, the slope relating VO2 topower output computed from the three work lods was not statistically different between normoxia and hypoxia (Delta VO2/Delta w = 11.9 +/- 3.1 ml . min(-1) . W-1 vs 12.3 +/- 1.2 ml . min(-1) . W-1). These findings showed that during CRP, the metabolic efficiency (Delta VO2/Delta w) was the same in normoxia and in hypoxia. During CAP, the respiratory muscles O-2 consumption might have accounted for the difference in VO2 consumption between hypoxia and normoxia.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 22:58:19