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Titolo:
EFFECTS OF TRAINING IN NORMOXIA AND NORMOBARIC HYPOXIA ON HUMAN MUSCLE ULTRASTRUCTURE
Autore:
DESPLANCHES D; HOPPELER H; LINOSSIER MT; DENIS C; CLAASSEN H; DORMOIS D; LACOUR JR; GEYSSANT A;
Indirizzi:
FAC MED LYON GRANGE BLANCHE,PHYSIOL LAB,CNRS,URA 1341 F-69373 LYON 08FRANCE UNIV BERN,INST ANAT CH-3000 BERN SWITZERLAND FAC MED ST ETIENNE,LAB PHYSIOL GIP EXERCISE F-42023 ST ETIENNE FRANCE FAC MED LYON SUD,CTR RECH BIOMECAN ARTICULAIRE F-69921 OULLINS FRANCE
Titolo Testata:
Pflugers Archiv
fascicolo: 3-4, volume: 425, anno: 1993,
pagine: 263 - 267
SICI:
0031-6768(1993)425:3-4<263:EOTINA>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN SKELETAL-MUSCLE; OPERATION EVEREST-II; ENDURANCE EXERCISE; OXYGEN-TRANSPORT; ADAPTATIONS;
Keywords:
TRAINING; NORMOXIA; NORMOBARIC HYPOXIA; MUSCLE; MORPHOMETRY; MITOCHONDRIA; CAPILLARIES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
20
Recensione:
Indirizzi per estratti:
Citazione:
D. Desplanches et al., "EFFECTS OF TRAINING IN NORMOXIA AND NORMOBARIC HYPOXIA ON HUMAN MUSCLE ULTRASTRUCTURE", Pflugers Archiv, 425(3-4), 1993, pp. 263-267

Abstract

The adaptive response of skeletal muscle to training in normoxia and in severe normobaric hypoxia was studied. The first group of five malesubjects trained for 3 weeks on a bicycle (2 h/day, 6 days/week) in normoxia (Control training, Con T). A second group of five subjects trained in an ambient FIO2 decreasing progressively from 12.7% to a finallevel of 10.0% (hypoxic training, Hyp T). Fourteen months later, these subjects trained in normoxia at the same absolute power (normoxic training, Nor T). Peak oxygen consumption (VO2 max) was measured in normoxic and hypoxic conditions. Biopsies from the vastus lateralis musclewere analysed for fibre size, capillary and ultrastructural composition. Nor T had no effect on muscle tissue or VO2 max. Con T increased volume density of total mitochondria and lipids by 36 and 135% respectively (P < 0.05). Hyp T induced a 10% increase (P < 0.05) in peak VO2 max measured in hypoxia. Mean fibre cross-sectional area, interfibrillar mitochondrial volume density and capillary-to-fibre ratio were increased (P < 0.05) by 10, 42 and 13% respectively in the Hyp T group. These results suggest that training at the same relative workload in normoxia and hypoxia have similar, but not identical, effects on muscle tissue. If training in normoxia is carried out at the same absolute workload as in severe hypoxia, no significant effects are observed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/03/20 alle ore 00:34:25