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Titolo:
MUSCLE-FIBER TYPES AND ENZYME-ACTIVITIES AFTER TRAINING WITH LOCAL LEG ISCHEMIA IN MAN
Autore:
ESBJORNSSON M; JANSSON E; SUNDBERG CJ; SYLVEN C; EIKEN O; NYGREN A; KAIJSER L;
Indirizzi:
KAROLINSKA INST,HUDDINGE HOSP,DEPT CLIN PHYSIOL S-14186 HUDDINGE SWEDEN KAROLINSKA INST,HUDDINGE HOSP,DEPT CLIN PHYSIOL S-14186 HUDDINGE SWEDEN KAROLINSKA HOSP,DEPT CLIN PHYSIOL S-10401 STOCKHOLM 60 SWEDEN DEPT PHYSIOL,ENVIRONM PHYSIOL LAB STOCKHOLM SWEDEN
Titolo Testata:
Acta Physiologica Scandinavica
fascicolo: 3, volume: 148, anno: 1993,
pagine: 233 - 241
SICI:
0001-6772(1993)148:3<233:MTAEAT>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN SKELETAL-MUSCLE; PERIPHERAL ARTERIAL INSUFFICIENCY; FIBER TYPES; INTERMITTENT CLAUDICATION; METABOLIC CHARACTERISTICS; CAPILLARY GROWTH; BLOOD-FLOW; ADAPTATION; EXERCISE; PERFORMANCE;
Keywords:
CAPILLARIES; FAST-TWITCH FIBERS; FIBER CROSS-SECTIONAL AREAS; SKELETAL MUSCLE; SLOW-TWITCH FIBERS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
44
Recensione:
Indirizzi per estratti:
Citazione:
M. Esbjornsson et al., "MUSCLE-FIBER TYPES AND ENZYME-ACTIVITIES AFTER TRAINING WITH LOCAL LEG ISCHEMIA IN MAN", Acta Physiologica Scandinavica, 148(3), 1993, pp. 233-241

Abstract

Eight healthy men performed supine one-legged training on a bicycle ergometer 45 min per leg four times per week for 4 week. The ergometer and lower body were inside a pressure chamber, the opening of which was sealed at the level of the crotch. One leg trained with impeded leg blood flow (I-leg), induced by an increased (50 mmHg) chamber pressure, at the highest tolerable intensity. The contralateral leg trained atthe same power under normal pressure (N-leg). Before and after training biopsies were taken from the vastus lateralis of both legs and maximal one-legged exercise tests were executed with both legs. Biopsies were repeated when the subjects had been back to their habitual physical activity for 3 months. Training increased exercise time to exhaustion, but more in the I-leg than in the N-leg. After training, the I-leg had higher activity of citrate synthase (CS), a marker of oxidative capacity, and lower activity of the M-subunit of lactate dehydrogenase isoenzymes. It also had a higher percentage of type-I fibres and a lower percentage of IIB fibres, larger areas of all fibre types and a greater number of capillaries per fibre. It is concluded that ischaemic training changes the muscle metabolic profile in a direction facilitating aerobic metabolism. An altered fibre-type composition may contribute, but is not enough prerequisite for the change.

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Documento generato il 25/09/20 alle ore 14:19:33