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Titolo:
THE METABOLIC RESPONSES OF HUMAN TYPE-I AND TYPE-II MUSCLE-FIBERS DURING MAXIMAL TREADMILL SPRINTING
Autore:
GREENHAFF PL; NEVILL ME; SODERLUND K; BODIN K; BOOBIS LH; WILLIAMS C; HULTMAN E;
Indirizzi:
UNIV NOTTINGHAM,SCH MED,QUEENS MED CTR,DEPT PHYSIOL & PHARMACOL NOTTINGHAM NG7 2UH ENGLAND LOUGHBOROUGH UNIV TECHNOL,DEPT PHYS EDUC & SPORT SCI LOUGHBOROUGH LE11 3TU LEICS ENGLAND HUDDINGE UNIV HOSP,KAROLINSKA INST,DEPT CLIN CHEM S-14186 HUDDINGE SWEDEN
Titolo Testata:
Journal of physiology
fascicolo: 1, volume: 478, anno: 1994,
pagine: 149 - 155
SICI:
0022-3751(1994)478:1<149:TMROHT>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN SKELETAL-MUSCLE; MUSCULUS QUADRICEPS FEMORIS; ENERGY-METABOLISM; FIBER TYPES; ELECTRICAL-STIMULATION; EXHAUSTIVE EXERCISE; BIOPSY SAMPLES; ATP TURNOVER; SLOW-TWITCH; CONTRACTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
P.L. Greenhaff et al., "THE METABOLIC RESPONSES OF HUMAN TYPE-I AND TYPE-II MUSCLE-FIBERS DURING MAXIMAL TREADMILL SPRINTING", Journal of physiology, 478(1), 1994, pp. 149-155

Abstract

1. Muscle biopsy samples were obtained from the vastus lateralis of six healthy volunteers before and after 30 s of treadmill sprinting. A portion of each biopsy sample was used for mixed-fibre metabolite analysis. Single fibres were dissected from the remaining portion of each biopsy and were used for ATP, phosphocreatine (PCr) and glycogen determination. 2. Before exercise, PCr and glycogen contents were higher intype II fibres (79.3 +/- 2.7 and 472 +/- 35 mmol (kg dry matter (DM))(-1), respectively) compared with type I fibres (71.3 +/- 3.0 mmol (kgDM)(-1), P < 0.01 and 375 +/- 25 mmol (kg DM)(-1), P < 0.001, respectively). 3. Peak power output was 885 +/- 66 W and declined by 65 +/- 3% during exercise. Phosphocreatine and glycogen degradation in type IIfibres during exercise (74.3 +/- 25 and 126.3 +/- 15.8 mmol (kg DM)(-1), respectively) was greater than the corresponding degradation in type I fibres (59.1 +/- 2.9 mmol (kg DM)(-1), P < 0.001, and 77.0 +/- 14.3 mmol (kg DM)(-1), P < 0.01, respectively). The decline in ATP during exercise was similar when comparing fibre types (P > 0.05). 4. Compared with previous studies involving similar durations of maximal cycling exercise, isokinetic knee extension and intermittent isometric contraction, the rates of substrate utilization recorded in type I fibres were extremely high, being close to the rapid rates observed in this fibre type during intense contraction with limb blood flow occluded.

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Documento generato il 27/09/20 alle ore 00:55:48