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Titolo:
P-31-NMR SPECTROSCOPY, RSEMG, AND HISTOCHEMICAL FIBER TYPES OF HUMAN WRIST FLEXOR MUSCLES
Autore:
MIZUNO M; SECHER NH; QUISTORFF B;
Indirizzi:
UNIV COPENHAGEN,PANUM INST,DEPT MED BIOCHEM & GENET,CTR NUCL MAGNET RESONANCE,BELGDAMSVEJ 3 DK-2200 COPENHAGEN N DENMARK UNIV COPENHAGEN,RIGSHOSP,DEPT ANAESTHESIA DK-2100 COPENHAGEN O DENMARK
Titolo Testata:
Journal of applied physiology
fascicolo: 2, volume: 76, anno: 1994,
pagine: 531 - 538
SICI:
8750-7587(1994)76:2<531:PSRAHF>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGNETIC-RESONANCE SPECTROSCOPY; HUMAN CALF MUSCLE; SKELETAL-MUSCLE; EXERCISE; PHOSPHATE; HETEROGENEITY; FOREARM; NMR; MRI;
Keywords:
FAST-TWITCH FIBERS; FOREARM EXERCISE; INORGANIC PHOSPHATE; MUSCLE PH; PHOSPHOCREATINE; SLOW-TWITCH FIBERS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
40
Recensione:
Indirizzi per estratti:
Citazione:
M. Mizuno et al., "P-31-NMR SPECTROSCOPY, RSEMG, AND HISTOCHEMICAL FIBER TYPES OF HUMAN WRIST FLEXOR MUSCLES", Journal of applied physiology, 76(2), 1994, pp. 531-538

Abstract

The metabolic response to graded rhythmic forearm exercise determinedby phosphorus-31 nuclear magnetic resonance (P-31-NMR) spectroscopy was evaluated with respect to recruitment pattern of muscles and to fiber type composition of the nondominant arm in 14 untrained subjects. Rectified smoothed surface electromyography (rsEMG) over finger and wrist flexor muscles increased similarly and progressively at 30, 45, and60% of maximal exercise intensity. On the basis of the P-31-NMR response pattern during exercise, subjects were separated into three groups: H group (n = 4), with a single high-pH P-i peak; M group (n = 7), with two P-i peaks reflecting two pH components; and L group (n = 3), with a single low-pH P-i peak. The H group demonstrated a faster recovery of P-i and phosphocreatine than the L group (P < 0.05). The M group displayed both types of P-i recovery and an intermediate resynthesis rate of phosphocreatine. The M group had an even distribution of slow- and fast-twitch fibers in the flexor carpi radialis muscle, whereas subjects in the H and L groups possessed a predominance of slow- and fast-twitch fibers, respectively. The results suggest that during rhythmic forearm exercise the interindividual NMR variation in energy metabolism is related closely to fiber type composition of the muscle.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/07/20 alle ore 20:33:19