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Titolo:
CHANGES IN MAGNETIC-RESONANCE IMAGES OF MUSCLE DEPEND ON EXERCISE INTENSITY AND DURATION, NOT WORK
Autore:
JENNER G; FOLEY JM; COOPER TG; POTCHEN EJ; MEYER RA;
Indirizzi:
MICHIGAN STATE UNIV,DEPT PHYSIOL,GILTNER HALL E LANSING MI 48824 MICHIGAN STATE UNIV,DEPT PHYSIOL E LANSING MI 48824 KAROLINSKA HOSP,DEPT DIAGNOST RADIOL S-10401 STOCKHOLM SWEDEN MICHIGAN STATE UNIV,DEPT RADIOL E LANSING MI 48824 MICHIGAN STATE UNIV,DEPT PHYS EDUC & EXERCISE SCI E LANSING MI 48824
Titolo Testata:
Journal of applied physiology
fascicolo: 5, volume: 76, anno: 1994,
pagine: 2119 - 2124
SICI:
8750-7587(1994)76:5<2119:CIMIOM>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
SKELETAL-MUSCLE; RELAXATION-TIMES; TRANSVERSE RELAXATION; PROTON T2; WATER; SPECTROSCOPY; FOREARM; TWITCH;
Keywords:
ECHO-PLANAR MAGNETIC RESONANCE IMAGING; HUMAN SKELETAL MUSCLE; PROTON NUCLEAR MAGNETIC RESONANCE SPIN-SPIN RELAXATION TIME;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
G. Jenner et al., "CHANGES IN MAGNETIC-RESONANCE IMAGES OF MUSCLE DEPEND ON EXERCISE INTENSITY AND DURATION, NOT WORK", Journal of applied physiology, 76(5), 1994, pp. 2119-2124

Abstract

Echo-planar magnetic resonance imaging was used to study the effect of exercise rate and duration on magnetic resonance imaging signal intensity (SI) of anterior tibialis muscle in normal human subjects (mean age 35 yr, n = 6). Axial mid-calf echo-planar images (repetition time/echo time = 6,000/45, acquisition time = 80 ms) were acquired every 6 s for 1 min before and during 15 min of dynamic ankle dorsiflexion exercise (peak force 36% of 1 repetition maximum) at 10, 20, and 30 contractions/min. At each rate, muscle SI rose along an approximately exponential time course (mean time constant 1.8 min) toward a plateau that was linearly dependent on force times contraction rate (r = 0.64, P < 0.01) but varied significantly among subjects. The results confirm previous reports that changes in muscle SI correlate with exercise intensity, but not with total work performed, over a submaximal range of exercise intensities.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 04:58:48