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Titolo:
TESTING MODELS OF RESPIRATORY CONTROL IN SKELETAL-MUSCLE
Autore:
MEYER RA; FOLEY JM;
Indirizzi:
MICHIGAN STATE UNIV,DEPT PHYSIOL E LANSING MI 48824 MICHIGAN STATE UNIV,DEPT RADIOL E LANSING MI 48824
Titolo Testata:
Medicine and science in sports and exercise
fascicolo: 1, volume: 26, anno: 1994,
pagine: 52 - 57
SICI:
0195-9131(1994)26:1<52:TMORCI>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
OXIDATIVE-PHOSPHORYLATION; CREATINE-KINASE; P-31 NMR; METABOLIC CONTROL; FAST-TWITCH; RAT MUSCLE; PHOSPHOCREATINE; ENERGY; CONTRACTION; DEPENDENCE;
Keywords:
P-31 NUCLEAR MAGNETIC RESONANCE; FAST- AND SLOW-TWITCH MAMMALIAN MUSCLE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
R.A. Meyer e J.M. Foley, "TESTING MODELS OF RESPIRATORY CONTROL IN SKELETAL-MUSCLE", Medicine and science in sports and exercise, 26(1), 1994, pp. 52-57

Abstract

We examined the relationships between PCr and Pi vs oxygen consumption or twitch rate during stimulation of rat muscle in situ and of perfused cat biceps and soleus muscles. In fast-twitch muscles such as rat gastrocnemius and cat biceps, we found a linear relationship between PCr and oxygen consumption. This result favors thermodynamic regulationof oxygen consumption by cytoplasmic phosphorylation potential ratherthan kinetic regulation by ADP. PCr changes during stimulation of ratmuscle depleted of total creatine or adenine nucleotide were also notconsistent with simple kinetic regulation by ADP. In cat soleus (slow-twitch) muscle, the observation of nonexponential PCr changes during stimulation suggested more complicated regulation, possibly involving changes in mitochondrial redox potential.

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Documento generato il 03/12/20 alle ore 11:29:56