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Titolo:
EXHAUSTIVE EXERCISE IN THE SEA LAMPREY (PETROMYZON-MARINUS) - RELATIONSHIP BETWEEN ANAEROBIC METABOLISM AND INTRACELLULAR ACID-BASE-BALANCE
Autore:
BOUTILIER RG; FERGUSON RA; HENRY RP; TUFTS BL;
Indirizzi:
UNIV CAMBRIDGE,DEPT ZOOL,DOWNING ST CAMBRIDGE CB2 3EJ ENGLAND QUEENS UNIV,DEPT BIOL KINGSTON K7L 3N6 ONTARIO CANADA
Titolo Testata:
Journal of Experimental Biology
, volume: 178, anno: 1993,
pagine: 71 - 88
SICI:
0022-0949(1993)178:<71:EEITSL>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
PURINE NUCLEOTIDE CYCLE; RAINBOW-TROUT; WHITE MUSCLE; LAMPETRA-FLUVIATILIS; SKELETAL-MUSCLE; RED MUSCLE; TRANSPORT; LACTATE; BLOOD; ATP;
Keywords:
ACID BASE BALANCE; EXERCISE; LAMPREY; PETROMYZON-MARINUS; ANAEROBIC METABOLISM; INTRACELLULAR PH; MUSCLE LACTATE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
48
Recensione:
Indirizzi per estratti:
Citazione:
R.G. Boutilier et al., "EXHAUSTIVE EXERCISE IN THE SEA LAMPREY (PETROMYZON-MARINUS) - RELATIONSHIP BETWEEN ANAEROBIC METABOLISM AND INTRACELLULAR ACID-BASE-BALANCE", Journal of Experimental Biology, 178, 1993, pp. 71-88

Abstract

We measured intracellular acid-base balance and indicators of carbohydrate and high-energy phosphate metabolism as lampreys recovered from exhaustive exercise. A combined respiratory and metabolic acidosis wasobserved in the locomotory muscle following 'burst' exercise. Muscle pH decreased from approximately 7.2 to 6.7, whereas intracellular P(CO2) rose from approximately 0.6 to 1.6 kPa. Unlike the situation in similarly stressed teleost fish such as rainbow trout, the respiratory acidosis in muscle persisted for several hours. This apparent CO2 retention in lamprey muscle may be the result of a restricted ability of thecirculatory system to transport CO2 due to reduced erythrocyte anion exchange, or it could represent a restricted ability of the muscle itself to clear the intracellular pool Of CO2 due to reduced carbonic anhydrase activity. Maximal lactate dehydrogenase activity of lamprey muscle exhibited a marked dependence on pH, increasing in activity by 30 % as pH decreased from 7.2 to 6.7 (reflecting the 'resting' to 'post-exercise' pH change observed in vivo). Following exhaustive exercise, the acid-base balance of the muscle is influenced by both proton-consuming (e.g. AMP deamination, glycogen replenishment) and proton-producing (e.g. rephosphorylation of creatine) metabolic processes. The net effect is that, although intracellular pH is maximally depressed, energystores such as phosphocreatine and glycogen are partially restored within 1 h of exhaustive exercise, placing the animal in good stead for further locomotory work.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 08/07/20 alle ore 06:43:52