The Effects of Exercise and Training on the Activities of Human Skeletal Muscle Glycogen Cycle Enzymes

Taylor, Albert W.

doi:10.1007/978-3-0348-5523-5_54

Cited by 6 publications

(3 citation statements)

References 31 publications

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“…Although the mechanism was not completely characterized, it appeared to involve changes in the intracellular system of protein kinases-lipases rather than changes in the number or the affinity of cell surface adrenoreceptors. Similarly, Taylor (1973) reported that, in man, training increased the activity of phosphorylase a. This enzyme, upon stimulation by epinephrine, catalyzes the conversion of glycogen into glucose 1-phosphate, from which glucose 6phosphate and free glucose are made (Lehninger, 1975).…”

Section: Plasma Glucosementioning

confidence: 98%

“…Because training increases an animal's sensitivity to the catecholamines, even a small increase in plasma epinephrine levels should still cause a noticeable hyperglycemia. In man, training increases phosphorylase a activity (this enzyme catalyzes the conversion of glycogen into glucose) so that glucose production is further enhanced during exercise or stress (Taylor, 1973). The effect of training on the activity of phosphorylase a in fish has not been investigated.…”

Section: Catecholamines and Glucosementioning

confidence: 99%

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Exercise training and the stress response in rainbow trout, Salmo gairdneri Richardson

Woodward

Smith

1985

Journal of Fish Biology

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Plasma levels of catecholamines, cortisol, and glucose were monitored in rainbow trout during a 6-week forced swimming exercise programme. Compared to resting non-exercised controls, resting trained fish had lower levels of epinephrine, norephinephrine, cortisol, and glucose during the last 3 weeks of training. Initially, trained fish that were swimming had higher levels of epinephrine than resting trained fish. After 2 weeks of exercise, swimming did not significantly elevate epinephrine levels in trained fish. Glucose levels were consistently greater in swimming fish than in resting fish. At the end of the training period, exercised trout had lower (1 5-20%) oxygen consumption rates while resting or swimming than unexercised fish.After a 5-month forced swimming exercise programme plasma levels of catecholamines and glucose were monitored in trained and untrained cannulated rainbow trout after 2 min of mild agitation. Trained fish showed an immediate (within 1 min) increase in the levels of epinephrine, but not norepinephrine and a delayed (within 15 min) increase in the levels of plasma glucose.Epinephrine levels returned to pre-stress levels within 15 min. Untrained fish had no significant increase in the plasma levels of norepinephrine, epinephrine, or glucose.

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Section: Plasma Glucosementioning

confidence: 98%

Section: Catecholamines and Glucosementioning

confidence: 99%

Exercise training and the stress response in rainbow trout, Salmo gairdneri Richardson

Woodward

Smith

1985

Journal of Fish Biology

View full text Add to dashboard Cite

show abstract

“…Sport scientists assess the energy subtrate concentrations Taylor et at., 1971;Bergstrom, 1976) and the activity levels of numerous metabolic marker enzymes (Gollnick et at., 1972;Gollnick et al, 1973;Saltin, 1973, andTaylor, 1975). The resultant data has been used to improve training programmes, dietary regimens and ultimately the productivity of the athletes Hultman, 1967;Hultman, 1978;Taylor et al, 1978).…”

Section: Introductionmentioning

confidence: 99%