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Nonshivering thermogenesis in king penguin chicks. I. Role of skeletal muscle

Nonshivering thermogenesis in king penguin chicks. I. Role of skeletal muscle nonshiverg cytochrome thermogenesis; oxidase activity; YOUNG DUCKLGS, cold-acclimation results, an itial stage, the development of a potentiated shiverg thermogenesis (PST) (7) and, later, the development of a true nonshiverg thermogenesis () (4). the pengu chick, a wild bird adapted to the harsh subantarctic climate durg its growth, has also been demorated (14, 15). Thus this heat production mechanism can be as well developed some species of birds as it is mammals. Because brown adipose tiue (BAT), the ma site of small cold-acclimated mammals, is lac R1438 0363-6119/91 $1.50 Copyright birds (4, ‘22, 27), mechanisms are aumed to be quite different birds compared with mammals. Norepephre, the major mediator for mammals, has no calorigenic effect pengus contrast to the powerful calorigenic action of glucagon (8). young ducklgs, attention has focused on skeletal as the major site of . The fdgs showed a higher mitochondria sensitivity to the uncouplg effect of free fatty acid and a higher oxidative capacity of pectoral and gastrocnemius s after cold acclimation (2, 10). These changes skeletal mitochondria were also observed chronic glucagon-treated ducklgs (3) and could expla the thermogenic and hyperthermic responses without shiverg observed response to a glucagon-test jection (6). However, the liver http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png AJP - Regulatory, Integrative and Comparative Physiology The American Physiological Society

Nonshivering thermogenesis in king penguin chicks. I. Role of skeletal muscle

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Publisher
The American Physiological Society
Copyright
Copyright © 1991 the American Physiological Society
ISSN
0363-6119
eISSN
1522-1490
Publisher site
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Abstract

nonshiverg cytochrome thermogenesis; oxidase activity; YOUNG DUCKLGS, cold-acclimation results, an itial stage, the development of a potentiated shiverg thermogenesis (PST) (7) and, later, the development of a true nonshiverg thermogenesis () (4). the pengu chick, a wild bird adapted to the harsh subantarctic climate durg its growth, has also been demorated (14, 15). Thus this heat production mechanism can be as well developed some species of birds as it is mammals. Because brown adipose tiue (BAT), the ma site of small cold-acclimated mammals, is lac R1438 0363-6119/91 $1.50 Copyright birds (4, ‘22, 27), mechanisms are aumed to be quite different birds compared with mammals. Norepephre, the major mediator for mammals, has no calorigenic effect pengus contrast to the powerful calorigenic action of glucagon (8). young ducklgs, attention has focused on skeletal as the major site of . The fdgs showed a higher mitochondria sensitivity to the uncouplg effect of free fatty acid and a higher oxidative capacity of pectoral and gastrocnemius s after cold acclimation (2, 10). These changes skeletal mitochondria were also observed chronic glucagon-treated ducklgs (3) and could expla the thermogenic and hyperthermic responses without shiverg observed response to a glucagon-test jection (6). However, the liver

Journal

AJP - Regulatory, Integrative and Comparative Physiology – The American Physiological Society

Published: Dec 1, 1991

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