ISSN:
1439-6327
Keywords:
Acclimation
;
Energy intake
;
Skeletal muscle
;
Mitochondria
;
Respiratory enzymes
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary Influence of a cold (10° C) or warm (35° C) environment and a high or low level of energy intake on respiratory enzyme activities has been investigated in porcine skeletal muscle. Scanning microdensitometry was used to measure the reaction products from mitochondrial enzymes in individual slowand fast-twitch muscle fibres. A cold environment was found to increase the activity of succinate dehydrogenase in both types of muscle fibre (P〈0.001 for dark fibres, P〈0.01 for light fibres) from young growing animals. Enzyme activity was also increased in animals on a low compared with a high energy intake (P〈0.01) when living at 10° C but not at 35° C. Similar findings were obtained for NADH diaphorase and cytochrome oxidase aa 3. The numbers of slow-twitch muscle fibres also increased after exposure to cold (P〈0.01) and as a result of a low energy intake (P〈0.01). These results are similar to those obtained in other species after exercise or as a result of peripheral arterial insufficiency. The extent to which they could be related to local tissue hypoxia or to changes in metabolic hormones is discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00417256
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