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2002•DergiPark (Istanbul University)Requires access

Morphological Adaptation of Rat Skeletal Muscle to A Cold Environment

Fatime Geyikoğlu

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Abstract

Male Sprague-Dawley rats (SD) were kept in medium between the postnatal 80th and 130th day while environmental temperature (from 20 to 5 ºC) and photoperiod were decreased gradually. The weight of the animals adapted to the cold and the weight and length of the external digitorum longus (EDL) muscle were measured. When compared with controls, in a cold environment the weight and fiber length of the muscle was reduced significantly. In addition, EDL muscle was separated into two (red and white) by using the succinic dehydrogenase (SDH) method and the percentage of fiber types and fiber diameters according to mitochondria contents were measured. Transformations in muscle fibers (from Type IIb to Type IIa), decreases in fiber diameters (particularly Type IIb) and atrophic fibers (in Type IIa and Type IIb) were observed. However, normal values were obtained when the temperature returned to normal.

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What this paper is about

Male Sprague-Dawley rats (SD) were kept in medium between the postnatal 80th and 130th day while environmental temperature (from 20 to 5 ºC) and photoperiod were decreased gradually. The weight of the animals adapted to the cold and the weight and length of the external digitorum longus (EDL) muscle were measured. When compared with controls, in a cold environment the weight and fiber length of the muscle was reduced significantly. In addition, EDL muscle was separated into two (red and white) by using the succinic dehydrogenase (SDH) method and the percentage of fiber types and fiber diameters according to mitochondria contents were measured. Transformations in muscle fibers (from Type IIb to Type IIa), decreases in fiber diameters (particularly Type IIb) and atrophic fibers (in Type IIa and Type IIb) were observed. However, normal values were obtained when the temperature returned to normal.

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Available abstract

Male Sprague-Dawley rats (SD) were kept in medium between the postnatal 80th and 130th day while environmental temperature (from 20 to 5 ºC) and photoperiod were decreased gradually. The weight of the animals adapted to the cold and the weight and length of the external digitorum longus (EDL) muscle were measured. When compared with controls, in a cold environment the weight and fiber length of the muscle was reduced significantly. In addition, EDL muscle was separated into two (red and white) by using the succinic dehydrogenase (SDH) method and the percentage of fiber types and fiber diameters according to mitochondria contents were measured. Transformations in muscle fibers (from Type IIb to Type IIa), decreases in fiber diameters (particularly Type IIb) and atrophic fibers (in Type IIa and Type IIb) were observed. However, normal values were obtained when the temperature returned to normal.

Key concepts: Succinic dehydrogenase, Muscle fibre, Fiber type, Endocrinology, Animal science, Chemistry, Fiber, Dehydrogenase

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