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  • 2000-2004  (2)
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  • 1
    ISSN: 1440-1681
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 1. Fibre type distributions of the slow soleus and fast plantaris muscles were investigated in 5-, 9- and 20-week-old male Goto-Kakizaki (GK) rats, as an animal model of non-obese diabetes, and were compared with those of age-matched non-diabetic Wistar rats.2. Bodyweight and both soleus and plantaris muscle weights were lower in GK rats than in Wistar rats, regardless of age. In addition, both relative soleus and plantaris muscle weights per bodyweight were lower in GK rats than in Wistar rats, regardless of age.3. In the soleus muscle, a higher percentage of type I fibres and a lower percentage of type IIA fibres were observed in 5- and 9-week-old GK rats. In addition, there were no type IIA fibres in 20-week-old GK rats.4. In the plantaris muscle, there were no differences in fibre type distribution of 5-week-old GK rats. However, a higher percentage of type IIB fibres and a lower percentage of type I and type IIA fibres were observed in 9- and 20-week-old GK rats. In addition, there were no type I fibres in 20-week-old GK rats.5. These results indicate that the decreased percentage of high-oxidative fibres (e.g. type IIA fibres in the soleus muscle and type I and type IIA fibres in the plantaris muscle) of the diabetic animals is concerned with an impairment in insulin sensitivity and glucose metabolism and is not related to bodyweight.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1440-1681
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 1. The fibre type distributions, cross-sectional areas (CSA) and succinate dehydrogenase (SDH) activities in the deep (EDLd) and superficial (EDLs) regions of the extensor digitorum longus (EDL) muscle in normotensive Wistar-Kyoto (WKY) and spontaneously hypertensive rats (SHR) were determined after exposure to cigarette smoke at three different dose levels using a smoking machine.2. Rats were exposed to cigarette smoke at a rate of 15 puffs/min for 20 min/day with 23 cigarettes (low-dose level), 26 cigarettes (medium-dose level) or 30 cigarettes (high-dose level) for 8 weeks.3. No changes in fibre type distribution, CSA or SDH activity were observed after exposure to cigarette smoke at the low- and medium-dose levels, irrespective of the muscle region or strain.4. No change in fibre type distribution was observed after exposure to cigarette smoke at the high-dose level, irrespective of the muscle region or strain. A decreased CSA of type IIA and type IIB fibres in EDLd and increased SDH activity of all types of fibres in EDLd and EDLs were observed in WKY rats after exposure to cigarette smoke at the high-dose level. In addition, a decreased CSA of type IIB fibres in EDLd and type IIA and type IIB fibres in EDLs and increased SDH activity of type IIB fibres in EDLd were observed in SHR after exposure to cigarette smoke at the high-dose level.5. The smaller CSA and higher SDH activity of fibres in EDL observed in WKY rats and SHR after exposure to cigarette smoke at the high-dose level, but not at the low- and medium-dose levels, are adaptive responses, indicating that heavy cigarette smoke affects the morphological and metabolic properties of fibres in skeletal muscle.
    Type of Medium: Electronic Resource
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