Occurrence of hibernation in the golden hamster,Mesocricetus auratus waterhouse

Smit-Vis, J.H.; Smit, G.J.

doi:10.1007/bf02152320

Cited by 4 publications

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“…other environmental stimuli including scarcity of food, reduced photoperiod and isolation (Smit-Vis & Smit, 1963;Hoffman, 1964;Jansky et al 1981). Even under optimum hibernatory conditions, not all hamsters will enter hibernation (Lyman & O'Brien, 1977).…”

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“…Actual entry into hibernation must be preceded by a series of permissive physiological and biochemical adaptations. Low ambient temperature is not the sole cause of hibernation, as hibernating hamsters have been observed at temperatures of 14-20°C (Mogler, 1958), but acts in concert with a variety of other environmental stimuli including scarcity of food, reduced photoperiod and isolation (Smit-Vis & Smit, 1963;Hoffman, 1964;Jansky et al 1981). Even under optimum hibernatory conditions, not all hamsters will enter hibernation (Lyman & O'Brien, 1977).…”

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Differential Effects of Cold Exposure on Muscle Fibre Composition and Capillary Supply in Hibernator and Non‐Hibernator Rodents

Egginton

Fairney

Bratcher

2001

Experimental Physiology

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Changes in the composition of fibre types and the capillary supply of skeletal muscle (tibialis anterior) were quantified in rats and hamsters subjected to 8‐10 weeks of cold exposure and reduced photoperiod (10 °C, 1 h light‐23 h dark). Muscle mass decreased in both species (by 12% and 17%, respectively). Following acclimation to cold there were no specific changes in fibre cross‐sectional area (FCSA) in rats, whereas in hamsters there was a substantial atrophy of Type II, but not Type I fibres. In rat muscle there was little difference between the two groups in average capillary to fibre ratio (C:F) (1.76 ± 0.15, normothermia, N; 1.69 ± 0.05, hypothermia, H) and average capillary density (CD) (188 ± 14 mm−2, N; 201 ± 12 mm‐2, H). Similarly, the average C:F was unaltered in hamsters (2.75 ± 0.11, N; 2.72 ± 0.15, H), although the 30% smaller fibre size observed with hypothermia resulted in a corresponding increase in average CD, to 1539 ± 80 mm−2 (P < 0.01). However, there was a coordinated regional adaptation to cold exposure in hamsters resulting in capillary rarefaction in the glycolytic cortex and angiogenesis in the oxidative core. Following acclimation of rats to cold there was a reduction in the supply area of individual vessels (capillary domain), particularly in the cortex (9310, N; 8938 μm2, H; P < 0.05). In contrast, hypothermic hamsters showed only a small decrease in mean domain area in the cortex (948 μm2, N; 846 μm2, H; n.s.) but a marked reduction in the core (871 μm2, N; 604 μm2, H; P < 0.01). Rats showed little or no change in local capillary supply (LCFR) to fast fibres on acclimation to cold, while in hamsters the LCFR of Type IIb fibres showed a decrease in the cortex (2.7, N; 2.3, H) and an increase in the core (3.0, N; 3.3, H) during acclimation to cold. These data suggest that during a simulated onset of winter rats maintain FCSA and capillary supply as part of an avoidance strategy, whereas hamsters increase muscle capillarity in part as a consequence of disuse atrophy.

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