. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 1960 MAM MALI AN HIBKKNATION of its original value in fifteen minutes and the blood pressure drop precipitously, still the latter remained in the lower part of the range found in the resting, awake animal. After heart rate and blood pressure declined, the body temper- ature started to decrease. Often after a few minutes the heart rate again speeded and the Mood pressure rose. This was fol- lowed l>y a rise in body temperature. A second decline in heart rate and blood pressure was again followed by a drop in body te
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 1960 MAM MALI AN HIBKKNATION of its original value in fifteen minutes and the blood pressure drop precipitously, still the latter remained in the lower part of the range found in the resting, awake animal. After heart rate and blood pressure declined, the body temper- ature started to decrease. Often after a few minutes the heart rate again speeded and the Mood pressure rose. This was fol- lowed l>y a rise in body temperature. A second decline in heart rate and blood pressure was again followed by a drop in body temperature. Although the heart and abdominal temperatures were not the same at the beginning of the hibernating state, they. //cc/es Fig. 1. Blood pressure, heart and abdominal temperature, and heart rate of ground squirrel entering hibernation. Blood pressure in dark area is highest systole and lowest diastole recorded every four minutes for a one- minute period. Note declines in heart rate and blood pressure, followed by body temperature. soon became identical and remained the same until the animal was near the temperature of the environment. At this time the heart temperature was about °C above the abdominal tempera- ture and remained so while the animal stayed in hibernation. During the first part of entrance into hibernation, heart rate and blood pressure were irregular. Bradycardia often occurred for a few seconds followed by tachycardia, with a concurrent decline and rise in blood pressure (Figs. 1 and 2a). As the entrance into hibernation proceeded, the pattern of the heart. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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