Rodents at
night are much more active - to search for food, to escape predators,
and to generate heat. As a result, their blood pressures are much higher.
Mouse during the night
Average systolic pressure =
125 mmHg
Average diastolic pressure =
90 mmHg
Average mean pressure =
111 mmHg
Heart rate = 580 beats per minute
Mouse
during the day
Average systolic pressure =
101 mmHg
Average diastolic pressure =
77 mmHg
Average mean pressure =
87 mmHg
Heart rate = 480 beats per minute
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2002 Williams College