What are the minimum and maximum heart rates of a blue whale?

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Blue Whale Heart Rates Range Significantly During Dives and Surface Activity

Scientists have recorded blue whale heart rates as low as two beats per minute during deep foraging dives, with a maximum rate of 37 beats per minute observed when the animal surfaces to breathe. These findings provide crucial insights into the physiological extremes of the world's largest creatures. The research, which involved attaching an electrocardiogram machine via suction cups to an adult male blue whale off the coast of California, yielded approximately nine hours of data.
Minimum Heart Rate During Foraging Dives

During deep dives undertaken for feeding, the blue whale's heart rate dropped dramatically, reaching a minimum of two beats per minute. Typically, during these foraging dives, the heart rates were observed to be between four and eight beats per minute. This significant reduction in heart rate is a physiological adaptation to the demands of deep-sea foraging.
Maximum Heart Rate Recorded

Upon returning to the surface to breathe after a foraging dive, the blue whale's heart rate increased substantially. The highest heart rate recorded in the study was 37 beats per minute. This elevated rate reflects the physiological response as the mammal resumes breathing at the surface.
Method of Measurement

The data was collected using a specially designed tag encased in an orange plastic shell, equipped with an electrocardiogram machine. This device was attached non-invasively to the whale using four suction cups, positioned just behind the left flipper, an area believed to be closest to the heart. The deployment of the tag required careful timing and positioning from a boat as the whale surfaced to breathe.
Physiological Context of Large Animals

Generally, larger animals tend to have lower heart rates compared to smaller ones, a principle that applies to the blue whale. This phenomenon allows their hearts to work more efficiently while distributing blood throughout their massive bodies. For comparison, human resting heart rates range from 60 to 100 beats per minute, while the smallest mammals, like shrews, can have heart rates exceeding a thousand beats per minute.

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What are the minimum and maximum heart rates of a blue whale?

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