Their extreme size has also fascinated scientists looking to understand their physiology—how they got to be so big and whether they could get any larger., a team led by Jeremy Goldbogen, from Stanford University, report how the were able to attach a heart monitor to a blue whale in California's Monterey Bay. The male, who is known to be at least 15 years old, was followed for 8.5 hours, during which it dove down over 600 feet for up to 16.5 minutes.
Findings showed that while diving, the whale's heart rate dropped to between four and eight beats per minute. At its lowest, it fell to just two beats per minute. After coming back up to the surface, the heart rate increased to 37 beats per minute—which is close to the estimated maximum heart rate of a blue whale.
The blue whale tagged by the researchers. The team found that during dives, the animal's heart rate could drop as low as two beats per minute.The team was surprised at their findings. The upper limit almost exceeded expectations, while the lower heart rate was about 30 to 40 percent slower than predicted. They believe blue whales must have specialized, stretchy aortic arches. This part of the heart helps push blood out to the body.
Amazing mammals... Amazing capabilities!
Two heart beats per minute? Is that even legal?
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