A study published in journal Nature Communications has found problem of arrhythmias in marine mammals when they performed deep-dives. Research team from the University of California, Santa Cruz, explained that for deep diving one needs to hold breath for long periods to conserve oxygen. Humans who perform deep diving are aware of the fact that whenever they dive into deeper depths, they risk heart trouble.
When the marine mammals hold breath, it puts pressure on the heart and longer they dive, the risk factor increases for the heart. The research has found that the same risk is being faced by deep-diving mammals like seals and dolphins.