Choir singers not only harmonise their voices, they also synchronise their heartbeats, a study suggests.

Researchers in Sweden monitored the heart rates of singers as they performed a variety of choral works.

They found that as the members sang in unison, their pulses began to speed up and slow down at the same rate.

Writing in the journal Frontiers in Psychology, the scientists believe the synchrony occurs because the singers coordinate their breathing.

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