Only, "I would have the dancers move in the silence between beats," he said before the performance.

This meant increased power to the muscle, and a longer period of relaxation between beats.

A rare third one features both artists and switches between beats.

In one case, the time between beats was a staggering 26 seconds.

The heart rate may alternate between slow and fast beats.

"What we measure is the precise time between beats," he said.

The relationship between individual beats and shots is not direct.

It stood empty and still now, a heart between beats.

In patients with the syndrome, the heart takes longer to recharge itself between beats.

Or the heart muscle may not relax between beats as it normally does.