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The energy from a beating heart can be harnessed to power a pacemaker, scientists have found.

In the experimental device, a team of US researchers used piezoelectricity, which is energy produced from mechanical pressure, to convert energy from a beating heart.

They generated enough electricity to power a pacemaker, according to the British Heart Foundation.

Piezoelectricity may also be able to power other implantable cardiac devices such as defibrillators, according to the research, which was presented at the American Heart Association's Scientific Sessions.