The Polar Team App, from heart rate monitoring company Polar, allows athletic trainers to monitor the heart rates of up to 40 athletes at once by utilizing Bluetooth technology.

Each player wears a Bluetooth sensor that monitors the heart rate and communicates with a central processor.

Following heart rates allows coaches to see how hard a player is really working and to watch out for danger signals that might point out possible injury scenarios.

The Polar technology is being promoted as a cost effective way for volleyball coaches to manage individual and team training regimens.

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