Both devices can store up to 20 hours of heart rate data during swims, and send real-time heart rate when the user is out of the water.
Garmin's vívofit fitness band has been chosen by Medidata because of the ease of use provided by its year-long battery life.
The navigation giant used the big show in Vegas to announce three new smart watches, updated Vivofit smart band and revamped online fitness community.
With a price tag of $449.99, Garmin's device caters towards serious athletes, delivering detailed stats on swimming, biking, and running.
Thanks to the built-in vibration mechanism, this fitness tracker doubles as a subtle alarm clock, and can also notify users on incoming calls, texts and more.
Under the deal, Garmin Connect users will be able to view their data in the MapMyFitness mobile apps, including MapMyRun and MapMyRide.