Smart Data Models Program adaptation of the original IoTData data Models. This Resource describes a measured heart rate by the current Zone using the Zoladz method. The Zoladz method defines Zones based on maximum heart rate; Zone 1 is the lowest, Zone 5 is the highest. The heartRateZone is an enumeration containing one of: ‘Zone1’, ‘Zone2’, ‘Zone3’, ‘Zone4’, and ‘Zone5’.