How is the PowerCal any different (why is it better) than a Heart Rate Monitor?
First, it introduces the relationship of a dose vs. training.
The PowerCal contains an algorithm that is sensitive to acute changes in Heart Rate (HR) and can account for rapid changes in power output.
It translates conversations into the vernacular of power training: watts, kilojoules, peak power, FTP, etc.
Current power meter users can now have uninterrupted training load data for activities where power meter data may be unavailable, like commuting or MTB riding.