Functional Threshold Power (FTP)

Your functional threshold represents the maximum power output you can sustain for 1 hour. Your FTP estimate will form the basis for your personalized power zones and for most power-based training plans.

Your compatible Edge can detect your Functional Threshold either through a guided workout or automatically during a normal ride. Either way, by gathering heart rate data across a range of power outputs, the device will estimate your threshold in terms of power output. You will find your FTP estimate improves over time as your device learns your overall fitness level. Your compatible Edge also shows your FTP as a watts/kg value in relation to your weight and displays it on a rainbow gauge. This allows you to very quickly compare your own power-to-weight ratio against riders of different sizes.

Your compatible Edge can calculate your FTP with the following two ways:

Guided Test:

• Using heart rate and power data, Edge takes you through a warmup followed by a gradual increase of targeted effort in 3 to 4 minute increments over a period of 15 to 20 minutes.
• Based on your heart rate response to the increasing power effort, Edge calculates your FTP value.
• You have the option to accept or reject this value. If you accept, your power zones will automatically recalculate based on the new value.
• It is recommended this test is performed on a road with constant gradient or on an indoor trainer.

Auto FTP Detection:

• If you set a personal 20-minute average power record, and if 95% of this value exceeds your current FTP estimate, we will prompt you to accept a new FTP value.
• Again, you have the option to accept or reject this value.