Select > Settings > System > Data Recording.

Recording Interval

Controls how the device records activity data. The Smart option records key points where you change direction, speed, or heart rate. The 1 Sec option records points every second. It creates a very detailed record of your activity and increases the size of the stored activity file.

Cadence Averaging

Controls whether the device includes zero values for cadence data that occur when you are not pedaling. The default setting excludes zero values that occur when you are not pedaling.