The 187/63 shown in this Instinct manual picture of the Heart Rate Widget, the 187 reflects the highest OHR reading in the last 4-hours and the 63 represents the lowest reading in the last 4 hours.
The number below the line may indicate:
* minimum heart rate
* recovery heart rate (RHR)
* or resting heart rate ... I would also like to know the answer to your question ...
The 187/63 shown in this Instinct manual picture of the Heart Rate Widget, the 187 reflects the highest OHR reading in the last 4-hours and the 63 represents the lowest reading in the last 4 hours.