SmO2 levels can vary greatly depending on the individual’s fitness level and the type of workout. However, we’ve compiled a list of SmO2 data from over 1000 workouts and here are the average SmO2 levels:
Average 63 ± 10%
Maximum 72% ± 10%
Minimum 52 ± 17%
This is different than SpO2 values that a pulse oximeter measures, which are usually in the 90-100% range. This is because SpO2 measures oxygen supply, while SmO2 captures utilization.
The change in SmO2 throughout a workout is particularly important to understand how hard you are pushing yourself.