When riding my bike outside I get a much higher score on Anaerobe effect than compared to riding on Zwift. Outside it get logged directly to Garmin, but inside via Zwift. Today a spent 9 min in zone 5 and 16 min in zone 4, and 8 min in Zone 3 but Garmin only gives 1.0 in Anaerobe training effect. Yesterday on my outside ride logged directly in Garmin I 0 min in Zone 5, 4 min in Zone 4, and 20 min in Zone 3 and that gave 2.2 in Anaerobe Training Effect.
My Zwift ride had higher average puls and zones, but Garmin gives a low anaerobe score. Why is that? Do I need to change setup or anything? Please advise ! 
