My question is should I try this outside again or do I need to work on muscle endurance?
If your last AeT test was outdoors, I would recommend doing an outdoor test for consistency and tracking progress with your AeT.
I’m just having a hard time believing I’m not within 10% after 6 month’s of continually zone 2 training getting an average of 4hrs or more a week in.
Uphill Athlete recently shared (on Facebook/Instagram) an experience of a member of this community on ADS. It took this athlete a year to go from an AeT of 135 bpm to 170 bpm. Progress will happen, but the timeline will vary by individual based on their baseline, training volume, fasted training, etc. and other factors unique to the individual. You might find this discussion helpful –
Fixing Aerobic Deficiency general timeline? tips?
Scott shares examples of volumes and timelines in the above forum discussion.
I know you say not to do any ME workouts in until within 10% but being so close is there any harm in doing them?
Do you have an event/trip coming up? If yes, then include Muscular Endurance (ME) in your training as it will help with your event. If not, doing ME workouts now will not be as effective as doing it when you have AeT within 10% of AnT.
When does one know if they no longer have ‘ADS’ (aerobic deficiency syndrome)? Is an AeT within 10% of AnT the best metric?
I don’t know if this is the best metric, but UA coaches have used this approach and see it work for all levels of athletes. As a recreational athlete, for me, that’s good enough. Keep it simple.