warthog1 wrote:Wow, I didn't know it changed that much from fit to relatively unfit
I know nothing about power and training though
Well in my case it involved a lay off of 12 months from riding due to a confluence of factors, and probably 18-20 months away from any serious training, as well as being substantially heavier than when race fit.
It's an exercise physiology principle known as reversibility. IOW you will lose training induced adaptations if the training stimulus stops or is insufficient to maintain your current level.
For a trained racing athlete that trains all year but has peak fitness periods, then their threshold power will typically vary by ~ 10% from general to peak fitness during a season.
12 weeks after ceasing training, VO2max in highly trained endurance athletes can decline by 15-20%.