Hi Frank. To answer your questions:
I’m 54 y/o and eat a decent diet. Green beans and grapes daily, along with the normal assortment of foods (e.g., sausage, eggs, protein drink).
I’ve been riding for about 5 years but not training consistently until this year.
Recently (about a month ago) moved from mostly aerobic rides into power intervals. This coincides with my cold symptoms.
I have a stable work environment without much physical interaction - no travel.
I don’t sleep much more than about 6 hours per night. I have the time, But my body wakes up. On occasion I will sleep a full 8 hours, but that’s only maybe once per month. I’m just not a sleeper.
Interestingly, this weekend I stopped short of 500 tss (480) and no cold symptoms. So you can see why I made the connection, right or wrong.
Training for the famous annual TUCSON century in November: El Tour de TUCSON.
This week I have some extra training time and plugged about 3 extra hours of aerobic rides in, but it runs the tss up over 600.
Any guidance would be greatly appreciated.