4 weeks of ramped up milage should produce enough of a training effect to at least stave off detraining of the physiological benefits stressed by higher volume work. I would suspect that if high milage was last seen in the fall and then not returned to until 9-10 months later there would be some detraining effect on muscle enzyme profile, aerobic capacity, etc. Perhaps reducing weekly milage while still keeping in the weekly long run would prevent this detraining effect. When you reduce volume during indoor and outdoor track do you keep in the weekly long run?
ELITETRACK Founder