Videre non videri
Join Date: Sep 2004
Location: Gothenburg, Sweden
Bikes: 1 road bike (simple, light), 1 TT bike (could be more aero, could be lighter), 1 all-weather commuter and winter bike, 1 Monark 828E ergometer indoor bike
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The current best theory is that the soreness you get the day after a workout, is a slight swelling of the muscle fibres, after they've healed/hypercompensated for the load during the workout. So, any "healing" process is already long since over when you get sore. Lifting again should not be harmful. But if you're sore, you're likely to be forced to go down in weights, and you get a less efficient workout, perhaps. So why not wait?
After a few "cycles" of working a particular muscle group, you'll rarely, or never, get sore afterwards again.