Eternal Cat3 Rookie
Join Date: Jul 2006
Location: Atlanta, GA
Bikes: 2004 Giant TCR2 Composite & 2006 Fuji Touring
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I think you may be referring to the muscle glycogen replenishing window thingamajiggie...
15 minutes after you exercise, your muscles accept glycogen replacement at a ridiculously high rate, so if you eat carbs, they get metabolized super quickly. 30 minutes after you still get a very high metabolism rate. 2 hours you have a high rate of glycogen replacement, but it's not as high as the 0-30 minute window. After 4 hours it starts tapering back to normal...
That's why it's crucial after a hard or long ride to immediately eat almost as many carbs(and protein) as you did to preload(if you did) before the ride, if you want to speed up muscle recovery. There are lots of energy recovery drinks on the market, but some people just drink an Ensure or Slimfast.
The muscle repair uses extra calories for sure, but I don't think it's what increases your metabolism to a "cranked-up" level. Although, as you add muscle mass in general, it will be burning more calories just by being there, so you will basically have a higher "metabolism" with more muscle.
Anyone want to expound on this?