Too hard to me to tell...I'm more of a recreationally paced rider myself.
Check with the Training & Nutrition forum folks--they will be able to help answer those questions better than I can.
http://www.bikeforums.net/forumdisplay.php?f=148
East Hill
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TRY EMPATHY & HAVE LOVE IN YOUR HEART, PERHAPS I'LL SEE YOU ON THE ROAD...