along somewhat similiar lines...a good quote from Poliquin...in answering which rep scheme to use during fat loss:
"The secret here is to know your fiber type. If you're gifted more to be a 100 meter sprinter (predominantly fast twitch type IIb), stick to sets of five, lots of rest, etc. when you're in a fat loss phase.
If you're a natural 800 meter runner (predominantly fast twitch type IIa), stick to the lactate style of training.
In calorie restricted states, if you're predominantly fast twitch and you use the higher rep, higher lactate style of training, you'll actually lose muscle mass. Likewise, a type IIa guy will lose muscle mass if he's training with low reps.
So both approaches are right; it just depends on the kind of animal you are."