i.e. increased mitochondrial activity, and increased substrate utilization?
Personally i see no issues with mixing it up... particularly for someone trying to bust through a fat-loss plateau.
Everybody part in a week however... that's a stretch.
Particularly if you're preceding said set(s) with heavy multijoint work.
Remember... the body's recuperative and adaptive abilities, while impressive, aren't infinite.
You will be logging a recuperative deficit.
So be cognizant of that in your application of such a technique.
-CNS