Isometric calorie burn vs. weight lifting cal burn

All--

Suppose I curl a 20 lb weight, as many reps as I can, for one minute.
Suppose I take a 20 lb weight, and *hold it at the "sticking point" (approx.
90 deg)* for one minute.

Which would burn more calories, and why?
Note that at all points in the ROM other than the sticking point, the motion
is easier than at the sticking point, so conceivably more metabolic energy
could be expended by just holding the weight at that one difficult point.

If the answer to this particular exercise is not in favor of isometrics, is
there a way to make isometrics burn more calories by varying the technique?
Apply at more points in the ROM, perhaps?

TIA.
--
Mr. P.V.'d (formerly Droll Troll), Yonkers, NY
Ever-preparing for The Grand Insertion
Party Nominee, IPPVM
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all d'numbuhs