Hiking calories burned too high?

Hey everyone,
I was just wondering if anyone else was feeling like cross-country hiking is a little too high in the MFP database. Its kicking my butt but at the same time I feel like the burn in the database is extraordinarily high. Substituting with walking seems a little too low of a calorie burn for the level of hiking I've been doing (we're climbing rocks, mountains, and navigating pretty uneven terrain).

Has anyone checked this with a heart rate monitor or anything? Have any thoughts on the matter?

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