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A new study published in the International Journal of Sports Medicine - (Power responses of a rowing ergometer: mechanical sensors vs. Concept2 measurement system. Int J Sports Med. 2006 Oct;27(10):830-3. Epub 2006 Apr 11.) suggests that the Concept II Performance Monitor underestimates the actual power produced as measured by strain guage sensors applied to the handle by some 25W. This would only have an impact on researchers - but if like the weightlifter who likes to tell the world how much he can "bench" you like too brag about your erg power - feel free to add 25W to your measure!