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Want More Power? Crank Length Matters!

Will the change to shorter cranks (160mm) on my 61 cm Specialized Tarmac reduce my Cycling Power? I need to use shorter cranks to help manage the osteoarthritis pain in my hips. I already know that shorter cranks are beneficial to opening my hip angle at the top of the pedal stroke, and have no negative impact on my heart rate and exertion with sustained cycling efforts, but what about POWER OUTPUT?! I set out to record 2 maximum out of the saddle uphill sprint efforts on a local steep climb. It is a 150 m segment with a 19% gradient. My aim was to give a 5 second maximum effort, then hold on for the rest of the segment. I did this first on my Trek Emonda, still with 175 mm cranks, then on my Specialized Tarmac which is now sporting 160 mm cranks. Even I was amazed at the result! Contents: 0:00 Intro 2:07 The Climb 3:04 Max Power Test with 175 mm Cranks 4:32 Max Power Test with 160 mm Cranks 5:06 Compare The Results 5:53 Another Marginal Gain? 6:50 More Evidence of More Power! 7:21 Shorter Cranks Benefit Summary 8:08 What Is Next? 8:28 175mm and 160mm Side By Side