> Also, I think these things must measure oxygen (input - output) being > consumed rather than air intake. This is a little more sophisticated > than just measuring volume of flow since oxygen and/or carbon dioxide > content must be measured. O2 uptake would be much more meaningful than air intake. PC: this is true, but it would take more costly equipment, a simple heart monitor paddled over a longer steady state corse would yeild a relative comparison that would be useful. Of couse pure O2 uptake would be better, and if you are comparing the same person with different paddles, again you would get a reasonable comparison, you would get very different values from one person to the next depending on their metabolism, conditioning, etc. >However, it does bring up the issue of repeatability in tests. I'd like to know how one measure energy out accurately. While a knotmeter and GPS combo can give decent speed estimates, they'd have to be integrated over time and compared to O2 uptake over time as well. Then you'd have to know the speed vs resistance characteristics of the hull. You do not need any of this information to make a valid comparison. the same hull, at the same gross weight, at the same speed will take the same amount of power to push it though the water (presuming wind and currents are not a factor). What you get a the same power output with each paddle, what would vary is the amount of O2 uptake, or heartrate (once stablized to a steady state condition). Since presumable the O2 or heartrate would vary, the lower the O2 uptake, or heart rate, the less work the paddler is puting into the paddle to mantain the SAME speed (or power output). You do not need the to know the speed vs. resistance of the hull to measure relative paddle efficiency. Peter *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************Received on Mon Sep 20 2004 - 11:59:12 PDT
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