# Power @ changing temperatures

Discussion in 'Power Training' started by grom, Mar 25, 2005.

1. ### grom New Member

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Power is Power

however it is 2celcius now it will be 6 celcius tomorrow and 10 on sunday
wind speed will be 9kph for all 3 days of course these are all predictions lol

my question is
if i ride the same course 3 days straight at 225 watts for 15 minutes will there be a speed fluctuation if so how much can one expect and is there a website to calculate this i would like to see what happens to speed when the temp goes from 2c to 22c when i ride the same exact route., also what would be the fastest temperature to ride if there is such a thing?

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2. ### ric_stern/RST New Member

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yes there will be a change in velocity, and in very hot conditions your velocity will be highest even though your power maybe reduced, due to decreased air density (higher velocity).

You can model the various situations at www.analyticcycling.com

ric

3. ### wilmar13 New Member

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Ok lets neglect the effects of air resistance. Say I am climbing a 12% grade that is 6km long. It sure seems like I can make more power if it is 16 Deg C than when it is 35 Deg (and go faster as well). Is this psychological, or is there a physiological reason, and if so what is it. Is it only that if you are overheated your performance suffers, or is there a relationship between body temp and performance i.e. you have the potential to make the same power until you over-heat regarless of outside temps (neglecting extreme cold) lets say a range between 0-40 deg C???

4. ### velomanct New Member

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just ride.

paralysis by analysis............i.e. overtraining more likely

5. ### in.10.city New Member

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But the impact of the viscosity of your chain lube and the rotational friction at the chainlink pins as they move through the drivetrain is such an enthralling topic... (I'm an engineer so it really is but I'm not ready to break out into a finite element modeling analysis of it right now ...)

6. ### wilmar13 New Member

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So is there no difference in power output until your body begins overheating? How do you determine overheating?

7. ### wilmar13 New Member

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I am not retarded. I am talking in terms of repeated generalities, not a one time "it seemed to be harder" type of deal.

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