Watts speed and weight question

cadence230

I have been very interested in watts and body weight for an individual. The specific interest I have been searching for is the relationship of weight loss or gain has on watts. For instance in a controlled test for the individual that weighs X amount of kg then losses X amount of body fat and the individual applies the same watts in a controlled experiment how does the change in weight affect wattage? For instance if I picture a cyclist going up a 6% hill with repeatable environmental conditons, bike etc and he goes up the hill at 6 mph at 200 watts then the same person does the same experiment after loosing 10lbs of fat what will the watts be to do the same xperiment? The specific watts is not necessarily the answer I am looking for but a ratio of weight lose to watts/speed perhaps? For instance 10watts per pound in general? I hope I made myself clear. I am starting to confuse myself. Mike

gee.bike

its a hard question to answer because there are so many different variables. But I think it is about 1 pound = 5watts.

toa

You can use Analyticcycling.com, this is currently the best online physical&mathematic bike relate modellere-site!

For example performance in breakaways:
http://www.analyticcycling.com/WheelsBreak_Page.html

performance in climbing:
http://www.analyticcycling.com/WheelsBreak_Page.html

During Indurains 1-h record attempt, a very comprehensive study was done on his characteristics: frontal area, drag, watt, speed etc. You can use the formulars in the study for estimating effect on wattage on level riding:
http://jap.physiology.org/cgi/content/full/89/4/1522

Aaberg

If you assume that your weight loss comes completely from loss of fat, and not from loss of muscle or fitness, then there is no relationship.

Same as above. It does not affect wattage.

The watts will be the same, however, your speed will increase because your watts/kg has increased.

_______
Aaberg