ark@alice.UucP (Andrew Koenig) (03/06/86)
I asked this question some time ago and never got a clear answer, so I'm trying again. Is there an easy way to figure out how many calories are burned by a given amount of exercise, given that I can actually measure energy output? For example, suppose someone puts out 150 watts for 15 minutes. How many calories of intake are necessary to produce that much output?
jin@hropus.UUCP (Jear Bear) (03/06/86)
To answer you literally: No input is necessary to output that amount of energy, the body will usually have enough stored energy. To calculate kilocalories (the nutritionist's type) multiply watt-hours by 0.8605 So your example (if my memory serves me correctly) is .8605*(150.*15./60.) or 32.27 (rounded) kcals. -- Jerry Natowitz ihnp4!houxm!hropus!jin The Master Baker
ahs@burl.UUCP (Spinks Albert H. ) (03/07/86)
Think about your problem with the simple engineering equations output = input - losses OR output = (efficiency)(input) You say you can measure your output in some way; so all you need is the value of losses or the efficiency of the body (which I would guess is low). I don't know what our efficiency is but someone on the net should know. Good luck. -- Albert H. Spinks
hollombe@ttidcc.UUCP (The Polymath) (03/10/86)
In article <5079@alice.uUCp> ark@alice.UucP (Andrew Koenig) writes: >Is there an easy way to figure out how many calories are burned >by a given amount of exercise, given that I can actually measure >energy output? > >For example, suppose someone puts out 150 watts for 15 minutes. >How many calories of intake are necessary to produce that much >output? Multiply watts by 9.481 * 10^-4 to obtain BTU/second. Multiply BTU by 2.520 * 10^-1 to obtain kg calories. Source: Pratt & Whitney Aeronautical Vest-Pocket Handbook -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ The Polymath (aka: Jerry Hollombe) Citicorp(+)TTI 3100 Ocean Park Blvd. Geniuses are people so lazy they Santa Monica, CA 90405 do everything right the first time. (213) 450-9111, ext. 2483 {philabs,randvax,trwrb,vortex}!ttidca!ttidcc!hollombe
werner@aecom.UUCP (Craig Werner) (03/11/86)
> Is there an easy way to figure out how many calories are burned > by a given amount of exercise, given that I can actually measure > energy output? Is there an easy way. No. The only completely accurate way is to build yourself a calorimeter and measure the change in ambient temperature. These are very expensive, and very tricky. If you were the person who specifically asked the dependence on caloric expenditure of different manners fo stairclimbing, the answer is that the experiment has probably never been done, since two-level calorimeters are not practical. -- Craig Werner !philabs!aecom!werner I'll also entertain gifts,knick-knacks,offers of money, & proposals of marriage