Exertion & calories

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Offline DoctorBeaver

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Exertion & calories
« on: 07/06/2007 08:53:58 »
A person walks a mile along a flat road & times himself.

The next day he runs the same mile and when he's done that, he sits down for the rest of the time it took him to walk it. Let's say that all things in the environment are equal (i.e. same temperature, humidity etc), would he have used more calories by running the mile then sitting & waiting, or by walking it?

Obviously running burns more calories in a given period of time; but walking means a person burns less calories for a longer period of time.
« Last Edit: 07/06/2007 08:56:47 by DoctorBeaver »
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lyner

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Exertion & calories
« Reply #1 on: 08/06/2007 23:49:25 »
If we were dealing with a simple system - e.g. a wheeled vehicle at LOW speeds,  then there would not be much difference in fuel consumption. However, air resistance increases dramatically at high speed so there would definitely be higher fuel consumption in the high speed option. The work done against friction would be force times distance,  so more energy would be needed.
The losses associated with walking and running are much more complicated and you wouldn't expect equal food consumption.  All that bouncing up and down whilst running must involve more energy.
The best option is to go slowly enough to get there' on time'.


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Offline DoctorBeaver

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Exertion & calories
« Reply #2 on: 09/06/2007 00:02:22 »
Thank you, Sophie.
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