If a man walks at four miles an hour and burns 100 calories a mile
(400 calories an hour), I understand that if he runs at 8 miles an
hour he still burns 100 calories a mile but is now up to 800 calories
an hour.  First of all, is this correct (generally speaking) but what
is the rate for riding a bike the same distance?  Riding bike for 8
miles- is it 800 calories or something less?  Not coasting, pedaling
on level pavement.

Redshark66 ?

I use a fitness program on the web called FitLinx.  It?s a membership
site but there?s no charge for a membership.  They link to exercise
tracking systems at many YMCA workout facilities and allow you to
enter numbers for outdoor exercise too.

All of the below are at an ?average? pace for a man of 190 pounds:

Walking: 618 calories (4 miles, 1 hour)
Running: 1,451 (8 miles, 1 hour)
Biking: 251 calories (8 miles, 1 hour)
Trail biking: 770 calories (8 miles, 1 hour)

FitLinx
http://www.fitlinx.com/main.asp

Best regards,

Omnivorous-GA

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Request for Answer Clarification by redshark66-ga on 16 Sep 2005 19:30 PDT

I'm sorry I wasn't more clear about the biking thing.  What I was
trying to ask is if I am going at a good pace on a bike (16 mph?) how
long do I have to ride to burn the same number of calories as walking
one hour (400 calories).  And yes- I weight 190 pounds- you are
clairavoyant!

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Clarification of Answer by omnivorous-ga on 17 Sep 2005 06:31 PDT

Redshark66 --

I increased the biking distance to 16 miles and also increased the
intensity from 5/10 to 8/10 because I bike quite a bit and know that
will work up some body heat.  The FitLinx calculator shows 618
calories at 16.4 miles in 1 hour.

Best regards,

Omnivorous-GA

This question was also answered in Yahoo with practical tool links 
http://ask.yahoo.com/20050906.html
if you click on the 'graph' link you will get a pretty good 
calories/speed/distance graph. It is not only a matter of
distance/weight but speed/resistance. Also if you use the calorie
calculator link on the bottom you can get numbers (without
explanations) for just about any excersice you can think of.