Robert Walls said:Joe User said:According to the Compendium of Physical Activities
[1], for a "typical" person who weighs 263 lb, walking
at 3 MPH for 1 hr burns about 400 kCal, whereas
running at 6 MPH for 30 min -- the same 3 miles --
burns about 600 kCal.
[....] Thank you for this correction! [....] When I
walked at
5.5 mph for 40 minutes, I suspected that I was burning
more calories than walking the same distance covered at
a slower rate of speed as I do now, 4.2 mph.
Well, I believe that is true. But I hasten to point out that
I was comparing running and walking over the same distance,
not walking at different speeds over the same distance. That
is a very different question.
Nonetheless, I do disagree with those who claim that
walking at different speeds burns the same number of
calories per mile. Those who assert that position often
note that we burn the same number of calories per mile at 2
MPH and 4 MPH. But according to the Compendium [1], that is
the exception, not the rule.
According to the Compendium, a "typical" person burns 5.0,
6.3 and 8.0 MET (kCal/kg/hr) at 4.0, 4.5 and 5.0 MPH
respectively. Thus, a 263-pound person burns 149, 167 and
191 kCal/mile at those speeds.
A linear curve is a close fit between 3.5 and 5.0 MPH [2].
Based on that, I estimate that a "typical" 263-pound
person burns 159 and 200 kCal/mile at 4.2 and 5.5 MPH
respectively [3].
But of course, no one is "typical" :-).
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[1] prevention.sph.sc.eduCompendium tracking.Open ↗
pdf, updated in 2000. Originally published by B.E.
Ainsworth et al, "Compendium of Physical Activities:
Classification of Energy Costs of Human Physical
Activities", Medicine and Science in Sports and
Exercise, Vol. 25, No.1, 1993.
MS-SE is the journal of the ACSM. See ms-ms-Open ↗
se.com.
[2] Arguably, an exponential curve is a better fit between
3.5 and 5.0 MPH. But I believe a linear curve is "close
enough", if not correct.
[3] I estimate 5.6 and 9.2 MET (kCal/kg/hr) at 4.2 and 5.5
MPH respectively.