How many kilocalories per kg per hour would expend exercising at 6 METS?
The answer to this can only be approximated. To do it, you need
to know the oxygen consumption at 6 METS. The standard assumption
for this is that 1 MET is 3.5 ml/min/kg of body weight. Now you
need to know how many Calories are burned for each ml/min of VO2.
This again, is only an approximation, because the answer depends on
assumptions about muscle efficiency and fuel burned. When the RQ
(ratio of VCO2/VO2) is about 0.8, we burn about 4.8 Cal per liter
of VO2 (source: ACSM resource manual). So, here we go:
6 METS = 6 x 3.5 = 21 ml/min/kg of VO2. Assume a 70-kg body
weight, this gives VO2 of 1.47 l/min. Now multiply by the KCal
factor to get 7 Cal per minute, or 420 Cal per hour. Putting the
answer in units per Kg as requested, gives 420/70 = 6
Cal/kg/hour.
6 METS is about 3.5 MPH at 5% grade (brisk walk up slight
hill).
Ken Beck
Exercise Physiologist, and
Research Scientist, Boston Scientific Corp