True Fitness CS8 Owner's Manual page 84

Appendix B
METs are defined as the ratio of the current body energy
MET
expenditure rate compared with basal metabolic rate (BMR):
Explanation
METs = (VO2 rate of current state) / 3.5
where 3.5 represents BMR. VO (oxygen uptake) and 3.5 are in
2
units of ml/kg/minute of oxygen consumed by the body. This
oxygen consumption rate corresponds to about 72 calories per
hour for a 150-pound person.
CS 8.0 Owner's Guide 95