Is there any validation study available for the ACSMs equation for measuring Metabolic equivalents (workload/energy expenditure) during the exercise treadmill test please? Ideally with calorimetery or Doubly labelled water as the criterion.
Hills, A. P., Mokhtar, N., & Byrne, N. M. (2014). Assessment of Physical Activity and Energy Expenditure: An Overview of Objective Measures. Frontiers in Nutrition, 1, 5. http://doi.org/10.3389/fnut.2014.00005
You may find this article helpful. The MET is used to categorize PA intensity. It is useful for describing and prescribing exercise of different intensities, but is not an accurate or precise measure as body weight and body fat varies between individuals.