Metabolic Equivalent of Task (MET)
A physiological concept expressing the energy cost of a physical activity as a multiple of Basal Metabolic Rate (BMR). By convention, 1 MET is considered as the resting metabolic rate obtained during quiet sitting.
The duration of physical activity in minutes above moderate intensity. A 4 MET activity expends 4 times the energy used by the body at rest. If a person performs a 4 MET activity for 30 minutes, he or she has done 4 x 30 = 120 MET-minutes of physical activity. A person could also achieve 120 MET-minutes by performing an 8 MET activity for 15 minutes.
Physical Activity Guidelines
Physical Activity Guidelines describe the types and amounts of physical activity that offer substantial health benefits to young, adult and elderly people. Several well-known guidelines are implemented (e.g. ACSM  and NNGB ), and the compliance with these guidelines is assessed.
Physical Activity recommendations use absolute aerobic intensity in terms of METs. According to the ACSM thresholds for adults :
- Light-intensity activities are defined as 1.1 MET to 2.9 METs.
- Moderate-intensity activities are defined as 3.0 to 5.9 METs.
- Vigorous-intensity activities are defined as 6.0 METs or more.
1. Adams, S. A., Matthews, C. E., Ebbeling, C. B., Moore, C. G., Cunningham, J. E., Fulton, J., & Hebert, J. R. (2005). The Effect of Social Desirability and Social Approval on Self-Reports of Physical Activity. American journal of epidemiology, 161(4), 389-398. doi:10.1093/aje/kwi054
2. Baranowski, T. (2013). Validity and Reliability of Self Report Measures of Physical Activity: an Information-Processing Perspective. Research Quarterly for Exercise and Sport, 59(4), 314-327. doi:10.1080/02701367.1988.10609379.
3. Haskell, W. L., Lee, I. M., , R. R., Powell, K. E., Blair, S. N., Franklin, B. A., Macera, C. A., Heath, G. W., Thompson, P. D., & Bauman, A. (2007). Physical Activity and Public Health: Updated Recommendation for Adults from the American College of Sports Medicine and the American Heart Association. Circulation, 116(9), 1081-1093. doi:10.1161/CIRCULATION.107.185649.
4. Nelson, M. E., Rejeski, W. J., Blair, S. N., Duncan, P. W., Judge, J. O., King, A. C., Macera, C. A., & Castandedasceppa, C. (2007). Physical Activity and Public Health in Older Adults: Recommendation from the American College of Sports Medicine and the American Heart Association. Circulation, 116(9), 1094-1105. doi:10.1161/CIRCULATIONAHA.107.185650.
5. American College of Sports Medecine. (2011). ACSM Issues New Recommendations on Quantity and Quality of Exercise. Retrieved from http://itswww.uvt.nl/lis/es/apa/apa-handleiding.pdf
6. Ministerie van volksgezondheid. (n.d). Nederlandse Norm Gezond Bewegen (NNGB). Retrieved from https://www.volksgezondheidenzorg.info/onderwerp/sport-en-bewegen/cijfers-context/huidige-situatie#definities
7. Martin, S. B., J. R. Morrow, JR., A. W. Jackson, and A. L. Dunn. (2000). Variables Related to Meeting the CDC/ACSM Physical Activity Guidelines. MEDICINE & SCIENCE IN SPORTS & EXERCISE, 32(12), 2087–2092. doi:10.1097/00005768-200012000-00019