Energy expenditure during common sitting and standing tasks: examining the 1.5 MET definition of sedentary behaviourReportar como inadecuado

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BMC Public Health

, 15:516

Health behavior, health promotion and society


BackgroundSedentary behavior is defined as any waking behavior characterized by an energy expenditure of 1.5 METS or less while in a sitting or reclining posture. This study examines this definition by assessing the energy cost METs of common sitting, standing and walking tasks.

MethodsFifty one adults spent 10 min during each activity in a variety of sitting tasks watching TV, Playing on the Wii, Playing on the PlayStation Portable PSP and typing and non-sedentary tasks standing still, walking at 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, and 1.6 mph. Activities were completed on the same day in a random order following an assessment of resting metabolic rate RMR. A portable gas analyzer was used to measure oxygen uptake, and data were converted to units of energy expenditure METs.

ResultsAverage of standardized MET values for screen-based sitting tasks were: 1.33 SD: 0.24 METS TV, 1.41 SD: 0.28 PSP, and 1.45 SD: 0.32 Typing. The more active, yet still seated, games on the Wii yielded an average of 2.06 SD: 0.5 METS. Standing still yielded an average of 1.59 SD: 0.37 METs. Walking MET values increased incrementally with speed from 2.17 to 2.99 SD: 0.5 - 0.69 METs.

ConclusionsThe suggested 1.5 MET threshold for sedentary behaviors seems reasonable however some sitting based activities may be classified as non-sedentary. The effect of this on the definition of sedentary behavior and associations with metabolic health needs further investigation.

KeywordsMET Energy expenditure Sedentary behavior Physical activity  Download fulltext PDF

Autor: Maedeh Mansoubi - Natalie Pearson - Stacy A Clemes - Stuart JH Biddle - Danielle H Bodicoat - Keith Tolfrey - Charlotte 



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