. Author manuscript; available in PMC: 2019 Nov 1.

Published in final edited form as: Med Sci Sports Exerc. 2018 Nov;50(11):2285–2291. doi: 10.1249/MSS.0000000000001691

Table 1.

Description of monitor-based estimates of moderate-vigorous intensity physical activity

Calibration type	Method	Technical Details (monitor)		Calibration Study Details
Calibration type	Method	AG Model^*/Epoch length	Axis measured	Number/type of activities	Modeling/prediction approach	Intensity Classification

Ambulatory
	Freedson	7164/60 sec	Vertical (VT)	3 / walking, running	Linear regression	1952 VT cts/min
	Sasaki	GT3X/60 sec	3-dimensions; Vector Magnitude (VM)	3 / walking, running	Linear regression	2690 VM cts/min
	activPAL	Not applicable/20 Hz	3-dimensions	Stepping (cadence)	Linear regression	3+ METs
Lifestyle + Ambulatory
	Matthews	7164/60 sec	Vertical (VT)	13 / lifestyle and walking activities; refined vs. free-living indirect calorimetry	None	760 VT cts/min
	Crouter	7164/10 sec	Vertical (VT)	18 / lifestyle + walking, running activities	2 regression equations (moving average)	3+ METs
	Sojourn3×	GT3X/1 sec	3-dimensions	30 / lifestyle and walking, running activities	Hybrid machine learning and neural networks	3+ METs

AG = ActiGraph