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. 2019 Aug 28;16(17):3126. doi: 10.3390/ijerph16173126

Table 2.

Prediction equations used in ActiLife® to obtain METs from the ActiGraph (AG) accelerometer.

Monitor The Equation Used to Calculate METs
AG (Freedson) 1.439008 + 0.000795 × VT count/minute
AG (Santos-Lozano VT) 2.118089 + 0.000662 × VT count/minute
AG (Sasaki) 0.668876 + 0.000863 × VM count/minute
AG (Santos-Lozano VM) 1.546618 + 0.000658 × VM count/minute

Note: METs: metabolic equivalents, VT: vertical axis, VM: vector magnitude.