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Ignacio Perez-Pozuelo, Thomas White, Kate Westgate, Katrien Wijndaele, Nicholas J. Wareham, and Soren Brage

the rotated gravitational field vector which can then be used to determine the accelerometer’s pitch and roll orientation angles. Pitch and roll of the device were derived according to these formulae: Pitch = − tan − 1 ( Y X 2 + Z 2 ) * 180 π Roll = − tan − 1 ( X Y 2 + Z 2 ) * 180 π As the monitor was