... subject is in a resting position as well as in the act of performing four types of motions: horizontal and verticalmovements of the hand, and bending and pressing motions of the finger. For ... with the clini-cal findings discussed in [7], which suggested that bend-ing and/or pressing the finger may cause the irregularcompression of the vascular bed between the emitter anddetector of ... of the hand, as well as the bending motion and pressing motion of the fingerFigure 5 The error distributions of SpO2, obtained by the SPWVD approach, when subjects performed different types of...