Table 1.

Expected signs of median accelerations provided by tri-axial wrist-worn accelerometers during sitting and upright body posture.

Sensor Position	L1	L2	L3	L4	R1	R2	R3	R4
x-axis (upright)	+	-	+	-	+	-	+	-
y-axis (sitting)	+	-	-	+	-	+	+	-
z-axis (sitting)	-	-	+	+	-	-	+	+