Figure 4From: Infant trunk posture and arm movement assessment using pressure mattress, inertial and magnetic measurement units (IMUs)R M S E arm values for various IMU sensor placements, compared to referential optoelectronic motion capture (Optotrak) values. EL2IMUs, H2IMUs, EL1UA, H1UA, EL1FA, and H1FA represent the R M S E arm values of elbow and hand coordinates for the 2 IMUs per arm, 1 IMU on the upper arm, and 1 IMU on the forearm sensor placements, respectively.Back to article page