Table 2 Mean ± sd of the reference (OPTO) and estimated (MIMU) angular RoM variables considered in the analysis.

From: Upper limb joint kinematics using wearable magnetic and inertial measurement units: an anatomical calibration procedure based on bony landmark identification

Type of motion

Angle

RoM [deg]

RMSD [deg] (% RoMOPTO)

R 2

a 1

a0 [deg]

OPTO

MIMU

Arm elev. frontal plane

β h

107.1 ± 17.5

95.5 ± 15.6

4.4 ± 4.1

(4.1%)

0.998 ± 0.003

0.921 ± 0.01

−7.8 ± 8.2

Arm elev. scapular plane

β h

105.9 ± 16.4

97.3 ± 15.5

2.5 ± 1.7

(2.2%)

0.997 ± 0.003

0.967 ± 0.06

−2.9 ± 7.5

Arm elev. sagittal plane

β h

114.3 ± 11.4

112.3 ± 10.8

2.3 ± 2.5

(2.2%)

0.997 ± 0.003

1.006 ± 0.05

0.9 ± 5.6

Shoulder axial rotation

γ h

44.9 ± 8.9

42.3 ± 8.1

1.8 ± 1.4

(4.1%)

0.995 ± 0.009

0.951 ± 0.07

−2.0 ± 4

Elbow flex-extension

α e

109.3 ± 13.9

108.1 ± 16.2

1.9 ± 2.6

(1.7%)

0.999 ± 0.002

1.003 ± 0.03

−0.4 ± 4.2

Elbow prono-supination

β e

119.5 ± 14.1

117.3 ± 15.5

2.9 ± 1.6

(2.4%)

0.997 ± 0.004

1.020 ± 0.03

−1.1 ± 1.5

  1. Median ± IQR are reported for RMSD (also expressed as percentage of the reference RoM, RoMOPTO) and for the three coefficients obtained from the Linear Fit Method R2 (coefficient of determination, i.e. waveform similarity), a1 (slope, i.e. amplitude) and a0 (intercept, i.e. offset) used for comparing pairs of reference and estimated angular trajectories.
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