Table 2.

Features extracted for each body location. Features were extracted from acceleration and angular velocities of eight body segments (top) and from the angles of six joints (bottom). Additionally, shock attenuations were computed between the left tibia and pelvis, and between the right tibia and pelvis.

Body Segments
Left Foot			Right Foot			Left Tibia			Right Tibia			Left Hip			Right Hip			Pelvis			Sternum
Biomechanical features
Peak acceleration			Peak acceleration			Peak acceleration			Peak acceleration			Peak acceleration			Peak acceleration			Peak acceleration			Peak acceleration
Peak ang. Vel 1			Peak ang. vel			Peak ang. vel			Peak ang. vel			Peak ang. vel			Peak ang. vel			Peak ang. vel			Peak ang. vel
						Shock attenuation (with pelvis)			Shock attenuation (with pelvis)
Statistical features
Mean acceleration			Mean acceleration			Mean acceleration			Mean acceleration			Mean acceleration			Mean acceleration			Mean acceleration			Mean acceleration
STD acceleration			STD acceleration			STD acceleration			STD acceleration			STD acceleration			STD acceleration			STD acceleration			STD acceleration
IQR acceleration			IQR acceleration			IQR acceleration			IQR acceleration			IQR acceleration			IQR acceleration			IQR acceleration			IQR acceleration
Skew. acceleration			Skew. acceleration			Skew. acceleration			Skew. acceleration			Skew. acceleration			Skew. acceleration			Skew. acceleration			Skew. acceleration
Kurt. acceleration			Kurt. acceleration			Kurt. acceleration			Kurt. acceleration			Kurt. acceleration			Kurt. acceleration			Kurt. acceleration			Kurt. acceleration
Mean ang. vel.			Mean ang. vel.			Mean ang. vel.			Mean ang. vel.			Mean ang. vel.			Mean ang. vel.			Mean ang. vel.			Mean ang. vel.
STD ang. vel.			STD ang. vel.			STD ang. vel.			STD ang. vel.			STD ang. vel.			STD ang. vel.			STD ang. vel.			STD ang. vel.
IQR ang. vel.			IQR ang. vel.			IQR ang. vel.			IQR ang. vel.			IQR ang. vel.			IQR ang. vel.			IQR ang. vel.			IQR ang. vel.
Skew. ang. vel.			Skew. ang. vel.			Skew. ang. vel.			Skew. ang. vel.			Skew. ang. vel.			Skew. ang. vel.			Skew. ang. vel.			Skew. ang. vel.
Kurt. ang. vel.			Kurt. ang. vel.			Kurt. ang. vel.			Kurt. ang. vel.			Kurt. ang. vel.			Kurt. ang. vel.			Kurt. ang. vel.			Kurt. ang. vel.
Joint angles
Left ankle				Right ankle				Left knee				Right knee				Left hip				Right hip
Biomechanical features
IC 1 (peak)				IC (peak)				IC (peak)				IC (peak)				IC (peak)				IC (peak)
Mid Stance (peak)				Mid Stance (peak)				Mid Stance (peak)				Mid Stance (peak)				Toe off (peak)				Toe off (peak)
Toe off (peak)				Toe off (peak)				Toe off (peak)				Toe off (peak)				Mid Swing (peak)				Mid Swing (peak)
Left-right difference								Mid Swing (peak)				Mid Swing (peak)				Left-right difference
								End Swing (peak)				End Swing (peak)
								Left-right difference
Statistical features
Mean				Mean				Mean				Mean				Mean				Mean
STD				STD				STD				STD				STD				STD
IQR				IQR				IQR				IQR				IQR				IQR
Skewness				Skewness				Skewness				Skewness				Skewness				Skewness
Kurtosis				Kurtosis				Kurtosis				Kurtosis				Kurtosis				Kurtosis

¹ ang. vel. = pitch angular velocity; IQR = inter-quartile range; STD = standard deviation; Skew = skewness; Kurt = kurtosis; IC = initial contact.