Identification of the Causative Disease of Intermittent Claudication through Walking Motion Analysis: Feature Analysis and Differentiation
Table 1
Extracted features for differentiating among normal, PAD, L5 and L4, and which features are used in the presented SVM classifier-based methodology. The first row shows the target class for the binary classifier: for example, “normal” means the classifier for distinguishing the normal group from the other groups. “+” denotes the selected features and “−” the nonselected features for each classifier.
Target group for classification
Normal
PAD
L5
L4
Mean ankle angle
+
+
+
+
Knee angle at the start of the stance phase
−
−
−
+
Amplitude of the femur angle
+
−
−
−
Maximally relaxed muscle length of the gastrocnemius muscle from the reference model
−
+
+
+
Maximally contracted muscle length of the gastrocnemius muscle from the reference model
+
+
+
+
Range of motion of the gastrocnemius muscle from the reference model
+
−
−
−
Maximally relaxed muscle length of the quadriceps muscle from the reference model
+
−
−
−
Maximally contracted muscle length of the quadriceps muscle from the reference model
−
−
−
+
Range of motion of the quadriceps muscle from the reference model