The principal component output for the gluteus maximus is shown as an example in Figure
1. The positive variance direction is shown for all PCs (which, in this example, represents
the CP group for PCs 1, 2, and 4, and the TD group for PC 3). The group not shown for each
PC (TD for 1, 2, 4 and CP for 3) demonstrates equal variance in the opposite direction.
When combined, the major regions of variance identified (the 4 PCs) encompass the entire
gait cycle, with the CP group demonstrating variance in the direction of higher mean
frequency for each PC. This pattern of the 4 PCs encompassing the entire gait cycle was
consistent for each muscle.