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. 2019 Jun 3;99(6):739–747. doi: 10.1093/ptj/pzz040

Figure 3.

Figure 3.

Gait-phase detection for the right side (ipsilateral) using left and right shank angular velocity around the mediolateral axis for a representative child who is typically developing. The onsets of 4 gait phases—loading response (LR), initial swing (ISw), midswing (MSw), and terminal swing (TSw)—are defined by peaks and zero-crossings of ipsilateral shank angular velocity: LR is defined by initial contact (IC)—also called heel strike (HS) in typical gait—and is detected as a positive-to-negative zero crossing; ISw is defined by toe-off (TO), detected as the last prominent peak in stance following IC/HS; MSw is detected as a negative-to-positive zero crossing; and TSw is detected as the absolute minimum in the gait cycle. The onsets of the remaining gait phases—midstance (MSt), terminal stance (TSt), and preswing (PSw)—are defined by contralateral gait events: MSt is defined by contralateral ISw onset; TSt is defined by contralateral TSw onset; and PSw is defined by contralateral IC/HS.