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Typical heel dynamics at heel strike (HS), slip start (SS) and peak sliding speed (PSS) from an unexpected liquid-contaminated exposure: (A) sliding speed and VGRF, (B) shoe-floor angle and side-slip angle, and (C) COP. HS occurs at time = 0. SS was defined as the first local minimum after HS in the sliding speed. PSS was defined as the first local maximum in the sliding speed.
