Figure 1
Typical biomechanical traces in the Control condition and the GI-high condition (gait initiation with a high level of cervical spine mobility restriction). Traces reported in each condition are obtained from the same participant performing one single trial. Anteroposterior (AP) direction. x’MTO, x’MFC: centre-of-mass (COM) velocity at toe-off and foot-contact. xPmax: peak of backward centre-of-pressure (COP) shift during APA. F forward; B backward. Mediolateral (ML) direction. y’MTO, y’MFC: COM velocity at toe-off and foot-contact. yPmax: peak of ML COP shift during APA. ST: stance limb; SW: swing limb. Vertical direction. z’Mmin, z’MFC: peak of negative vertical COM velocity and COM velocity at foot-contact. D downward; U upward. Vertical dashed lines: t0 onset variation of biomechanical traces; HO swing heel-off; TO swing toe-off, FC swing foot-contact. Horizontal arrows: QS quiet standing, APA anticipatory postural adjustments; FL: swing foot-lift; EXE execution phase of gait initiation.
