When does the pre-swing phase occur in gait analysis?

The pre-swing phase in gait analysis occurs at heel-off. This phase marks the transition between the stance and swing phases of walking. Specifically, pre-swing is the period right after the heel of one foot leaves the ground but before the other foot makes contact. It is characterized by the rapid unloading of the weight from the limb that is taking off, which prepares it to switch into the swing phase.

During pre-swing, significant mechanical events take place that are critical for efficient ambulation. The knee begins to flex, allowing the leg to move forward while the foot is still in the air. The positioning of the body is crucial at this point, as it shifts to facilitate forward movement. Understanding the timing and mechanics involved in this phase is essential for anyone involved in gait analysis and rehabilitation, particularly when assessing for conditions that may affect the gait cycle.

The other options represent different phases of the gait cycle. For instance, toe-off occurs at the end of the pre-swing phase when the toes become fully airborne, mid-stance is when the body weight is fully on one leg, and initial swing begins the motion of the leg moving forward after toe-off. Each of these phases has distinct roles and timings within the overall gait cycle, but