Final answer:
Heel off occurs at about 60% of the gait cycle, marking the transition from the stance phase to the swing phase.
Step-by-step explanation:
Heel off, also known as the heel rise, occurs during the gait cycle, which is a repeating pattern that involves the phases of walking or running. Heel off typically occurs at around 60% of the gait cycle. This is the moment when the heel lifts off the ground as the foot prepares to propel the body forward. The gait cycle is divided into two main phases: the stance phase, where the foot is in contact with the ground, and the swing phase, where the foot moves through the air.
Heel off marks the end of the stance phase and the beginning of the transition to the swing phase of the gait. Specifically, it is part of the terminal stance phase that occurs just before toe-off, which is when the toes leave the ground.