![]() ![]() Double support – when both feet are touching the ground – with walking, there are two phases of double support, one at the beginning of the stance phase, and one at the end of the stance phase With running, toe off occurs before 50% of the gait cycle (40%), and double support does not occur - instead double float occurs, once at the beginning of swing and at the end of swing As speed increases, time spent in swing increases, stance time decreases, double float increases, and cycle time shortens.Toe off marks the beginning of the swing phase of the gait cycle - since the runner is moving faster, less time is spent in stance phase, and toe off occurs quicker The timing of toe off depends on speed. ![]() Stance ends when the foot is no longer in contact with the ground.These moments in time are referred to as initial contact. The gait cycle begins when one foot comes in contact with the ground and ends when the same foot contacts the ground again.Here is a review of some definitions as they apply to the running gait cycle: ĭuring the running gait cycle, the ground reaction force (GRF) at the centre of pressure (CoP) have been shown to increase to 250% of the body weight. At swing phase reversal, the next period of absorption begins. Īfter stance phase reversal, the center of mass is translated upward and forward during stance phase generation. After absorption, the velocity of the center of mass decelerates horizontally. The muscles and joints, must also be able to absorb increased amounts of energy to control the weight of the HAT.Īs seen, there is an absorption phase and a generation phase in the stance phase of running. The muscles must produce greater energy to elevate the head, arms and trunk (HAT) higher than in normal walking, and to support the HAT during the gait cycle. The amount of time that the runner spends in float, increases as the runner increases in speed. There is the addition of a double float phase, at the beginning and end of the swing phase during the running gait cycle, in which both feet are off the ground. There is a need for greater balance because the double support period, present during the stance phase of the walking gait cycle, is not present when running. ![]()
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