Both movements were comprised of four components: initial step, lowering, rising, and return step. For the anterior lunge the initial step began with flexion of the left hip, while during the posterior lunge the initial step began with extension of the right hip. Both ended with the foot contacting the floor. The initial step took 1.089 seconds for the anterior lunge (30.84% of the total movement time), compared to 1.155 seconds (33.33% of the total movement time) for the posterior lunge. For the anterior lunge lowering began with the left foot fully contacting the floor, while during the posterior lunge lowering began with the right foot contacting the floor. Both ended when the knee was almost in contact with the floor. Lowering took 0.858 seconds (24.30% of the total movement time) for the anterior lunge, compared to 0.72 seconds (20.95% of the total movement time) for the posterior lunge. For the anterior lunge rising began when the right knee was almost in contact with the floor, while in the posterior lunge rising began with the right knee almost contacting the floor. Both ended when the foot lost contact with the floor. Rising took 0.693 seconds (19.63% of the total movement time) for the anterior lunge, compared to 0.693 seconds (20.00% of the total movement time) for the posterior lunge. For the anterior lunge, the return step began when the left foot lost contact with the floor, while in the posterior lunge the return step began when the right foot lost contact with the floor. Both ended when the subject returned to upright standing. The return step took 0.891 seconds (25.23% of the total movement time) for the anterior lunge, compared to 0.891 seconds (25.71% of the total movement time) for the posterior lunge. The total movement time for the anterior lunge was 3.531 seconds, compared to 3.465 seconds for the posterior lunge.
The anterior lunge began with the subject standing fully upright. The subject stepped forward with the left leg and flexed the left knee, until the right knee almost touched the ground. The subject then extended both the left and the right knees and the left hip, returning to upright standing. For the posterior lunge, the subject stepped backward with the right leg, until the right foot made contact with the floor and the right knee almost touched the floor. The subject then began to rise and flex the right hip, returning to upright standing.
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Figure 2. Body motion in the anterior lunge (left) and the posterior lunge (right). The body segments present in the stick figures (from top to bottom) are the trunk, thigh, lower leg, and foot of the left side of the body. The arrows in the figures above show the direction of motion of the body in the sagittal plane. The reference markers were placed 1.87m apart from each other in the sagittal plane. The camera was perpendicular to the sagittal plane. | |
