RESULTS

 

Temporal Analysis

The maximal vertical jump began in an upright position. The three phases of the movement consisted of take-off, flight, and landing. The take-off phase began in the standing position and ended once the feet lost contact with the floor. The flight phase began once the feet lost contact with the floor until the feet regained contact with the floor. The landing phase began once the feet regained contact with the floor until the subject returned to standing position. The end of the movement is the return to upright position. The total time for the basketball player and the ballet dancer were 2.61s and 2.74s, respectively. This phase lasted for 44% (1.16s) of the total time for the basketball player and 41% (1.12s) for the ballet dancer. The flight phase occurred when the subject was in the air and lasted 18% (.46s) for the basketball player and 14% (.37s) for the ballet dancer. The landing phase took place when the subject returned to the floor. This phase lasted for 38% (.99s) for the basketball player and 45% (1.221s) for the ballet dancer.

 

Qualitative Analysis

Subjects began the maximal vertical jump from a standing position. In the take-off phase, the subjects began flexion of the knees and hips. In the flight stage, both subjects reached maximal extension of knees and hips. During the landing phase, both subjects' knees and hips returned to a flexed state and then to an upright vertical position.

Figure 2. Body motion in the maximal vertical jump of the basketball player (left) and the ballet dancer (right). Body segments shown are the trunk, thigh, shank, and foot. The direction of motion is from bottom to top. The black squares represent reference markers.