INTRODUCTION: Ballet dancers are required to use the same technique on both sides of the body, though humans have each characteristic movement as seen in dominant foot manner. It is supposed that there are characteristics of movement control unique to ballet dancers. Although a difference between left and right ground reaction forces was observed in ballet students` landing of a grand jeté, a basic ballet jump (1), there have been few kinematic and kinematic studies between left and right professional ballet dancers` ones. The purpose of this study was to compare kinematics and kinetics of those left and right grand jeté landings performed by professional ballet dancers. METHODS: Fifteen female professional ballet dancers (age: 26.5±3.2 years, height: 160.5±3.8 cm, weight: 47.1±3.4 kg, their ballet experience: 22.1±3.4 years) were recruited to participate in this study. A questionnaire survey was circulated and replied before the experiment. Subjects were instructed to perform three times grand jeté plays for each leg at maximum effort, of which each highest jump in both legs was analyzed. Using the data obtained in the experiment, we calculated the jump height and maximum ground reaction force (Max Fz), the angle of flexion and extension of the three lower limb joints at Max Fz, the angle of external and internal hip rotation, the moment of flexion and extension of the three lower limb joints at Max Fz and the max moment of extension of each joint to evaluate the performance of the grand jeté. The time required from IC (initial ground contact) to Max Fz and IC to maximum extension moment of each joint were individually calculated. Unpaired t-test was performed using the above-calculated data assuming equal variances with a = 0.05 Variables of left and right legs were compared. RESULTS: The questionnaire showed that all subjects usually used the right grand jeté, and 86% of them, which indicated that they were good at the right grand jeté. However, t-tests for each analyzed item showed no statistically significant differences in the angles and moments of the three lower limb joints at Max Fz or the max moment of each joint at their landing in the left and right grand jeté. CONCLUSION: The results of this study have suggested that professional ballet dancers have more or less strong and weak points on their grand jeté plays depending on the dominant foot manner and also their total amount of practices. However, from viewpoints of kinematics and kinetics it was confirmed that the left and right grand jeté landings were coincident. This could be attributed to their daily training effect as professional ballet dancers of which enhancement may reduce bilateral difference.
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