关键词: VR技术, 短道速滑, 出弯道技战术, 武大靖

Abstract: Wu Dajing, a leading short track speed skater in China, won the gold medal in men's 500 m at the 2018 Pyeongchang Winter Olympic Games. We hope that Wu Dajing will make another outstanding achievement in the coming Beijing Winter Olympic Games. The technique of skating out of the curve plays an important role in technique and tactics, and it is also critical for athletes to obtain excellent results. This paper shooted men's 500 m final of the 2017/18 ISU World Cup Short Track (Shanghai) through three-dimensional video, analyzed the kinematic parameters of Wu Dajing's technique of skating out of the curve, reconstructed his technique of skating out of the curve through 3D virtual reality technology, and explored the kinematic characteristics of world's elite short track speed skaters' technique and tactics in skating out of the curve. The results show that: (1) The skating track of Wu Dajing gradually deviates from the track (4.59 m) and the speed is 13.13 m/s at T5, which can maintain his skating speed while reducing his skating distance as much as possible. (2)The internal inclination angle of Wu Dajing gradually increases, which can avoid falling and slow down the decline of speed as much as possible. (3)Wu Dajing's torso angle is smaller when his right foot is off the ice (T2) or when his left foot is off the ice (T4), and the trunk angle is smaller when his right foot is on the ice (T3) or when his left foot is on the ice (T5), that is, Wu Dajing's posture is lower in the single-foot supporting stage and higher in the double-foot supporting stage. (4)Wu Dajing's extension of the right leg in the first double-foot supporting stage is smaller than that of the left leg in the second double-foot supporting stage. (5)Wu Dajing's ice pedalling angle of the left leg is always smaller than that of the right leg, and the change range of the ice pedalling angle of the left leg is smaller than that of the right leg. (6)The gravitatinal center of Wu Dajing gradually increases in the process of skating out of the curve; the average speed in the four stages is maintained well; the time of the double-foot supporting stages is shorter than that of the single-foot supporting stages. In summary, Wu Dajing has good technical and tactical ability to skate out of the curve, and it is worth study. It is suggested that he keep the torso angle as small as possible without destroying the movement structure and the rhythm of competition, which is helpful to reduce the air resistance and maintain high-speed skating. In addition, it is necessary to appropriately reduce the ice-pedalling angle when the right foot is off the ice (T2), which is conducive to enhancing the pedaling effect.

Key words: virtual reality technology, short track speed skating, skating out of the curve, Wu Dajing