Abstract:
The purpose of this study was to analyze the somersault smash skill in two-dimension of kinematic variables. The subjects were four sepaktakraw players of Ubonrachatani Sports School who played in the offensive position with high performance of high school level. Each subject performed the somersault smash skill for three times, each time was recorded by the 2 VHS video cameras with 50 Hz from the side (sagittal view) and the front (frontal view). Angles of the following joints : left and right ankle, left and right knee, left and right hip and left and right shoulder at the position of taking off, ball impact, and landing phase together with the velocities of right foot at taking off, ball impact, and landing phase were anslyzed in term of Means and Standard deviation. The results of this study were found as following: 1. Angles of various joints in the different movement phases showed that 1.1 At take off position, angles of right and left ankle, right and left knee, right and left ankle, right and left knee, right and left hip and right and left shoulder were between 47.89-82.11, 113.88-138.36, 126.00-148.77, 69.71-88.23, 43.00-56.72, 97.97-170.73, 123.76-148.87 and 96.75-137.85 degrees, respectively. 1.2 At ball impact position, angles of right and left ankle, right and left knee, right and left hip and right and left shoulder were between 160.53-175.60, 98.91-160.32, 175.10-179.89, 107.10-178.56, 116.94-127.54, 150.38-159.48, 33.98-112.85 and 20.86-15.00 degrees, respectively. 1.3 at landing position, angles of right and left ankle, right and left knee, right and left hip and right and left shoulder were between 47.89-82.11, 113.88-138.36, 126.00-148.77, 69.71-88.23, 43.00-56.72, 97.97-170.73, 123.76-148.87 and 96.75-137.85 degrees, respectively. 2. Means average of right foot velocities showed that 2.1 Means average at taking off phase of 1, 2, 3 and 4 subjects were 3.13, 3.71, 2.94 and 2.86 metre/second, respectively. 2.2 Means average at ball impact phase of 1, 2, 3 and 4 subjects were 9.70, 8.91, 9.73and 7.28 metre/second, respectively. 2.3 Means average of peak velocity of 1, 2, 3 and 4 subjects were 12.24, 11.85, 12.59 and 12.59 metre/second, respectively. 2.4 Means average average at taking off phase until ball impact phase of 1, 2, 3 and 4 subjects were 7.63, 7.93, 8.20 and 7.82 metre/second, respectively