تحليل النشاط الكهربي للعضلات و بعض المتغيرات البيوميكانيكية لأداء مهارة النطر بالسحب للاعبي هوكي الميدان

Abstract EN

The research aims at identifying the relationship between the extent of the contribution of the muscle electrical activity and some biomechanical variables with the velocity of shooting the ball for the drag flip technique in field hockey.

The sample included 4 top level hockey players (age 20.50 ± 1.12 years, mass 81 ± 3.86 kg, height 179.25 ± 3.50 cm).

The players perform three attempts of the drag flip at a distance of 14.16 meters.

The data was collected by using the Finnish made device, MegaWin 6000 to measure the percentage of electrical activity, Bertec 4060-10 (1000Hz) to measure the variables of pushing the ground by the players’ back foot, two-dimensional imaging using a 100 cadres / sec.

camera.

The biomechanical analysis was conducted using the VideoPoint 2.5 motion analysis.

The results showed that the muscles (gluteal, gastrocnemius, frontal dorsal, large pectoral, latissimus dorsi) are the most contributing to the velocity of shooting the ball, and that the longer the distance between the feet with the low body mass center, that led to increasing the pushing of the legs to generate high strength to increase the velocity of the racket, also the increase of the body brake at the moment of shooting the ball while reducing the angle of the racket increases the velocity of the racket and thus the velocity of the ball.