Nyak Amir, Saifuddin
One of the most important aspects in the lawn tennis game is the service. Factors affecting service, besides the body's physical condition and position, are angle of movement and force. Good body position, right angle of movement and strong force will result in a good service. This study aimed to obtain data on body position, angle and force to exactness of service in lawn tennis. This research employed analytical descriptive analysis with four PELTI (Indonesian Lawn Tennis Association) athletes of Aceh province as the subject of the study. A videotape was used as the instrument for body positions, movie maker software and AutoCAD 2007 were used to record the angle, and axis accelerometer sensor and logger pro software were used to know the force. The results of the study showed that (1) overall, position of the body in a service based on the phase of body position movement of all athletes was good. 2) overall, for good results of lawn tennis service, the position of forefoot stand between 35 to 45 degrees to the baseline, the distance between the foot pivot parallel with shoulder, racket rotating movement backwards until your arms are straight and reach an angle of 90 degrees with the body, the position of the forearm that bring racket perpendicular to the field during the stretch, hip rotating, continued rotation of the upper body with your shoulders sideways towards the net, knees bent closer to 160-170 degrees, the angle between the upper arm with upright between 90-110 degrees when impact, good movement on the follow through stage on the technical services was forefoot landing. 3) good service force of lawn tennis was 6.335 kg and acceleration of 94.1 m / s2 so as to give rise to force of 696.16 N. © 2018, Editura Universitatii din Pitesti. All rights reserved.
Department of Physical Education, Faculty of Teacher Training and Education, University of Syiah Kuala, Indonesia
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