THE CONTRIBUTION OF BAR TWIST EXERCISES ANDTRAINING ON SIGNAL ACOUSTIC UPPER SERVICE ABILITY IN SEPAK TAKRAW ATHLETES IN NORTH SUMATRA. ISJ [Internet]. 2020 Nov. 16 [cited 2026 Mar. 23];3(2):76-83. Available from: https://jurnal.unimed.ac.id/2012/index.php/isj/article/view/37826