การเปรียบเทียบโปรแกรมการฝึกพลัยโอเมตริกบนพื้นทรายและพื้นแน่นที่มีต่อความสามารถในการกระโดดในแนวดิ่งของนักกีฬา / ลดารัตน์ มะลิหวล = A COMPARISON OF PLYOMETRIC TRAINING PROGRAM BETWEEN SAND AND FIRM SURFACES IN VERTICAL JUMP PERFORMANCE OF ATHLETES / Ladarat Malihuan
Purpose: The purpose of this research was to study and compare of plyometric training program between sand and firm surface in vertical jump performance of athletes. Method: Twenty four male of volleyball players from Faculty of Physical Education Srinakarinwirot University were purposively sampled for this study. They were divided into two groups (12 persons per group) based on matching group method.The first experimental group performed plyometric training program on sand.The second performed plyometric training program on firm surfaces. Training was eight weeks and experimental subjects trained twice a week. Before and after training measures included : leg muscular power,velocity and force of vertical jump.The obtained data were analyzed in terms of means,standard deviation,Paired t-test and Independent t-test with the significant level of 0.05 Results: Velocity of vertical jump in plyometric training program on the firm surfaces was significant greater than before training at the .05 level. Velocity of vertical jump in plyometric training program on the sand was significant greater than before training at the .05 level. Force of vertical jump in plyometric training program on the sand was significant greater than before training at the .05 level. Conclusions: Plyometric training program on the sand provided the same performance enhancement benefits as plyometric training program on the firm surfaces