Effects of 6-week Depth Jump and Drop Jump Training on Isokinetic Strength and Agility Performance

Purpose: The purpose of this study is to find out the effect and characteristics of training according to the technical differences of drop jump by examining the effect of 6 weeks of depth jump & drop jump training on the isokinetic strength and agility performance.BR Method: Nineteen collegiate Students participated in the present study and were randomly assigned to 6 weeks of depth jump (DEJ) or drop jump (DRJ) training twice a week. Data on the measured variables (isokinetic strength of knee flexion and extension, the height of a vertical jump, and agility test) were collected before and after a 6-week training period. A 2×2 analysis variance (two factors mixed-effects ANOVA) was used for the statical analyses. The significant level of hypothesis verification is set-up as α=.05.BR Results: The results of this study are as follows. 1) The 6 weeks of depth jump training significantly improved isokinetic strength & average power (60°/sec, 180°/sec, and 300°/sec speed condition), vertical jump performance, and agility (p.05). 2). The 6-week drop jump training significantly improved agility (p.05), but the isokinetic strength, average power, and vertical jump performance did not indicate significant improvement. 3) There were no significant differences between depth jump (DEJ) & drop jump(DRJ) training on the measured variables (isokinetic strength of knee flexion & extension, the height of vertical jump, and agility test) after 6 weeks of training (p.05).BR Conclusion: It is supported that depth jump (DEJ) and drop jump (DRJ) training is an optional and useful method that can be used to increase isokinetic strength, power, and agility in the final preparation phase of athletes before the competition season.