Issn Print: 0195-9131
Publication Date: 2001/05/01
GROUND REACTION FORCE CHARACTERISTICS OF A DROP-JUMP PERFORMED BAREFOOT AND WITH SHOES
M N. Reid; J A. Mercer; J S. Dufek; B C. Mangus
+ Author Information
Author Information: Department of Kinesiology, University of Nevada, Las Vegas
Excerpt
The effect of drop-jump training on ground reaction forces (GRF) has been a topic of interest in the athletic field. A drop-jump is a task in which a performer drops from a platform of specified height and immediately jumps for maximum height. It is common for athletes to perform drop-jumps with shoes on during a training program. However, during laboratory testing often subjects complete drop-jumps barefoot. The purpose of this study was to investigate GRF during drop-jumps while barefoot and while wearing running shoes. Five female students (age: 24 ± 2.6 yr; mass: 62 ± 4.3kg, height; 1.69 ± 0.06 m) performed 10 drop-jumps each for maximum height from a 30cm platform for two conditions: barefoot and while wearing standard running shoes. All subjects completed at least one training day prior to testing in order to practice the drop-jump without the use of arms. Order of conditions was counterbalanced and ample rest was allowed between trials. GRF were recorded (1000Hz) by having subjects perform the drop-jumps on a Kistler force platform. Contact time (CT), average vertical force (FAVG), and maximum vertical force (FMAX) were analyzed by calculating the mean of ten trials per condition per subject. Comparisons were made between conditions using paired t-tests. It was determined that there was no difference in jump height between conditions (p>0.05). Additionally, FAVG, FMAX and CT were not different between barefoot and with shoe conditions (Table 1; p>0.05). The lack of difference in FAVG, FMAX, and CT between conditions may have been a result of subjects accommodating their strategy during barefoot drop-jumps relative to drop-jumps with shoes.
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