Research Publication Title

Comparing Dorsiflexion vs Plantar Flexion Jump Position on Vertical Jump Height Utilizing Just Jump System

Major

Exercise Science

Faculty Mentor

Dr. Mike Martino

Keywords

Vertical jump, Dorsiflexion, Plantar flexion, Just jump system, Landing

Abstract

The purpose of this study is to compare two different landing positions on predicted vertical jump height using a jump timing mat. The assessment of maximal vertical jump height is frequently tested in the sports performance industry. The results have been used to determine an athlete’s progress, level of athletic performance, and future potential. However, there are many different methods of calculating vertical jump which can result in conflicting values due to erroneous measurements. Timing mats like the Just Jump System have become popular due to their ease of use and instant results. The Just Jump System is an example of an electrical contact operated system. The Just Jump Mat is a large square mat with a hand-held computer unit. The mat calculates vertical jump height by measuring the time that the individual’s feet are not in contact with the mat and from this unit calculates jump height based on time in the air. Based on this format, when performing a vertical jump on a jump mat if one was to alter their foot position for landing it would increase their vertical jump artificially by increasing time in the air. In this study we will compare the jump height of participants when they alter their landing via dorsiflexion and plantar flexion of the ankle joint. After all data is collected, a paired sample T-test will be conducted to compare the group means. The Cohen’s D test will also be used to calculate an effect size.

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Comparing Dorsiflexion vs Plantar Flexion Jump Position on Vertical Jump Height Utilizing Just Jump System

The purpose of this study is to compare two different landing positions on predicted vertical jump height using a jump timing mat. The assessment of maximal vertical jump height is frequently tested in the sports performance industry. The results have been used to determine an athlete’s progress, level of athletic performance, and future potential. However, there are many different methods of calculating vertical jump which can result in conflicting values due to erroneous measurements. Timing mats like the Just Jump System have become popular due to their ease of use and instant results. The Just Jump System is an example of an electrical contact operated system. The Just Jump Mat is a large square mat with a hand-held computer unit. The mat calculates vertical jump height by measuring the time that the individual’s feet are not in contact with the mat and from this unit calculates jump height based on time in the air. Based on this format, when performing a vertical jump on a jump mat if one was to alter their foot position for landing it would increase their vertical jump artificially by increasing time in the air. In this study we will compare the jump height of participants when they alter their landing via dorsiflexion and plantar flexion of the ankle joint. After all data is collected, a paired sample T-test will be conducted to compare the group means. The Cohen’s D test will also be used to calculate an effect size.

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