How To Measure Vertical Jumps
The simplest method to measure an athlete's vertical jump is to get the athlete to reach up against a flat wall, with a flat surface under his/her feet (such as a gym floor or concrete) and mark off the highest point he/she can reach flat-footed (this is referred to as "standing reach"). Then, instruct the athlete to take several jumps from a standstill, marking off the highest point he/she can reach. Next, measure the distance between the two. This is the athlete's standing vertical jump and this can be monitored to track any increases in vertical jump.
The method described above is the most common and simplest way to measure one's vertical jump, but other more scientifically accurate methods have been devised. A pressure pad can be used to measure the time it takes for an athlete to complete a jump, and then using a kinematics equation (h = g*t2/8), the computer can calculate his/her vertical jump based on the time in the air.
A second, more efficient and correct method is to use an infrared laser placed at ground level. When an athlete jumps and breaks the plane of the laser with his/her hand, the height at which this occurs is measured.
Devices based on United States Patent 5031903, "A vertical jump testing device comprising a plurality of vertically arranged measuring elements each pivotally mounted..." are also common. These devices are used at the highest levels of collegiate and professional performance testing. They are composed of several (roughly 70) 14-inch prongs placed 0.5 inches apart vertically. An athlete will then leap vertically (no running start or step) and make contact with the retractable prongs to mark their leaping ability. This device is used each year at the NFL scouting combine.
Read more about this topic: Vertical Jump
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