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Shlomi Gerbi

Shlomi Gerbi
Master i idrettsvitenskap
Fakultet for helse- og idrettsvitenskap
13. desember 2017

Reliability and validity testing of force-velocity profiling

In this study, we researched the equipment we use in the test laboratories at University of Agder, looking at co-variation, reproducibility, validity and sensitivity of the equipment. To do that, we had twelve athletes from different kinds of sports, testing the equipment. We conducted a jump test, squat test, 30m run test and a leg press test. The athletes conducted the test two times, with a week between test 1 and test 2. We can then see how reliable the equipments we use at University of Agder are. 

The muscles have two characteristics. One is the ability to generate power and two is the ability to contract. Thus, we can characterize an isolated muscle by measuring maximum force and maximum contract rate. If we multiple the product of power (N) and shortening speed (m / s), we get the product of work (J / s; W). The ability to perform work in the shortest possible time is central to many sport athletes in their competitions. For example, moving the body mass from A to B, like during a sprint, acceleration to the ball in a football match, or a dunk in basketball.

What the individual practitioner should prioritize in the workout can be individual. Some are naturally strong, but relatively slow, and others are relatively weak, but fast. In order to detect each athlete, we can carry out a force-velocity profile of the athlete. To carry out a force velocity profile of the athlete, we can use several different equipment’s, such as the Quantum 1080, 1080 sprint, encoder or a Keiser Leg press, as we have in the test laboratories at University of Agder, and using in collaboration with the south department of Olympiatoppen.

In the study, we researched the equipment we use in the test laboratories at University of Agder, looking at co-variation, reproducibility, validity and sensitivity of the equipment. To do that, we had twelve athletes from different kinds of sports, testing the equipment. We conducted a jump test, squat test, 30m run test and a leg press test. The athletes conducted the test two times, with a week between test 1 and test 2. We can then see how reliable the equipments we use at University of Agder are. 

We are two students (Shlomi and Kolbjørn) who study for a master’s degree in sport science at University of Agder. We got the opportunity to assist in this project on reliability and validity testing of the strength equipment at University of Agder, leaded by PhD research fellow Thomas Bjørnsen.

Our main responsibility was to test every athlete, and report in the results of each test. In the learning process, we got the opportunity to learn how to handle a DXA scan, Quantum 1080, Quantum sprint, Encoder and a Keiser Leg press. Everything relevant for measuring the strength and power of an athlete. It was a very educational process, thanks for the opportunity and the trust in letting us test the athletes and use the equipment.