Biodex: Measuring Strength

There are a number of different methods to measuring strength. Including, strength tests, for example, bench press, squat and deadlift. However, to gain a precise amount of force production through a muscle contraction, a type of dynamometer must be used. The Biodex has shown to be reliable and accurate throughout numerous amounts of studies. To test force production, the main method is through an isokinetic test. One of the most reliable and advanced systems is the Biodex isokinetic system. Asundi, Tsiros, Grimshaw, Shield and Buckley (2011) conducted a study to determine the limitations and advantages of using a Biodex to determine quadriceps strength. 200 participants were used to measure quadricep strength, with a resistance of 60 degrees per second. The researchers used identical Biodex devices in two separate laboratories. In result, the Biodex is considered a reliable and overall safe isokinetic dynamometry. However, there are some limitations with the hardware of the Biodex system because there is no available way to secure the non-testing leg.
With the use of a Biodex dynamometer, Cress, Peters, and Chandler (1992) investigated the force-velocity relationship during eccentric contraction. Thirty female athletes from Duke University volunteered to participate. The participants performed maximum voluntary concentric and eccentric contractions of the right quadriceps muscle group at test velocities of a resistance of 30, 60, 90, 120, 150, 180, and 210 degrees per second. In conclusion, the concentric data indicated that there was a decrease in force as velocity increased. Also, there was no change in eccentric force as velocity increased. In conclusion, the Biodex dynamometer proved to be a reliable tool for measuring the force-velocity relationship during eccentric