The MyPhysio High Performance Centre is the first and only clinic in Australia to have the kBox from Exxentric. It is used by our many National champion athletes and “Sports Stars” here and around the world including Cricket Australia and Baltimore Orioles.
The kBox, or kinetic Box, is a flywheel exercise device. The principle with a flywheel device is that, through muscle force, you accelerate or decelerate a flywheel (or flywheels). The force needed to manipulate the speed in the flywheel, depends on the inertia of the flywheel, not on the weight.
This is different to traditional weights which rely on repeated muscle contractions (concentric and eccentric), usually lifting a heavy weight against gravity which means the effect is limited by the fact that only the athlete’s last effort is maximal.
The resistance is variable and unlimited. There is no upper limit in how much kinetic energy you can produce in the flywheel motion. This means that you can always use a higher force and accelerate the flywheel more. It is also suitable for rehabilitation in that if you pull less the flywheel will resist less.
With traditional weights only the last repetition is maximal, if you continue until failure then all reps prior to that are submaximal. However, with flywheel devices, if you go maximal then every repetition is maximal, with a higher force and power output early in the set and lower in the end (see diagram). A maximal set with a flywheel device is actually a maximal drop set. This is how flywheel training gives an increased hypertrophic response earlier in the training regimen compared to traditional weights.
Eccentric overload training is regarded as the most effective way to gain strength fast. After reviewing the kBox, Olympic Athletics coach Carl Valle stated it produced “the fastest drug free changes I have seen on paper”! Without risk of injury, training partners or large volumes of weights the kBox can produce eccentric overload training volumes simply by the athlete decelerating the flywheel in a shorter time span than the concentric phase. Ie. Ask the athlete to count 3 on the way up and 2 on the way down.
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