kBox4 manual v9.5
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The kBox is a ‘multi-exercise flywheel device’. Which
muscle is being exercised depends on which exercise
is being performed.
The principle is that through muscle force you accelerate and
decelerate a flywheel (or flywheels). Exercises with high intensity and
high forces stimulate muscles to increase in size and the nervous
system to increase activation of the muscles. These effects together
increase strength over time if the exercise is repeated regularly.
Resistance
Principle of the kBox
Eccentric loading
The resistance is variable and unlimited.
The flywheel has a specified inertia and there is no upper limit to
how much kinetic energy you can produce in the flywheel motion.
You can think of the flywheel as a weight that weighs more if you
put more effort into lifting it. Resistance is variable so if you pull less,
the flywheel will resist less.
Every repetition in al set can be maximal instead of only the last
one, which is the case with traditional weights. This results in a
higher training efficiency, earlier onset of strength increase and
hypertrophy*.
The potentially higher exertion on the kBox may lead to a need for
longer resting periods between sessions to fully recover.
*) Hypertrophy refers to an increase in muscular size achieved
through exercise.
The kBox4 provides for increased eccentric workloads.
The skeletal muscles can produce more force in the eccentric, or
negative phase. This is difficult to take advantage of with traditional
weights, which always weigh the same.
If you accelerate the flywheel during the concentric, or lifting phase
and then decelerate in a shorter amount of time, you will have
to produce a higher eccentric force. This will be similar to lifting
weights that would normally be too heavy to lift, unless assisted
by a training partner, but executing the eccentric (lengthening)
phase by yourself. Check the training guide for more information on
eccentric overload.
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