Zero Tension Mouse - created by Active Release
Technique Founder Dr. Michael Leahy
Biomechanics, Zero Tension Mouse™, and Cumulative Injury
- A few years ago Dr. Michael Leahy defined the cumulative injury
cycle and explained why soft tissues like nerves and muscles became
injured with repetitive motion. Until this time the standard treatments
were ultrasound, electrical stimulation, massage and nerve and muscle
stretching. In general the problem was not resolved. Then came Active Release Techniques® and all of a sudden surgeries
were no longer needed and in general the problems were fixed in
short order. Dr. Leahy then worked on how to prevent repetitive
motion injuries from happening. He formulated the law of repetitive
motion and defined the four factors involved in these injuries.
The one factor that could be minimized was tension on the tissues
or "relaxation" of the muscles. If the muscles could be relaxed
during the activity but still maintain function then the problem
could be avoided and the employer would still be happy with production.
With the Zero Tension Mouse™ all of the muscles of the hand,
arm and shoulder/neck can relax and do so more effectively than
with any other device in the world. In fact, nothing else comes
close.
Let's start with the hand. When the hand is completely
relaxed the fingers flex and the hand is half way between a fist
and completely straight. This balances the tension between the flexors
and extensors of the fingers. When the flexors are tight they can
trap the median nerve and cause what is commonly but erroneously
called "carpal tunnel syndrome." When the extensors are too tight
they can cause epicondylitis or "tennis elbow." They can even trap
the radial nerve and cause numbness in the hand. In order to prevent
this the hand must be positioned so that it is not too straight
and not closed too tight.
The Zero Tension Mouse exactly balances the flexors and extensors so that they
can relax. A regular mouse causes the extensors to tighten in order
to hold the fingers slightly above the mouse buttons. They are under
slight tension all the time which causes the cumulative injury effect.
Next
the wrist. With a regular mouse the wrist is usually extended slightly.
This is not a major problem but the tension on the wrist extensors
to maintain this position is definitely a problem. The Zero Tension
Mouse eliminates this problem by placing the wrist in neutral between
flexion and extension. It also places the wrist upright instead
of flat so that the wrist extensors can relax instead of tightening
to maintain position.
The wrist is upright instead of flat in order to balance the pronators and supinator. These muscles turn the palm up and down and in a regular mouse they twist the wrist palm down so that all three muscles are tight. Over time this becomes a significant problem causing that all too familiar syndrome called "carpal tunnel."
The thumb becomes a problem with mouse devices that require the thumb to be
in position over a ball or multiple position switch that goes back
and forth. These cause the muscles that extend or move the thumb
sideways to tighten. These muscles don't tolerate this for very
long and quickly become painful. The Zero Tension Mouse avoids this
by giving it a special place to rest and relax. When scrolling a
page, if desired, you can move the thumb onto the scroll wheel and
move it up and down then rest the thumb next to the scroll wheel
when done.
Probably
the most important feature of the Zero Tension Mouse is it's ability
to relax the shoulder and neck. With a regular mouse the weight
of the arm and shoulder is supported by the trapezius and levator
scapulae muscles. The scalenes also tighten as the shoulder is supported.
This is because you cannot rest the weight of the arm and shoulder
on the mouse while using it. Almost everyone has felt that "burning"
in the muscles between the neck and shoulder after using a regular
mouse for any length of time. This causes damage to the tissues
that builds up over time.
The Zero Tension Mouse allows you to rest the arm and shoulder
on the cradle for the hand. If you keep the mouse relatively close
to the body the entire arm, shoulder and neck will relax. Most people
feel an instant relief when switching to the Zero Tension Mouse. Repetitive motion injuries in the US alone account for as much as $100 billion
in medical costs and lost productivity. The aim of the Zero Tension
Mouse is to reduce that number, but more importantly, our aim is
to enable you to work without the pain and disability of these injuries.
**QFAC no longer carries this product
- please accept our apology for any inconvenience this may have
caused. Please check out our other fine products currently available
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