Why it Hurts
How Far Do You Have to Go?
- 10,000 mouse clicks a day is 2,000,000, TWO MILLION a year.
- Based on a 222 working days (44 weeks) (excluding keyboards clicks)
Why Computer Related RSI?
- Say you move your mouse just 2 inches between each click.
- That is 4,000,000 inches or 333,333 feet, some 63.13 miles a year
- In metric units that is 101 Kilometers a year.
- You walk on your hands for over a mile, nearly 2 kilometers, per week!
- Doesn't using you larger upper arms muscles make more sense now?
Computer Urban Legend #1: - Wrist Rests
- Mechanical typewriters were thought not to inflict RSI so much
- The mechanical mechanism meant a wait each time a key was hit
- Though small, a Nano-Break, finger muscles got a rest each time
- Hands and arms were moved not held flat, promoting circulation
- The Computer mouse had not been invented!
Computer Urban Legend #2: -Trackballs (or any mouse you grip)
- (Mechanical) Typists did not rest their wrists on hard surfaces
- The weight of hands and forearms not pressing on the carpal tunnel
- Blood vessels at the wrist are closest to the surface
- Wrist rests, gel or otherwise, act as a partial tourniquet for the wrist
- They cause the circulation to be physically constricted even more.
- Do not use them we say and also say
- The American Association of Orthopaedic Surgeons
- Trackballs require finger activity with no arm movement at all
- Manipulation of the trackball applies a static load on fingers and thumb
- 1oz of force at thumb tip produces 10 oz on the thumb / palm joint
- 10 oz of force a second for a total of 3 hours a day, equals 6,750 lbs
- 3.38 tons of grip per day or 750+ tons in a 222 working day year
- We are capable of remarkable things, but not indefinitely.
For this page in more depth, click here or find out What to Expect