Tag: Ergonomics

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Ergonomics RSI Tips

RSI – What to do? (Part 1 – RSI Initial Symptoms)

It can be a very confusing time for a computer user when they first experience RSI symptoms. The symptoms can often develop after a protracted period of intensified work, which may be ongoing. Initial injury symptoms can be very mild and will more than likely be ignored by the worker who will continue to work through them. This may be because the worker feels that the symptoms are very slight, and are manageable, or they may simply be confused about what those symptoms are. At this stage it is highly likely that the worker will not consult anyone about their symptoms eg an ergonomist, a company doctor, GP etc, and will more often than not want to avoid exposing their problem (however small) to their employer.

The danger with this is that, if symptoms are left unchecked, it can lead to their rapid worsening and the long march to a more debilitating (and difficult to treat) condition.

This need not be the case. There is a lot you can do at this early stage of RSI symptoms to help yourself.

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Ergonomics Input Devices Miscellaneous RSI Tips

How ‘Clicked Off’ Are You About Your Mouse? – mouse clicking alternatives and RSI

The act of a human clicking a mouse to control a computer has been around since the inception of window based GUI (Graphical User Interface) systems. Before GUI based systems were around, keyboards were the prominent way of user interaction with a computer. Mouse based systems were a leap forward in terms of computer usability, and have allowed a multitude of different graphical applications to be built around them.

The biggest problem with the invention of the mouse, and for that matter all current GUI based computer systems, is that they force a user to do a very repetitive motion that had up until their invention not been done before, ie the repetitive small movement of the index fingers to send a ‘click’ to the computer to say ‘do this’. Sometimes this repetitive task can be very intensive (depending on the application being used). This has over the last 15 years or so led to a large increase in cases of Repetitive Strain Injuries (RSI).

So what alternatives to standard mouse ‘clicking’ exist right now for the computer user? (Note: the following is by no means an exhaustive list)

  • keyboard short cuts
  • voice recognition software
  • foot pedal clicking
  • graphics tablet/tablet PC pen “taps”
  • software generated clicks
  • touch screen monitors

Each of the above have their own set of positive as well as negative points. The following is a brief summary

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Ergonomics RSI Tips

Keyboard Thumping and RSI

One vivid memory of my injury when employed was watching how fellow workers in certain situations thumped their keyboards. I remember it well, because I used to wince when I saw them do it.

Having been an RSI sufferer for the best part of a decade, and having come from an identical background to my colleagues (and no doubt had been prone to thumping keyboards in my time), I fully realised the implications of the use of excessive force as people interacted with their keyboards.

Keyboard thumping (the act of hitting the keyboard keys with exaggerated force or heavy pounding) can be barely noticed by the user, but is usually attributable to them being overly frustrated with the computer/piece of software being used or or emotionally involved with an angry ‘flame’ mail etc. During these times it is not unusual for this anger and stress to build up and be vented in this way. There is really no place for emotional frustration and computer use. Your body needs to be ergonomically positioned, relaxed and fluid when interacting with computers in order to minimise the exposure to RSI causing effects, and not demonstrating emotional reactions like the guy below!


The keyboard/computer is ‘paying the price’ for the person’s anger and frustration.

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Ergonomics RSI Tips

Lateral wrist deviation angle and RSI

Lateral (Ulnar) wrist deviation

A very common bad ergonomic practice is wrist deviation when using a keyboard. Keyboards have never been the most ergonomically designed devices, and users tend to hold their wrists very central to the keyboard whilst inducing a lateral deviation in their wrist angle.

bad wrist angle keyboard RSILateral (ulnar) deviation can eventually lead to wrist pain, both centrally and at the outer edges of the wrist. This can occur due to nerve pinching and tendon compression which can ultimately lead to RSI like conditions.

The image on the left shows lateral deviation in both wrists. This deviation can be further worsened by the user reaching for keys at the more extreme end of the keyboard, most commonly by little lateral wrist ‘flicks’.

This is a very common ergonomic problem, and can be easily rectified by the user once they know what to look for. The biggest problem being that most
users don’t start paying attention to wrist deviation this until pain develops.

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Ergonomics RSI Tips

Typing with Clawed Hands

With any computer input device, it’s how you use it that is important.

The prevalence is for keyboard users to use ‘clawed’ hands when using a keyboard to enter text. By this I mean when a user readies their hand position over the keyboard before they type, or whilst in thought between text entries, the hands can be seen to be extended into the air from the wrist in a ‘claw’ like shape (as pictured below). Often the wrists are leaning on a wrist rest, or worse still, leaning on just the hard desk surface .

bad wrist angle - the 'claw'

Even worse, some users can actually continue typing with their hands in this claw like manner, with the fingers being held high over the keys like an eagle’s talons over it’s prey.

The risks involved in this practice can be significant when done over a continuous period of time. The forearm extensor muscles are in continuous tension, as well as the tendons over the back of the hands and fingers. If held tense like this for long periods, the forearm muscles can fatigue very easily, ie they are being used in a way that they were not designed to be used for over protracted periods.

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Ergonomics RSI

Looking Back

RSI has been part of my life for over ten years now. In many ways I can’t remember the pain free time before the condition started. It’s hard to remember how it felt to use a computer and not associate its use with pain. I have in the past often been asked, ‘Why is this happening to you when others doing similar jobs don’t have any symptoms?’ Well, I guess we are all individuals, with unique musculo-skeletal structures, sensitivities and vulnerabilities, and therefore we all will react to using computers in different ways. We also have our individual ergonomic foibles, no two of us are the same, and we all misuse computers in a slightly different way from each other. As such, we can experience a multitude of different symptoms. Hence the global term “Repetitive Strain Injury” which is really an umbrella term for a wide array of more specific but little known ailments.

From my own perspective I have been using computers for a long time (circa early 1980s – from Sinclair ZX81s to Commodore 64s, to BBC Micros, to mainframes, to early IBM PCs, to Sun workstations) and did not have the benefits of a still evolving ergonomics industry. It is after all only in the last 5 to 10 years that ‘ergonomist’ was recognised as a job function. Indeed, it’s only just over 10 years ago that computers started to appear as common on peoples desks as a telephone. In many ways people in today’s generation will reap the benefits from emerging ergonomic knowledge obtained from years of watching cases like mine escalate in the computer using workforce.

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