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Exercise Physiologist
Sitting places 140% pressure through your discs when sitting, compared to 100% during standing. Using a swiss ball is great to get your back extensors working but the trouble with using it at a desk is those muscles then have to work for the length of time you sit (if at work this could be for 6-8 hours). Imagine holding your arm out straight in front of you at shouder height for 6-8 hours - how would it feel at the end of the day?
The other important consdieration is the general health impact of sitting. Sedentary activity (ie sitting) for extended periods at work, home etc is linked with an increased risk of chronic disease and a shorter life expectancy. We spend enough of our days sitting down so any excuse to stand up is great.
From a risk point of view there are also falls risks associated with using a swiss ball.
The good thing about standing workstations is there are now a number of models that attach directly to a standard desk and can be reasonably affordable (around $600)
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Physiotherapist
I recommend that people change their posture quite regularly (every 30mins, spend 1-2 mins moving).
Both a Swiss ball and standing desk have their advantages and disadvantages. The main disadvantage is that you can put yourself in a terrible posture with either of them. Fatigue for both will set in and you will then adopt sub-optimal postures.
It is best to be mindful of your posture when you can and regularly change it.
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Physiotherapist
This all depends on the postural setup of the person and their tolerance for standing. Sitting on a swift ball can be beneficial for your posture. The good thing about sitting on a swift ball is that it keeps your body moving and it keeps your muscles active and engaged. It can be quite tiring for a person to sit all day on a swift ball,they could get very tired which could cause back strain.
Working at a standing station would mean standing up at work for a full day which is probably not a good idea. You get lots of stasis in your legs, lots of circulation issues and again, this can be very tiring.
I would recommend to the person to do a variety of work postures throughout the day and not just the same one.
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