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Users of the iPad, or any other tablet, are at high risk of developing neck discomfort, according to study done by the Harvard School of Public Health. The problem comes from the way people position themselves when using the devices, especially when doing so for a long period of time.

"If you think about your position when you are hunched over looking down, your head is hanging out over space, so you are using your neck muscles to support the weight," said lead writer of the Harvard study Jack Dennerlein.

The study concluded that of the major ways people view their tablets, the "table-movie" position, which requires users resting the device at a sharp angle on a table, is best for the health of the neck and shoulder. For those who use their tablets for prolonged period times, they can put their tablet in this position with many of the cases currently offered the iPad.

Incase and Griffin both offer cases that allow users to prop the iPad at an angle, and Apple's smart covers do the same.

While tablet use has its drawbacks, the study also points out some positives about the device. People using tablets often do so for shorter period of time than those who use computers, lessening eye strain, and they are also more likely to change positions and move around more than if they were on a laptop or desktop PC.

Other studies have examined the connection between mobile device usage on repetitive stress injuries. As the usage of smartphones and tablets grows with consumers, physical ailments like eye strain and neck and shoulder soreness will likely grow.

Apple did not comment on Harvard's findings, but the company could take the study into account in the future by recommending a preferred way to use its tablet.

The same team behind the shoulder and neck study will test the device's effect on the arms and wrists next. However, regardless of any potential risks more studies might turn up, it's unlikely to have an effect on how much people use their tablets.