Dr Simon, DC

Hercules shield. Definitely!

@Nik: Here's the comment from a chiropractor: Any repetitive motion done for a continuous length of time without pausing or a new motion that is being learned can create irritation to the tissues surrounding/controlling the joints in action. The weight factor is an issue, where less weight requires more identical repetitions before it can injure the tissues, versus more weight requires less identical repetitions before it becomes an issue.

So in this case, the question is: Can motion sensor controllers be more of a health hazard than the conventional controllers? Answer is no. You'll be using bigger muscle groups in order to create the motion (in the shoulders, elbows) instead of having all control being concentrated through the fingers/thumbs. The finger motion is simple (press 2-3 mm repeatedly), the thumb motion is more complex (smooth control w/ the analog thumb sticks), the motion sensor controller will require a complex motion of the upper body, so bigger movements.

As with anything, your body will strengthen itself for the job at hand, if it is being sollicited in a gradual way - which doesn't happen with video games! IE when you first get your shiny new console, you're not going to play "just one hour" and take a break, but play it non-stop because you can't believe how fabulous and wonderful it is... You'll be glued to your living room for hours and hours on end, eating junk and not caring much about your health at that point, ahahah! So theory VS practice is very different!

Hope that helps clear things out!