Yamaha DTXpress/DTXplorer/DTXtreme

In the store I noticed that playing the rubber pads caused a higher 
strain on my wrists. A smaller part of the energy of the impact is 
transfered to the drums and more seems to be absorbed in the wrists. 
That last part may be because my own lack of technique, I don't know. 
What I do know is that if you start to feel painfull or annoying 
sensations in your wrist arm or shoulder/higher back, you should be 
carefull, really carefull. You could end up with a severe case of RSI 
or CTS(repetitive strain injury or carpal tunnel syndrome; these are 
caused by irritated nerves which are pushed to their limits, they 
then encapsulate themselves), which can only be healed with absolute 
rest. Especially if you have a job which involves a lot of 
computerwork your at risk if you don't rest your muscles. It could 
also be that you just are'nt used to playing this type of surface and 
that your body has to get used to it, build some extra muscles. 
The only thing I can advise you when the symptoms don't disappear is; 

- Always warm up your muscles.
- Take short rests (30 sec.) when practising, every couple of minutes.
- While resting do some exersises like shoulder rolling, juggling a 
bit with a small ball. Walk around a bit while doing this.
- Make sure you have a good position behind the kit. Always be at the 
right hight. Make sure to have a straight back. Set up your kit the 
way that you can reach every pad with the least amount of effort.
-Work on your stick technique, so that a minimum of the energy of the 
impact is transferred to the wrist and the least amount of energy is 
needed to strike hard.
- Listen to your body.

I am not a doctor nor a drum instructor, but I have seen some bad 
cases of RSI or Carpal Tunnel Syndrome. Not necesserally with 
drummers but a lot with people who work with computers (especially 
mousing). I have seen people having to stop their study for over a 
year because in the end they were unable to turn the page of a 
textbook or type a paper. I'm not saying that you have one of these 
injuries, this is a general warning to every drummer out there. When 
you first start noticing the injuries you're already at risk.

P.S. By the way, there's nothing wrong with aching muscles the day 
after a good drum work-out. ;-) Just beware of painfull nerves. If 
you're worried please see a doctor, he should know a hell of a lot 
more than I do...