audiojan - 2013-04-30 3:15 AM Tom Demerly wrote a great article a few years back... http://www.bikesportmichigan.com/features/sbend.shtmlI'm guessing that you are causing reduced circulation and it could also be related how hard you're gripped the extensions. Try just resting your palms on the extensions without gripping them.
I hate that article and the x-rays because they are not representative of how people actually hold the bars. They are intentionally flexing their wrists in an awkward position.
I agree with Jan though - you could be holding the extensions too tightly. Try holding them with relaxed arms/hands (palms against the extensions to help with control and a light grip with the fingers), and even shoulders. You should be able to hold the TT position with a very relaxed upper body, with elbows bent at a 90 deg angle.
One of the beauties of the s-bend is that you can adjust your position forward and back on the bars. Try moving around a little to keep the blood flowing. I find this helps with sore spots too.