It's called 'white finger disease' (aka 'vibration induced white finger', 'hand-arm vibration syndrome', ' Raynauds' syndrome', sometimes misdiagnosed as carpal tunnel syndrome, etc.). And its real.
It does NOT, however, have anything to do with the low-kickback chains which are so dearly loved on A.S.
Both STIHL and Oregon have developed chains that reduce vibration through the shape of the cutters, tie straps, etc. If you think about each tie strap slamming and slapping against the sprocket each time it passes by at 12,000 RPM, and against the bar rails each time the cutter digs in, you can appreciate how all those little bangs add up to quite a buzz. The low vib chain versions reduce some of that via engineering magic.
Again, even though some low kickback chains may also be low vibe, YOU DO NOT HAVE TO BUY A LOW KICKBACK CHAIN TO GET A LOW VIB CHAIN (sorry, was I getting worked up there?).
That said, you will do more to reduce vibration exposure by:
- keeping your chain properly sharpened and tensioned so that it cuts smoothly, rather than bounces;
- get rid of sloppy bars and sprockets;
- keep your saw tuned so that the motor runs smooth;
- get a saw with good anti-vibe mounts (springs or bushings) - getting better on newer, high quality saws.
- consider good quality anti-vibe gloves
http://www.cdc.gov/niosh/83110_38.html
http://www.cdc.gov/niosh/docs/97-141/ergotxt5c.html
Some vendors for A/V gloves:
Ergodyne
http://www.ergodyne.com/
Impacto
http://www.2protect.com/
Decade
http://www.chaseergo.com/CHASEERG/PRODUCT/vibthum.htm
Philbert