Break reminder software reminds computer users to take regular breaks. It has been used for years. -

i am looking for  serious studies on the effects of regular breaks,

and the effect of self regulation of the break interval VS fixed intervals ?

has anyone looked at the personality types and the kind of break reminder use and profiling that goes along with different personalities ? 

NOTE: The software I have been using is  Workrave

it is marketed (it's free) as: "a program that assists in the recovery and prevention of Repetitive Strain Injury (RSI). The program frequently alerts you to take micro-pauses, rest breaks and restricts you to your daily limit. The program runs on GNU/Linux and Microsoft Windows"

http://www.workrave.org/