I think that "recipe for DCS" is a bit dramatic. Even DAN is a wee bit uncertain about this. I would be interested to see real research on this.Where did you get the 4 hour advice from?
This is covered in most grade school DCS courses. The heating and minor blunt force style (not normally injurious) massaging techniques cause localized expansion of nitrogen within dermatological and vascular systems which may cause DCS.
