Diver-Drex
Contributor
Having cold hands and feet, seems to me logical but not related that much of core temperature because does are the body parts with less flesh and blood circulation so the water temp will affect them first, if one start to shiver that is a indication that your core temperature has been compromised, you shall never get to that point, probably not the right amount of thermal protection.
@Remy B. - When the body detects that it's core temperature is dropping blood flow to the extremities (hands and feet) is reduced. The body does this in an attempt to preserve heat. So cold hands and feet, while not always the case, are a very good indicator that your core temperature is dropping.
The theory is that the same reduction in blood flow also reduce perfusion and thus increases DCI risk.
D