The<unk>  is a cardiovascular<unk>  performed by immersing the hand into an ice water container, usually for one minute, and measuring changes in blood<unk> e and heart rate. These changes relate to vascular response and pulse excitability. Other measures can also be obtained from the<unk><unk>  such as pain threshold and pain tolerance. This is done by requiring a participant to place their hand in the<unk><unk>  for as long as they can. Once pain is present, they let the researcher know. Once the pain is unbearable, the participant removes his/her hand. This provides a measure of threshold (first feeling pain) and tolerance (total time minus threshold). This method is the most frequently used application of the<unk><unk>  task. Comparable in terms of pain elicitation is the hot water immersion<unk> , the equivalent to the<unk><unk>  using hot water. The hot water immersion<unk>  (HIT) is equally capable of triggering a pain response without the confounding of baroreflex activation. __TOC__
Cold pressor test
Tourniquet test
Pressure reactivity index
Photoplethysmogram
Sphygmograph
Contraction stress test
Tilt table test
Capnography