The persistence and transfer of voluntary hand-warming in natural and laboratory cold settings after 1 year.

Hayduk (1980) used a classical conditioning-biofeedback overlap (CBO) design to teach six volunteers to warm their hands in an ambient temperature of - 14 degrees C. He found voluntarily warmed hands to be more dexterous, more sensitive, and less painful in the cold laboratory setting than unwarmed hands. The present paper reports a 1-year follow-up of five of Hayduk's original six volunteers. Ability to hand-warm was reevaluated, both at room temperature and at - 14 degrees C and was found to be essentially unchanged from post-training performance of the previous year. The effects of hand-warming on performance, sensation, and cold pain were remeasured in the cold laboratory and found to be essentially unchanged from the effects following training the previous year. Finally, the volunteers were asked to describe the degree to which they had used their hand-warming, and the circumstances under which they had used it, in natural settings throughout a Canadian winter. The volunteers reported only minimal use of hand-warming, primarily to reduce cold pain.