The region of the lateral thorax, previously identified as an area of high heat transfer during cold water immersion, was investigated using heat flow discs and thermography to determine values of local heat flow and surface temperature before, during and after immersion. The effect of different positions of the arms on local heat flow from the torso was also investigated. No large site-to-site variation in local heat flow was detected for immersion in water temperatures in the range 18.7-24 degrees C. When the arms were positioned close to the torso, there was a decrease in local heat flow and an increase in local surface temperatures. Thermographic examinations revealed local regions of elevated temperature after the arms were briefly held against the body in the post-immersion stage. In this circumstance, erroneous results can follow from the assumption that an elevated surface temperature always constitutes a signal of increased regional heat flow.