B. K. Hutt

The effects of age on finger temperature responses to local cooling

Abstract Finger temperature measurements were made before, during, and after a period of immersion of the hand in a 10° C. water bath on healthy individuals varying in age from 6 to 83 years. The hunting reaction tended to occur less frequently with the advancing age of the subjects. Similarly the rates of cooling and rewarming of the finger appeared to be influenced by the age of the individual. It is suggested that these differences in response to a local cold stimulus were related to changes in vascular reactivity.

Cardiac dynamics and coronary blood flow consequent to acute hemorrhage.

Abstract The rapid removal of a large volume of blood from an animal leads to a lowered arterial pressure, cardiac output, coronary blood flow and an increased extraction of oxygen by the myocardium. These responses are not greatly modified during the first hour of adjustment to this stress. The major corrective responses observable at this time were increases in cardiac output and coronary vascular resistance accompanied by a decrease in total peripheral vascular resistance. The coronary blood flow had not returned to its normal value although the fraction of the cardiac output delivered to the left ventricular muscular mass was essentially normal.