Monday, February 10, 2020

"Army scientists testing how to keep warm without gloves"

Army Times:

Forearm warmers, which are intended to simulate the warming effects of exercise, required about 41 watts of electricity — about what is required to power a low-light house lamp. By using a warmer wrapped around a test subject’s forearm, researchers were able to raise the finger skin temperature from 50 degrees to 55 degrees. While small, that slight bump added 50 percent more dexterity.

The goal, Castellani said, is to reach about 60 degrees for finger skin temperature.

But researchers didn’t only try to warm the hands that way, they also tried to increase blood flow by warming a subject’s face.

“The face was tested because our physiological knowledge tells us that cooling the face causes a constriction in the blood vessels supplying the periphery (hands and feet),” he said.

The group tried the reverse, seeing if heating the face would also heat the hands and feet.

“It didn’t prove so”