By Bob Reinert for USAG-Natick Public Affairs

Capt. David DeGroot, Ph.D., puts volunteers into a water immersion tank at the U.S. Army Institute of Environmental Medicine at Natick Soldier Systems Center as part of a study that is looking at how Soldiers' bodies cool down. (By David Kamm,NSRDEC Photographer)
Seventeen years after four soldiers died from hypothermia during the final phase of Ranger School, researchers at the U.S. Army Research Institute of Environmental Medicine at Natick Soldier Systems Center continue to study how the human body cools down, in hopes of one day developing medical techniques to help prevent such tragedies.
“You can’t design possible countermeasures — pharmacological treatments, perhaps — until you know mechanisms,” said Capt. David DeGroot, Ph.D., a research physiologist in USARIEM’s Thermal and Mountain Medicine Division, who is leading the study. “You’ve got to understand the basic mechanism before you (say), ‘Okay, now how do I target it?’
“This is going to allow us to get further insight with the actual mechanisms so that we can follow it up with, Okay, what could we possibly do in terms of an intervention to mitigate that rate of core temperature drop?”
Dr. John Castellani, serving as an Army captain with USARIEM at the time, was a member of the team that conducted the institute’s initial study at Camp Rudder on Eglin Air Force Base, Fla., soon after the February 1995 deaths. He still works at the institute as a research physiologist.
Castellani said that the original study led to adjustments to the tables Rangers use to determine what amount of exposure to cold is safe.
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