Printer Friendly
The Free Library
22,728,043 articles and books

Freeze factor: Professor Popsicle knows how to survive a plunge into icy waters. Do you?



CRACK! The ice beneath your skates splinters splin·ter  
n.
1. A sharp, slender piece, as of wood, bone, glass, or metal, split or broken off from a main body.

2. A splinter group.

v. splin·tered, splin·ter·ing, splin·ters

v.
. In a split second, a gaping hole opens and you drop into frigid frig·id
adj.
1. Extremely cold.

2. Persistently averse to sexual intercourse.
 waters. You panic. You gasp. What next?

That's the question That's the Question is an American quiz game show on GSN, hosted by game show veteran and former Entertainment Tonight reporter, Bob Goen, which premiered in October 2006.  Gordon Giesbrecht (GEEZ-brekt), aphysiologist (scientist who studies the body's vital functions (Physiol.) those functions or actions of the body on which life is directly dependent, as the circulation of the blood, digestion, etc.

See also: Vital
) and director of the University of Manitoba's Laboratory for Exercise and Environmental Medicine, tries to answer. Giesbrecht is one of the world's leading experts in hypothermia hypothermia

Abnormally low body temperature, with slowing of physiological activity. It is artificially induced (usually with ice baths) for certain surgical procedures and cancer treatments.
: a condition in which the body's normal core temperature drops from 37[degrees]C (98.6[degrees]F) to 35[degrees]C (95[degrees]F) or below. Unlike researchers who work in the comfort of labs to study the human body's response to cold, Giesbrecht seeks firsthand first·hand  
adj.
Received from the original source: firsthand information.



first
 experience. That's why he regularly hops into lakes--and even truck-size tanks of ice--as trained assistants monitor his body's core temperature, pulse, and other vital stats.

Giesbrecht's toe-numbing experiments have earned him the nickname "Professor Popsicle"--a title that has rightfully stuck like a wet tongue on a cold metal pole. "I probably hold the world record for the number of times I've experienced hypothermia," he boasts. That record: 37 occasions.

Why would anyone voluntarily turn into a human ice pop? Giesbrecht is gathering data on how humans handle a spill into cold water--usually defined as water that's 20[degrees]C (68[degrees]F) or below. He hopes his findings will stomp out common myths about hypothermia. "Most people have a poor idea of what happens when you fall into cold water. They think you'll die of hypothermia in 5 to 10 minutes," Giesbrecht says. The truth is, "you won't die for at least an hour or two." That means you might be alive when rescue finally arrives.

The trick: Learn how your body regulates its temperature, and know how much time you have before your nerves (bundles of cells that carry signals between parts of the body and the brain and spinal cord spinal cord, the part of the nervous system occupying the hollow interior (vertebral canal) of the series of vertebrae that form the spinal column, technically known as the vertebral column. ), muscles, and heart shut down due to the cold.

FIGHT THE FREEZE

Your body constantly works to warm you. In a process called metabolism, billions of cells release energy stored in food. Your body converts this fuel into heat, which blood vessels Blood vessels

Tubular channels for blood transport, of which there are three principal types: arteries, capillaries, and veins. Only the larger arteries and veins in the body bear distinct names.
 ferry to every inch of your body.

Meanwhile, an internal thermostat thermostat, automatic device that regulates temperature in an enclosed area by controlling heating or refrigerating systems. It is commonly connected to one of these systems, turning it on or off in order to maintain a predetermined temperature.  located in the hypothalamus hypothalamus (hī'pəthăl`əməs), an important supervisory center in the brain, rich in ganglia, nerve fibers, and synaptic connections. It is composed of several sections called nuclei, each of which controls a specific function.  tracks your body's temperature. This peanut-size gland in the brain controls your body's core temperature--keeping it at a steady 37[degrees]C (98.6[degrees]F)--no matter what outside temperatures you face.

Sensors along your skin and inside your body feed the hypothalamus information about the temperatures of each part of your body. "The hypothalamus takes that information and sums it up," says Giesbrecht. If the hypothalamus concludes that you're cold, it instructs your body to start a process called peripheral vasoconstriction vasoconstriction /vaso·con·stric·tion/ (-kon-strik´shun) decrease in the caliber of blood vessels.vasoconstric´tive

va·so·con·stric·tion
n.
 (puh-RIF-uh-ruhl VASE-oh-con-STRIK-shun): "The blood vessels in your fingers, hands, and feet, for instance, will constrict con·strict
v.
To make smaller or narrower, especially by binding or squeezing.
. The diameter will decrease and the blood flow will decrease," he says. The reduced blood flow keeps body heat from escaping through your extremities ex·trem·i·ty  
n. pl. ex·trem·i·ties
1. The outermost or farthest point or portion.

2. The greatest or utmost degree: the extremity of despair.

3.
a.
.

If that's not enough to keep you toasty toast·y  
adj. toast·i·er, toast·i·est
Pleasantly warm.
, you'll start to shiver shiver

involuntary shaking of the body, as with cold. It is caused by contraction or twitching of the muscles, and is a physiological method of heat production in all animals.
 (experience rapid cycling between relaxed and contracted muscles). "We shiver to produce heat," Giesbrecht explains. Shivering shivering /shiv·er·ing/ (shiv´er-ing)
1. involuntary shaking of the body, as with cold.

2. a disease of horses, with trembling or quivering of various muscles.


shivering

see shiver, stringhalt.
 can increase your heat production by five to six times the normal amount.

REMEMBER: 1 MINUTE, ID MINUTES, 1 HOUR

Too much time in icy water can be a challenge for your hypothalamus. If you were to accidentally fall into cold water, you would lose a lot of body heat to the surrounding water. That's because heat energy moves from warmer objects (you) to objects with less heat (the cold water). And due to its greater density, water pulls heat away from the body about 27 times faster than air at the same temperature. This rapid heat loss, says Giesbrecht, would eventually bring a victim into the first stages of hypothermia (see Nuts & Bolts, right). And he should know. Last winter, Giesbrecht plunged into a vat of ice water on the Late Show with David Letterman “Late Show” redirects here. For other uses, see The Late Show.
The Late Show with David Letterman is a multiple Emmy Award-winning hour-long weeknight comedy talk show broadcast by CBS from the Ed Sullivan Theater on Broadway in New York City.
 to demonstrate what people should do if they find themselves in similarly cold waters. His advice? Remember this frosty frost·y  
adj. frost·i·er, frost·i·est
1. Producing or characterized by frost; freezing. See Synonyms at cold.

2. Covered with or as if with frost.

3. Silvery white; hoary.

4.
 phrase: 1 minute, 10 minutes, 1 hour.

After taking the icy plunge before 5 million late-night viewers, Giesbrecht began to explain: "You have one minute to get your breathing under control." That's important because your body's initial cold-shock response causes uncontrolled breathing that can make you gasp, possibly leading you to swallow water and drown.

Next, you have about 10 minutes of meaningful movement to try to escape the ice-cubelike conditions. Soon after that, your muscles and nerves will lose their might, and you'll be saying farewell to your strength. So make the most of this time. "When you're freezing, it's hard to lift yourself straight up," Giesbrecht says. "Instead, put your arms on the edge of the ice and do a flutter kick flutter kick
n.
A swimming kick used in crawl and backstroke in which the legs are extended straight back and alternately moved up and down with a slight bend in the knee on the upward movement.

Noun 1.
 so your body becomes horizontal with the water's surface. Then kick and pull." That way, you're dragging yourself onto the ice--an easier task than pushing up onto it.

Unsuccessful? Stop struggling. You have up to one hour before you lose consciousness from hypothermia.

JUST CHILLIN'

The good news? "If you don't drown at this point, you might even have an additional hour before your heart stops," Giesbrecht encourages. So if no one is there to rescue you, Giesbrecht recommends keeping your arms on the ice. The hope: Though you'll be unconscious, you'll stick to it like superglue superglue
Noun

an extremely strong and quick-drying glue

superglue ncola de contacto, supercola

superglue n
 until help arrives.

After Giesbrecht's late-night demo, a colleague used rope to pull him to safety. As he re-warmed, Giesbrecht had time to reflect on his lab's motto: "Keep cool, but don't freeze."

Nuts & Bolts

When the body's core temperature drops to 35[degrees]C (95[degrees]F), hypothermia sets in. There are three stages of hypothermia.

* MILD: 32[degrees] - 35[degrees]C (90[degrees] 95[degrees]F). You feel cold; muscles shiver.

* MODERATE: 28[degrees] - 32[degrees]C (82[degrees]90[degrees]F). Shivering stops; muscles tighten; experience mental confusion and unconsciousness.

* SEVERE: Below 28[degrees]C (82[degrees]F). Pulse slows; the heart could stop at any moment.

It's Your Choice

1 Water pulls heat from your body -- than air.

(A) 14 times slower

(B) 27 times faster

(C) 35 times slower

(D) 50 times faster

2 The hypothalamus acts to regulate your

(A) body's core temperature.

(B) heartbeat.

(C) muscle growth.

(D) blood pressures.

3 If you were to fall into icy water, you would have about

(A) one minute before you died.

(B) 10 minutes to get your breathing under control.

(C) one hour before your heart stopped.

(D) one hour before you lost consciousness.

1. b 2. a 3. d

DID YOU KNOW?

* Nearly 700 Americans die annually from hypothermia.

* Many people have died trying to save pets that have fallen through an ice-covered lake. Physiologist Gordon Giesbrecht of the University of Manitoba Location
The main Fort Garry campus is a complex on the Red River in south Winnipeg. It has an area of 2.74 square kilometres. More than 60 major buildings support the teaching and research programs of the university.
 advises people to never go after a pet who has fallen through the ice; if the ice couldn't support a dog, it can't hold a person who weighs more.

* If you fall through ice and manage to pull yourself out of the water, do not stand up. Instead, roll away from the opening you fell through. This distributes your weight across a greater area so there is less pressure on the ice.

CRITICAL THINKING:

* The best way to survive hypothermia is to avoid it in the first place. Discuss: Under what conditions is hypothermia a threat? What precautions should you take to stay safe?

CROSS-CURRICULAR CONNECTIONS"

ART: Create a poster that teaches about hypothermia. Include a body diagram and hypothermia prevention tips.

RESOURCES

* Grolier search term: hypothermia

* To learn how to protect against hypothermia, visit: www.princeton.edu/~oa/safety/hypocold-shtml

CHECK FOR UNDERSTANDING

Name: --

DIRECTIONS: Answer the following in complete sentences.

1. What is hypothermia?

2. What is the body temperature range for each of the three stages of hypothermia? Describe the symptoms a person might experience during each stage.

Mild:--

Moderate:--

Severe:--

3. What is shivering, and how does it help the body?

Freeze Factor

1. Hypothermia is a condition in which the body's normal core temperature drops from 37[degrees]C (98.6[degrees]F) to 35[degrees]C (95[degrees]F) or below.

2. Mild: Between 32[degrees] - 35[degrees]C (90[degrees] - 95[degrees]F), you feel cold, and your muscles shiver.

Moderate: Between 28[degrees] - 32[degrees]C (82[degrees] - 90[degrees]F), shivering stops. Your muscles tighten. You experience mental confusion and unconsciousness.

Severe: Below 28[degrees]C (82[degrees]F), your pulse slows; your heart could stop at any moment.

3. When you shiver, you experience rapid cycling between relaxed and contracted muscles. You shiver to produce heat, Shivering increases your heat output by five to six times.
COPYRIGHT 2004 Scholastic, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 2004, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

 Reader Opinion

Title:

Comment:



 

Article Details
Printer friendly Cite/link Email Feedback
Title Annotation:Human Body
Author:Janes, Patricia
Publication:Science World
Date:Nov 22, 2004
Words:1454
Previous Article:Turkey time: celebrate thanksgiving with these wild birds.
Next Article:Hands-on Science (no lab required).
Topics:



Related Articles
Squirrel sleeps at a fluid subzero.
Observatory spies some familiar compounds.
Visions of Europa: Galileo tour heightens speculation about life on Jovian moon.
You Asked....
Frozen Science.
LICK THE SUMMER HEAT CHILL OUT WITH HOMEMADE POPS AND GRANITAS.
BRIEFLY : GRAND JURY PROBE OF BELMONT SOUGHT.
Life on ice: extreme cold is both a killer and lifesaver. Learn how scientists are tapping its powers to preserve body organs--and corpses. (Life...
Cold Buster.
Five element acupuncture and the healing potential of water.

Terms of use | Copyright © 2014 Farlex, Inc. | Feedback | For webmasters