Feeds

Why do some people feel the cold more than others?

Some like it hot

Secure remote control for conventional and virtual desktops

Also in this week's column:

Why do some people feel the cold more than others?

Asked by Mick Higgins of Toronto, Canada

Human body temperature is a measure of the body's ability to keep, generate, or get rid of heat as the need arises. The body is very adept at maintaining temperature within a narrow and safe range, despite occasional huge variations in the room temperature.

But some bodies are more efficient than others. Even bodies of the same height and weight may differ dramatically in the ability to maintain body temperature.

Humans also differ in their preferred room temperature. Some like it warmer, some cooler. This is called thermal comfort. Thermal comfort is not merely physical, but psychological too. In one's choice of preferred temperature, besides psychology, other personal factors come into the equation. Two of these are clothing levels (their insulation value) and activity level (their effect on body metabolism).

Stephen Turner, an engineer with the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) in Atlanta, said: "Activity level is a key factor, as illustrated by the story of an adult skiing down a mountain with a child bundled in warm clothes on their back. At the bottom of the hill, the adult is sweating, but the child is bitterly cold. Difference in metabolic rate is the cause."

ASHRAE maintains and periodically revises international thermal comfort standards. But this is not the end of the story.

According to Paul Spry, a consultant engineer in Canberra, Australia, there is also evidence that a person's thermal comfort perceptions are influenced by external factors such as recent weather.

He adds: "Another consideration is the difference between sensory and psychological reactions. A particular person may say it is cold or cool, but if you accept this as the final judgment (as a desire for a higher temperature) you are at risk. Further questioning may reveal that though the person is 'cold' or 'cool' they may be optimally comfortable (desire no change for thermal comfort reasons)."

Interesting facts

  • When you are hot, the blood vessels in your skin expand (dilate) to carry the excess heat to your skin's surface where it is released. You sweat and as the sweat evaporates, it cools the body.
  • When you are cold, your blood vessels in your skin narrow (contract) so that blood flow to your skin is reduced to conserve body heat. You may start shivering, which is involuntary, experience rapid contraction of the muscles. This extra muscle activity helps generate more heat. Both processes help keep your body temperature with the required narrow and safe range.

Stephen Juan, Ph.D. is an anthropologist at the University of Sydney. Email your Odd Body questions to s.juan@edfac.usyd.edu.au

Top 5 reasons to deploy VMware with Tegile

More from The Register

next story
Antarctic ice THICKER than first feared – penguin-bot boffins
Robo-sub scans freezing waters, rocks warming models
I'll be back (and forward): Hollywood's time travel tribulations
Quick, call the Time Cops to sort out this paradox!
Your PHONE is slowly KILLING YOU
Doctors find new Digitillnesses - 'text neck' and 'telepressure'
Reuse the Force, Luke: SpaceX's Elon Musk reveals X-WING designs
And a floating carrier for recyclable rockets
NASA launches new climate model at SC14
75 days of supercomputing later ...
Britain's HUMAN DNA-strewing Moon mission rakes in £200k
3 days, and Kickstarter moves lander 37% nearer takeoff
prev story

Whitepapers

Go beyond APM with real-time IT operations analytics
How IT operations teams can harness the wealth of wire data already flowing through their environment for real-time operational intelligence.
5 critical considerations for enterprise cloud backup
Key considerations when evaluating cloud backup solutions to ensure adequate protection security and availability of enterprise data.
Getting started with customer-focused identity management
Learn why identity is a fundamental requirement to digital growth, and how without it there is no way to identify and engage customers in a meaningful way.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Simplify SSL certificate management across the enterprise
Simple steps to take control of SSL across the enterprise, and recommendations for a management platform for full visibility and single-point of control for these Certificates.