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The effect of carbon dioxide on shiv...

Lun, Victor.

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The effect of carbon dioxide on shivering thermogenesis.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	The effect of carbon dioxide on shivering thermogenesis./
Author:	Lun, Victor.
Description:	124 p.
Notes:	Adviser: Igor Mekjavic.
Contained By:	Masters Abstracts International32-03.
Subject:	Biology, Animal Physiology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=MM83798
ISBN:	9780315837980

The effect of carbon dioxide on shivering thermogenesis.
Lun, Victor.

The effect of carbon dioxide on shivering thermogenesis. - 124 p.

Adviser: Igor Mekjavic.

Thesis (M.Sc.)--Simon Fraser University (Canada), 1992.

The combined results of the study suggest that both acute and prolonged exposures to moderately elevated levels of CO$\sb2$ do not have a significant inhibitory effect on shivering thermogenesis. (Abstract shortened by UMI.)

ISBN: 9780315837980Subjects--Topical Terms:

1017835
Biology, Animal Physiology.

The effect of carbon dioxide on shivering thermogenesis.
LDR:03290nam 2200301 a 45 001 967782
005 20110915
008 110915s1992 eng d
020 $a 9780315837980
035 $a (UMI)AAIMM83798
035 $a AAIMM83798
040 $a UMI $c UMI
100 1 $a Lun, Victor. $3 1291654
245 1 4 $a The effect of carbon dioxide on shivering thermogenesis.
300 $a 124 p.
500 $a Adviser: Igor Mekjavic.
500 $a Source: Masters Abstracts International, Volume: 32-03, page: 0910.
502 $a Thesis (M.Sc.)--Simon Fraser University (Canada), 1992.
520 $a The combined results of the study suggest that both acute and prolonged exposures to moderately elevated levels of CO$\sb2$ do not have a significant inhibitory effect on shivering thermogenesis. (Abstract shortened by UMI.)
520 $a The effects of both prolonged and acute hypercapnia on human thermoregulation during cold exposure were investigated in two sets of experiments in which hypothermia was induced by immersion of subjects to the neck in a 15$\sp\circ $c water bath until their core temperatures dropped to 35$\sp\circ $c or until one hour of immersion had elapsed. In the first series of experiments, designed to assess the effects of prolonged exposure to hypercapnia, seven male subjects were immersed on two separate trials. During the AIR trial (control), subjects inhaled compressed air (0.03% CO$\sb2$, 20.93% O$\sb2$, and balance N$\sb2$), while in the CO$\sb2$ trial, the inhalate was a 4% CO$\sb2$, 20% O$\sb2$, and 76% N$\sb2$ gas mixture. In the second series of experiments, eight male subjects were immersed and the effects of acute hypercapnia were tested by switching the inhaled gas mixture from compressed air to one containing 4% CO$\sb2$, 20% O$\sb2$, and 76% N$\sb2$ for a 15 minute period beginning when subject core temperatures had attained 36.5$\sp\circ $c . During both sets of experiments, oxygen uptake (VO$\sb2$, L-min$\sp{-1}$), inspired minute ventilation (V$\sb{\rm l}$, L-min$\sp{-1}$), esophageal and rectal temperatures (Tes and Tre, respectively, $\sp\circ $c ), mean unweighted skin temperature (Tsk, $\sp\circ $c ), mean heat flux (Q, W-m$\sp{-2}$), and electromyographic activity (EMG, millivolts) of the trapezius muscle were recorded, from which VO$\sb2$ and integration of EMG activity (IEMG) were used as the primary indicators of shivering thermogenesis.
520 $a In the first set of experiments, the difference in the level of IEMG of the trapezius muscle at esophageal temperatures of 36.0, 35.75, 35.5, and 35.0$\sp\circ $c were not significantly different between the AIR (control) and CO$\sb2$ trials. VO$\sb2$ was slightly higher in the CO$\sb2$ trial compared to the AIR trial, but differences were not significant.
520 $a In the second series of experiments, the integrated electromyographic activity of the trapezius muscle immediately following switch of the inhaled gas mixture from air to 4% CO$\sb2$ was not found to be significantly lower compared to the IEMG just before the switch.
590 $a School code: 0791.
650 4 $a Biology, Animal Physiology. $3 1017835
690 $a 0433
710 2 0 $a Simon Fraser University (Canada). $3 1020621
773 0 $t Masters Abstracts International $g 32-03.
790 $a 0791
790 1 0 $a Mekjavic, Igor, $e advisor
791 $a M.Sc.
792 $a 1992
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=MM83798