ISSN:
1439-6327
Keywords:
Energy substrates
;
Metabolism
;
Temperature regulation
;
Thermogenesis
;
Shivering
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract The increased metabolic heat production in humans exposed to cold stress results from an increased oxidation of both carbohydrate and fat to provide energy to sustain temperature homeostasis. Research suggests that dietary manipulations may enhance metabolic heat production, thereby delaying hypothermia. Therefore, the present investigation examined the thermogenic effect of a sequential timed feeding regime of either a carbohydrate (CHO) or a placebo beverage (PL) before and again midway through 120 min of exposure to 8, 12 and 27° C in well-nourished men. The following were examined: tissue insulation (I), rectal temperature (T re), mean skin temperature $$\bar T_{{\text{sk}}}$$ , metabolism (M), time-weighted heat production and respiratory exchange ratio (R).T re, ΔT re, $$\bar T_{{\text{sk}}}$$ M, ΔM,I and time-weighted heat production revealed no significant differences between treatment (PL vs CHO) at any temperature (8, 12 and 27° C). However,T re decreased (P 〈 0.05) as time increased at 8, 12 and 27° C while M increased (P 〈 0.05) andI decreased (P 〈 0.05) at 8 and 12° C. At 8 and 27° C,R differed (P 〈 0.05) between the PL and CHO treatments. In addition, at 8 and 12° C,R increased (P 〈 0.05) across time reflecting the feeding. From these data it appears that while substrate utilization differed between dietary treatment (8 and 27° C) and across time, this feeding regime did not differentially affectT,T re, $$\bar T_{{\text{sk}}}$$ andI during 120 min of exposure to 8, 12 and 27° C.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00571445
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