EFFECTS OF A HIGH-ENERGY FOOD SUPPLEMENT ON COLD-INDUCED THERMOGENESIS

Authors
  1. Vallerand, A.L.
  2. Jacobs, I.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
In previous studies, we have not been able to confirm the theory that energy substrate mobilization is a limiting factor for cold-induced thermogenesis in humans. One possible explanation for the conflicting results is that the dose of energy substrates may not have heen optimal. The goal of this study was to determine whether the ingestion of a high-energy food supplement (710 kcal or 2,970 kJ; Ensure Plus (TRADEMARK)) in the cold could alter: 1) cold-induced thermogenesis, 2) heat balance (min by min determination of heat debt where heat debt = cold induced thermogenesis - heat losses), 3) rectal (T sub re) and 4) mean skin temperatures, 5) rates of substrate oxidation and 6) plasma levels of substrates and hormones, taken as indices of substrate mobilization. Seven healthy males were subjected to two semi-nude cold exposure tests (3h at 7C, 1 m.s-1 wind, fasting, tests performed 1 wk apart). The ingestion of a high-energy supplement did not influence either T sub re, skin temperatures, cold-induced thermogenesis, or heat debt in comparison to the placebo test in the same subjects. This absence of changes was observed even though the supplement elevated carbohydrate mobilization and oxidation (P<0.05), albeit at the expense of lipid mobilization and oxidation (P<0.05). TRUNCATED
Report Number
DCIEM-93-36 —
Date of publication
01 Aug 1993
Number of Pages
30
DSTKIM No
93-03691
CANDIS No
134240
Format(s):
Hardcopy;Originator's fiche received by DSIS

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