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Save Energy to Burn More Calories. Decreasing the Environment Temperature to 19°C and Burn 6% More Calories at Rest

On the northern hemisphere, the days get shorter and the temperatures are falling. I hope you have not turned up your heatings, yet. It is not only the environment that may benefit from a more conscious management of the room temperature. As scientists from the Clinical Endocrinology Branch, NIDDK-NIH, Bethesda have found, reducing room temperature by 6°C (from 24°C to 19°C) will increase human energy expenditure (EE) be 6%! Exposure to 19° C resulted in an increase in plasma and urine norepinephrine levels (p<0.0001), and a 5.96 % (p<0.001) increase in energy expenditure without significant changes in spontaneous physical activity . Exposure to the lower temperature resulted in a significant increase in free fatty acid levels (p<0.01), fasting insulin levels (p<0.05), and a marginal decrease in postprandial glucose levels. A small but significant (p<0.002) increase in serum free T4 and urinary free cortisol (p<0.05) were observed at 19° C. This is of part...

Exercising in Warm Environment is More Stressing As Measured by Cortisol And TNFα

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As Hosick et.al. found ( Hosick, 2010 ) the exaggerated core temperature response to exercise in warm water environment triggers a significant increase in cortisol and TNFα , both parameters of increased metabolic stress in the 8 male subjects (men age 24y) who participated in "two 40 min trials of cycle ergometry at 65% of VO 2 peak immersed to chest level in cool (25 °C) and warm (38.5 °C) water". Cortisol & TNF-alpha values for subjects before and after 40min exercise immersed in cool or warm water ( Hosick, 2010 ) With a score of 16 (warm ) vs. 16 (cool) the rating of perceived exertion (Borg scale 6-20) was also significantly elevated and correlated with the heart rate (180BPM, warm vs. 144BPM, cool) of the subjects. The researchers conclude that: "[...] this finding is of importance to individuals, coaches, and fitness professionals attempting to understand ideal training load and design in warm or hot environments." ( Hosick, 2010 ) Just another...
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