Energy expenditure during sleep in men and women: evaporative and sensible heat losses

A direct calorimeter study involving 59 apparently healthy adults (21 women, 38 men) evaluated the mean value, the within- and between-subject variability, the trend in heat loss, and heat production during sleep. Increased heat loss during sleep was attributed to an increase in evaporative heat los...

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Published inHuman nutrition. Clinical nutrition Vol. 41C; no. 3; pp. 225 - 233
Main Authors Garby, L, Kurzer, M.S, Lammert, O, Nielsen, E
Format Journal Article
LanguageEnglish
Published England 01.05.1987
Subjects
Adolescent
Adult
adults
Body Temperature Regulation
Calorimetry
Circadian Rhythm
energy expenditure
Energy Metabolism
Female
gender differences
heat loss
heat production
Humans
Male
Sex Factors
sleep
Sleep - physiology
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Abstract A direct calorimeter study involving 59 apparently healthy adults (21 women, 38 men) evaluated the mean value, the within- and between-subject variability, the trend in heat loss, and heat production during sleep. Increased heat loss during sleep was attributed to an increase in evaporative heat loss. Heat losses during sleep fell more in men than in women (ca. 30% vs. ca 14%) and approached basal levels during the last hour of sleep. Heat production was estimated in men to be ca. 9% less than heat loss.(wz)
AbstractList A direct calorimeter study involving 59 apparently healthy adults (21 women, 38 men) evaluated the mean value, the within- and between-subject variability, the trend in heat loss, and heat production during sleep. Increased heat loss during sleep was attributed to an increase in evaporative heat loss. Heat losses during sleep fell more in men than in women (ca. 30% vs. ca 14%) and approached basal levels during the last hour of sleep. Heat production was estimated in men to be ca. 9% less than heat loss.(wz)
Evaporative and sensible heat losses were measured during sleep in 38 male and 21 female subjects in a direct whole-body calorimeter (24 m3). The subjects were all apparently healthy, had a mean body weight of 66 kg and had spent the preceding day in the calorimeter performing different fixed physical activity programmes. Heat losses were measured continuously between 11.30 p.m. and 6.30 a.m. The average (+/- s.e.m.) rate of total heat loss during the 7h of sleep was 90.6 +/- 1.21 and 74.4 +/- 1.22 watts for men and women respectively. The total heat loss during basal resting conditions immediately following sleep was 83.8 +/- 1.5 and 69.2 +/- 1.6 watts, respectively. Heat production during basal resting conditions, as measured by indirect calorimetry about 1 h after awakening on the morning of the preceding day, was found to be 85.6 +/- 1.3 and 71.2 +/- 1.1 watts, respectively. The increase in heat loss during sleep above that of basal resting conditions could largely be attributed to an increase in the evaporative heat loss. The heat loss fell during the night by about 14 per cent in women and about 30 per cent in men, approaching basal resting values in the last hour of sleep. Heat production during sleep was calculated for the male subjects by correcting the heat loss data for the published decreases in rectal temperature during the night and was found to be on average 9 per cent lower than the heat loss. The present data, as well as previously reported data, suggest that the energy expenditure of sleep is 0.95 X BMR rather than 1.0 X BMR as reported in the recent FAO/WHO/UNU Expert consultation (1985).
Author Lammert, O
Garby, L
Kurzer, M.S
Nielsen, E
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Snippet A direct calorimeter study involving 59 apparently healthy adults (21 women, 38 men) evaluated the mean value, the within- and between-subject variability, the...
Evaporative and sensible heat losses were measured during sleep in 38 male and 21 female subjects in a direct whole-body calorimeter (24 m3). The subjects were...
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SubjectTerms Adolescent
Adult
adults
Body Temperature Regulation
Calorimetry
Circadian Rhythm
energy expenditure
Energy Metabolism
Female
gender differences
heat loss
heat production
Humans
Male
Sex Factors
sleep
Sleep - physiology
Title Energy expenditure during sleep in men and women: evaporative and sensible heat losses
URI https://www.ncbi.nlm.nih.gov/pubmed/3610667
Volume 41C
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