Calculation of Heat Production From Insensible Loss of Weight 1

Johnston, Margaret Woodwell; Newburgh, L. H.

doi:10.1172/jci101310

Cited by 13 publications

(4 citation statements)

References 10 publications

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“…Caloric expenditure determinations were performed by the technique of Johnson and Newburgh (4). Four pairs of duplicate studies of the model were performed on four different diets.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Studies of the Effect of Dietary Protein and Caloric Levels on the Kinetics of Nitrogen Metabolism Using N15 L-Aspartic Acid

Tschudy¹,

Bacchus²,

Weissman³

et al. 1959

J. Clin. Invest.

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“…Caloric expenditure determinations were performed by the technique of Johnson and Newburgh (4). Four pairs of duplicate studies of the model were performed on four different diets.…”

Section: Methodsmentioning

confidence: 99%

“…Since the liver removes a large fraction of the administered dose of labeled amino acid, it is probable that the values computed from the model are to a large extent a reflection of liver activity. 4 The line graph below the weight curves represents the serum uric acid level and the bar graph, the daily excretion of uric acid.…”

Section: Methodsmentioning

confidence: 99%

Studies of the Effect of Dietary Protein and Caloric Levels on the Kinetics of Nitrogen Metabolism Using N15 L-Aspartic Acid

Tschudy¹,

Bacchus²,

Weissman³

et al. 1959

J. Clin. Invest.

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“…The heat transfer coefficients between the body surface and ambient air and between the tissue and internal air were chosen as 4.1 W m −2 K −1 and 26.0 W m −2 K −1 , respectively. Insensible water loss in the non-pregnant and pregnant woman was estimated at 20 ml kg −1 day −1 on the basis of the proportional relationship with the basal metabolic rate (Margaret et al 1942), namely, for the weight listed in table 1. Insensible water loss in the voxel models of a non-pregnant woman and a pregnant woman is 29 W and 33 W, respectively.…”

Section: Thermal Properties Of the Human Bodymentioning

confidence: 99%

VLADIMIR IOSIFOVICH KONDRASHOV (obituary)

Kudryavtsev¹,

Lizorkin²,

Nikol'skii³

et al. 1972

Russ. Math. Surv.

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This study computationally assessed the temperature elevations due to electromagnetic wave energy deposition during magnetic resonance imaging in non-pregnant and pregnant woman models. We used a thermal model with thermoregulatory response of the human body for our calculations. We also considered the effect of blood temperature variation on body core temperature. In a thermal equilibrium state, the temperature elevations in the intrinsic tissues of the woman and fetal tissues were 0.85 and 0.61 • C, respectively, at a whole-body averaged specific absorption rate of 2.0 W kg −1 , which is the restriction value of the International Electrotechnical Commission for the normal operating mode. As predicted, these values are below the temperature elevation of 1.5 • C that is expected to be teratogenic. However, these values exceeded the recommended temperature elevation limit of 0.5 • C by the International Commission on Non-Ionizing Radiation Protection. We also assessed the irradiation time required for a temperature elevation of 0.5 • C at the aforementioned specific absorption rate. As a result, the calculated irradiation time was 40 min.

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“…Also, the palm and the head had greater regional IBL than the chest or arms [ 13 ]. Furthermore, insensible perspiration is known as a significant index for estimating total heat production of normal adults under a basal state [ 17 ]. Although such anthropological and physiological significance of IBL in human heat exchange, very little information are available concerning relationships to anthropometric characteristics, such as body weight, height, or body surface area.…”

Section: Introductionmentioning

confidence: 99%

Greater body mass index is related to greater self-identified cold tolerance and greater insensible body mass loss

Jung

Kim

Park

et al. 2016

J Physiol Anthropol

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BackgroundInsensible body mass loss (IBL) from the human body continuously occurs, which is an important component in body heat exchange. The purpose of this study was to examine the relevance of IBL to anthropometric characteristics and self-identified thermal tolerance.MethodsA total of 289 healthy young Korean males were chosen and sorted into the following three groups: heat tolerable only (HTO, N = 79), cold tolerable only (CTO, N = 104), neither heat nor cold tolerable (NHC, N = 106). They weighed before and after a 30-min rest under lightly clothed condition at an air temperature of 23 ± 1 °C with a relative humidity 55 ± 5 %RH.Results(1) The IBL of 289 males had a mean of 90 ± 75 g h−1 (48 ± 40 g h−1 m−2); (2) No significant difference in IBL among the three groups were found; (3) Significant differences in body weight and body mass index (BMI) among three groups were found (P < 0.05), but insignificance was found for height (P = 0.726) or body surface area (P = 0.059); (4) CTO was approximately 4.1 kg heavier in body weight (P < 0.05) and higher in BMI (P < 0.01) than in HTO; (5) Only for the group CTO, IBL (g h−1) showed a positive relationship to BMI (P < 0.05, R2 = 0.056), but there was no relationship between IBL and body surface area.ConclusionsFor healthy young males within normal anthropometric ranges in Korea, IBL was positively related to BMI, and individuals with greater BMI showed greater self-identified cold tolerance, but no direct relationship was found between IBL and self-identified cold tolerance. This suggests that body physique (e.g., BMI) could be an explanatory factor between insensible body heat loss and subjective cognition on cold tolerance.

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Calculation of Heat Production From Insensible Loss of Weight 1

Cited by 13 publications

References 10 publications

Studies of the Effect of Dietary Protein and Caloric Levels on the Kinetics of Nitrogen Metabolism Using N15 L-Aspartic Acid

Studies of the Effect of Dietary Protein and Caloric Levels on the Kinetics of Nitrogen Metabolism Using N15 L-Aspartic Acid

VLADIMIR IOSIFOVICH KONDRASHOV (obituary)

Greater body mass index is related to greater self-identified cold tolerance and greater insensible body mass loss

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