Radiant and convective heat loss from the new‐born pig

Mount, L. E.

doi:10.1113/jphysiol.1964.sp007445

Cited by 35 publications

(18 citation statements)

References 12 publications

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“…BR0 IWN, G. LIVrE.SEY AND M. J. DA L WXCEYI loss. By restricting movement, an animal can adopt a cold-defensive posture and thus decrease its effective surface area for convective and radiant heat transfer (Mount, 1964). Although animals moved less at the lower temperature, movementinduced thermogenesis was similar in the two groups, whether expressed on the basis of body weight, metabolic body size or per animal.…”

Section: <0*01mentioning

confidence: 80%

Influence of mild cold on the components of 24 hour thermogenesis in rats.

Brown

Livesey

Dauncey

1991

The Journal of Physiology

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SUMMARY1. The influence of two weeks' acclimation to either 28°C (thermal neutrality) or 21°C (mild cold) on 24 h heat production and motor activity has been investigated in male Wistar rats. Food intake was controlled and provided as a single meal of approximately 170 kJ per day. Mathematical modelling was used to relate metabolic rate to measured movement and time of day.2. For animals at thermal neutrality it was clear that metabolic rate increased during periods of substantial measured movement and returned to baseline during periods of minimal activity. Total heat production could therefore be divided into two components: underlying and movement-induced thermogenesis.3. At 21°C, a more complex model was needed. During periods of substantial activity, the relation between metabolic rate and movement was similar to that at 28°C and total heat production could be divided into the same two components of underlying and movement-induced thermogenesis. However, during periods of prolonged inactivity, a different model was required, which included a component of extra metabolic activity, termed supplementary thermogenesis. By fitting this model to data at 28 and 21°C, it was possible to partition 24 h heat production into the three possible sources of underlying, movement-induced and supplementary thermogenesis.4. Total 24 h heat production was approximately 25% higher for rats at 21 compared with 28°C (P < 0-01) and underlying thermogenesis was approximately 20 % higher for those in the mild cold (P < 00 1). Measured movement was significantly reduced in the mild cold (P < 0 05) although it was energetically less efficient since there was no difference in movement-induced thermogenesis, which accounted for 18 and 15% of total heat production at 28 and 21°C respectively.

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Section: <0*01mentioning

confidence: 80%

Influence of mild cold on the components of 24 hour thermogenesis in rats.

Brown

Livesey

Dauncey

1991

The Journal of Physiology

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“…The measurements of skin heat flow and skin temperature reported above support this conclusion. Accurate estimates of the radiant: convective partition have not yet been made on the newborn infant, but in the adult Burton and Edholm (1955) calculated on the data established by Winslow, Gagge, and Herrington (1939) that under conditions of low air movement radiation accounts for 55% of the nonevaporative heat loss, while Hardy and Du Bois (1938) found the proportion to be even higher, and Mount (1964) has shown that under these conditions radiant heat exchange is at least as large as convective heat exchange in the newborn pig weighing 1-2 kg. at birth.…”

Section: Clinical Tests and Measurementsmentioning

confidence: 99%

Heat losses from babies in incubators.

Hey¹,

Mount²

1967

Archives of Disease in Childhood

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“…The mean radiant temperature assessed in this way was approximately 1°C below the mean air temperature, and the mean ambient temperature was determined as the mean of these two temperatures, since Mount (1964) demonstrated that radiant and air temperatures are approximately equal in their effects on heat loss under conditions of low air movement. The mean radiant temperature assessed in this way was approximately 1°C below the mean air temperature, and the mean ambient temperature was determined as the mean of these two temperatures, since Mount (1964) demonstrated that radiant and air temperatures are approximately equal in their effects on heat loss under conditions of low air movement.…”

Section: Mean Ambient Temperaturementioning

confidence: 99%

Heat losses from young pigs at three environmental temperatures, measured in a direct calorimeter

Holmes

1968

Anim. Sci.

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HOLMES and investigated the effects of several environmental conditions on the heat losses and growth of groups of young pigs, using a direct calorimeter (Mount, Holmes, Start and Legge, 1967). The purpose of the work to be described in this paper was to measure heat losses from young pigs under conditions similar to those used in the previous work except that in this case measurements were made on individual animals. An additional feature of the present experiments was that evaporative and non-evaporative heat losses from the pigs were measured separately.

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Radiant and convective heat loss from the new‐born pig

Cited by 35 publications

References 12 publications

Influence of mild cold on the components of 24 hour thermogenesis in rats.

Influence of mild cold on the components of 24 hour thermogenesis in rats.

Heat losses from babies in incubators.

Heat losses from young pigs at three environmental temperatures, measured in a direct calorimeter

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