Effect of dehydration on hypothalamic control of evaporation in the cat - PubMed (original) (raw)
Effect of dehydration on hypothalamic control of evaporation in the cat
M A Baker et al. J Physiol. 1982 Jan.
Abstract
1. Cats were surgically prepared with intracranial thermodes for heating of the hypothalamic thermosensitive area or with venous cannulae for measurement of blood volume and plasma osmolality. They were kept in an environmental chamber in which the ambient temperature was cycled between 25 and 38 degrees C on an 18:6 hr diurnal schedule. 2. Measurements of blood volume and plasma osmolality and of the evaporative response to hypothalamic heating were made during the 38 degrees C phase of the diurnal temperature cycle in animals when they were hydrated ad lib and in the same animals after 72--96 hr of water deprivation. 3. Water deprivation produced a loss of 10% of the body weight, a significant rise in plasma osmolality and a significant fall in blood volume. 4. Hypothalamic heating in hydrated animals generated a highly significant, positive, linear relationship between hypothalamic temperature and evaporative heat loss in every case. 5. In dehydrated animals, the evaporative response to hypothalamic heating was reduced. Rates of evaporation at a given hypothalamic temperature were lower and the slopes of the lines relating evaporative heat loss to hypothalamic temperature were significantly reduced. 6. It is concluded that dehydration reduces the thermal responsiveness of central neural structures controlling evaporation in the cat.
Similar articles
- Control of evaporative heat loss during changes in plasma osmolality in the cat.
Baker MA, Doris PA. Baker MA, et al. J Physiol. 1982 Jul;328:535-45. doi: 10.1113/jphysiol.1982.sp014282. J Physiol. 1982. PMID: 7131325 Free PMC article. - Hypothalamic control of thermoregulation during dehydration.
Doris PA, Baker MA. Doris PA, et al. Brain Res. 1981 Feb 9;206(1):219-22. doi: 10.1016/0006-8993(81)90120-7. Brain Res. 1981. PMID: 7470890 - Vasopressin and the regulation of evaporative water loss and body temperature in the cat.
Doris PA. Doris PA. Brain Res. 1982 Nov 11;251(1):127-36. doi: 10.1016/0006-8993(82)91280-x. Brain Res. 1982. PMID: 7171998 - Thermoregulation and body fluids: role of blood volume and central venous pressure.
Morimoto T. Morimoto T. Jpn J Physiol. 1990;40(2):165-79. doi: 10.2170/jjphysiol.40.165. Jpn J Physiol. 1990. PMID: 2203923 Review. - Exercise, performance and temperature control: temperature regulation during exercise and implications for sports performance and training.
Fortney SM, Vroman NB. Fortney SM, et al. Sports Med. 1985 Jan-Feb;2(1):8-20. doi: 10.2165/00007256-198502010-00002. Sports Med. 1985. PMID: 3883461 Review.
Cited by
- Regulation of Body Temperature by the Nervous System.
Tan CL, Knight ZA. Tan CL, et al. Neuron. 2018 Apr 4;98(1):31-48. doi: 10.1016/j.neuron.2018.02.022. Neuron. 2018. PMID: 29621489 Free PMC article. Review. - Body water conservation through selective brain cooling by the carotid rete: a physiological feature for surviving climate change?
Strauss WM, Hetem RS, Mitchell D, Maloney SK, O'Brien HD, Meyer LCR, Fuller A. Strauss WM, et al. Conserv Physiol. 2017 Feb 14;5(1):cow078. doi: 10.1093/conphys/cow078. eCollection 2017. Conserv Physiol. 2017. PMID: 29383253 Free PMC article. - Plasma hyperosmolality attenuates skin sympathetic nerve activity during passive heat stress in humans.
Gagnon D, Romero SA, Ngo H, Poh PY, Crandall CG. Gagnon D, et al. J Physiol. 2016 Jan 15;594(2):497-506. doi: 10.1113/JP271497. Epub 2015 Dec 14. J Physiol. 2016. PMID: 26525164 Free PMC article. - Dehydration, with and without heat, in kangaroos from mesic and arid habitats: different thermal responses including varying patterns in heterothermy in the field and laboratory.
Dawson TJ, Blaney CE, McCarron HC, Maloney SK. Dawson TJ, et al. J Comp Physiol B. 2007 Oct;177(7):797-807. doi: 10.1007/s00360-007-0176-1. Epub 2007 Jun 29. J Comp Physiol B. 2007. PMID: 17605014 - Human thermoregulatory function during exercise and immersion after 35 days of horizontal bed-rest and recovery.
Mekjavic IB, Golja P, Tipton MJ, Eiken O. Mekjavic IB, et al. Eur J Appl Physiol. 2005 Oct;95(2-3):163-71. doi: 10.1007/s00421-005-1348-x. Epub 2005 Jul 20. Eur J Appl Physiol. 2005. PMID: 16032421
References
- J Appl Physiol. 1966 May;21(3):1004-12 - PubMed
- J Appl Physiol. 1968 Apr;24(4):577-9 - PubMed
- J Appl Physiol. 1968 Aug;25(2):149-52 - PubMed
- Am J Physiol. 1970 Jun;218(6):1575-82 - PubMed
- Am J Physiol. 1970 Oct;219(4):1136-9 - PubMed
Publication types
MeSH terms
LinkOut - more resources
Full Text Sources
Other Literature Sources
Miscellaneous