Hypohydration and thermoregulation in cold air

Journal of Applied Physiology
C O'BrienM N Sawka

Abstract

This study examined the effects of hypohydration on thermoregulation during cold exposure. In addition, the independent influences of hypohydration-associated hypertonicity and hypovolemia were investigated. Nine male volunteers were monitored for 30 min at 25 degrees C, then for 120 min at 7 degrees C, under three counterbalanced conditions: euhydration (Eu), hypertonic hypohydration (HH), and isotonic hypohydration (IH). Hypohydration was achieved 12 h before cold exposure by inducing sweating (HH) or by ingestion of furosemide (IH). Body weight decrease (4.1 +/- 0.2%) caused by hypohydration was similar for HH and IH, but differences (P < 0.05) were found between HH and IH in plasma osmolality (292 +/- 1 vs. 284 +/- 1 mosmol/kgH2O) and plasma volume reduction (-8 +/- 2 vs. -18 +/- 3%). Heat debt (349 +/- 14 among) did not differ (P > 0.05) among trials. Mean skin temperature decreased throughout cold exposure during Eu but plateaued after 90 min during HH and IH. Forearm-finger temperature gradient tended (P = 0.06) to be greater during Eu (10.0 +/- 0.7 degrees C) than during HH or IH (8.9 +/- 0.7 degrees C). This suggests weaker vasoconstrictor tone during hypohydration than during Eu. Final mean skin temperature was higher...Continue Reading

References

Jan 1, 1977·Annals of the New York Academy of Sciences·D L Costill
Apr 1, 1992·Journal of Applied Physiology·A L VallerandJ H Bittel
Apr 1, 1987·Journal of Applied Physiology·J H Bittel
Aug 1, 1974·Journal of Applied Physiology·D B Dill, D L Costill
Dec 1, 1970·Journal of Applied Physiology·Y Nishi, A P Gagge
Nov 1, 1995·Journal of Applied Physiology·S J MontainM N Sawka

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Citations

Nov 14, 2001·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·J W CastellaniK B Pandolf
Oct 23, 2002·Journal of Applied Physiology·Catherine O'Brien, Scott J Montain
Apr 1, 2003·Canadian Journal of Physiology and Pharmacology·Zhongjie SunRobert Cade
Nov 26, 2008·Journal of Athletic Training·Thomas A CappaertUNKNOWN National Athletic Trainers' Association
Jul 23, 2002·Journal of Applied Physiology·P N AinslieK R Westerterp
Mar 27, 2003·Anesthesiology·Tiberiu EzriDaniel I Sessler
Sep 9, 2004·Medicine and Science in Sports and Exercise·Robert W KenefickJohn W Castellani
Apr 9, 2005·Journal of Applied Physiology·Catherine O'BrienMichael N Sawka
Nov 18, 2010·European Journal of Applied Physiology·Matthew D MullerEllen L Glickman
Apr 29, 2010·The Physician and Sportsmedicine·Kristin J Stuempfle
Oct 24, 2013·European Journal of Applied Physiology·Brett R ElyMichael N Sawka
Jul 19, 2005·Journal of Applied Physiology·Samuel N CheuvrontMichael N Sawka
Sep 23, 2011·Journal of Occupational and Environmental Hygiene·Catherine O'BrienReed W Hoyt
Feb 14, 2016·British Medical Bulletin·Kieran HeilAlexander Wood
Sep 2, 2008·European Journal of Applied Physiology·Robert William KenefickJ W Castellani
Dec 14, 2011·Journal of Sports Sciences·Nanna L MeyerChristine Helle
Oct 28, 2018·Journal of the Royal Army Medical Corps·James A KuhtS Hollis
Jan 25, 2013·The American Journal of Clinical Nutrition·Samuel N CheuvrontMichael N Sawka
Jan 29, 2019·Frontiers in Physiology·Daniela ChlíbkováJosef Bednář
Nov 11, 2006·Medicine and Science in Sports and Exercise·John W CastellaniUNKNOWN American College of Sports Medicine
Aug 13, 1999·The American Journal of Physiology·D S MoranK B Pandolf
Jan 16, 2007·Medicine and Science in Sports and Exercise·Megan N HawkinsBenjamin D Levine
Apr 3, 2001·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·M N SawkaW A Latzka
Aug 18, 2021·Journal of Human Kinetics·Dirk AerenhoutsEvert Zinzen
Nov 10, 2021·Current Sports Medicine Reports·John W CastellaniMichael J Tipton

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