Relevant bibliographies by topics / Thermoneutral immersion

Academic literature on the topic 'Thermoneutral immersion'

Author: Grafiati
Published: 4 June 2021
Last updated: 13 February 2022

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Journal articles on the topic "Thermoneutral immersion"

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Knight, D. R., and S. M. Horvath. "Urinary responses to cold temperature during water immersion." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 248, no. 5 (May 1, 1985): R560—R566. http://dx.doi.org/10.1152/ajpregu.1985.248.5.r560.

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If cold temperature combines with ambient water pressure to stimulate the Henry-Gauer reflex in humans, then free water clearance (CH2O) should be greater during immersion in cold water (29.8 degrees C) than during exposure to cold air (14.8 degrees C) or immersion in thermoneutral water (35 degrees C). Urinary responses to these environments were compared with control measurements made during 6 h of sitting in thermoneutral air (27.6 degrees C). CH2O was not significantly greater in cold water than in the other environments. Rather, the diuretic response was characterized by an increased osmolar clearance (P less than 0.05). Cold temperature and water pressure additively raised urinary output during cold water immersion, with ambient water pressure accounting for two-thirds of the urinary water loss. An elevated rate of sodium excretion (P less than 0.05) began significantly earlier in cold water than in thermoneutral water. This effect of low temperature might have resulted from cold-induced vasoconstriction, since cold temperatures was observed to reduce the foot volume. Sodium excretion was inversely proportional to vital capacity, indicating a responsiveness of the kidney to expansion of the central blood volume. In addition to the effects of water pressure and cold temperature, urinary function was also sensitive to time. The rate of potassium excretion was significantly elevated at min 199 of exposure to all environments. Failure of CH2O to increase above control values indicated that the human diuretic response to cold water immersion is atypical for the Henry-Gauer reflex.
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Boldt, Leif-Hendrik, Waltraud Fraszl, Lothar Röcker, Jörg Christian Schefold, Mathias Steinach, Thilo Noack, and Hanns-Christian Gunga. "Changes in the haemostatic system after thermoneutral and hyperthermic water immersion." European Journal of Applied Physiology 102, no. 5 (November 28, 2007): 547–54. http://dx.doi.org/10.1007/s00421-007-0620-7.

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Hope, Arvid, Leif Aanderud, and Asbjørn Aakvaag. "Dehydration and body fluid-regulating hormones during sweating in warm (38°C) fresh- and seawater immersion." Journal of Applied Physiology 91, no. 4 (October 1, 2001): 1529–34. http://dx.doi.org/10.1152/jappl.2001.91.4.1529.

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Body weight (BW) reductions of more than 4 kg have been observed during diving with the open hot water suit, a technique in which heated seawater (SW) continuously floods the skin surface. To test the hypothesis that osmotic effects may be involved in these fluid-loss processes, head-out immersion experiments in 38°C freshwater (FW) and SW for 4 h were performed. Average BW reduction was 2.5 and 1.9 kg in SW and FW head-out immersion, respectively ( P < 0.01). Atrial natriuretic peptide increased during the first 30 min of SW immersion (5.6–13.4 pmol/l, P < 0.01) followed by a reduction to 7.6 pmol/l ( P < 0.01). This paralleled an initial decrease in aldosterone (from 427 to 306 pmol/l, P < 0.05) followed by an increase to 843 pmol/l ( P < 0.01). The effects of temperature on fluid loss were studied in thermoneutral (34.5°C) and 38°C SW for 2 h. In thermoneutral SW, calculated sweat production was negligible (0.05 kg) compared with 1.2 kg in warm SW. We recommend that, if a dive is planned to last for more than 4 h, a mandatory break for fluid intake should be incorporated in the diving regulations.
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Gaustad, Svein Erik, Alf O. Brubakk, Morten Høydal, Daniele Catalucci, Gianluigi Condorelli, Zeljko Dujic, Jasna Marinovic, Marko Ljubkovic, Andreas Møllerløkken, and Ulrik Wisløff. "Immersion before dry simulated dive reduces cardiomyocyte function and increases mortality after decompression." Journal of Applied Physiology 109, no. 3 (September 2010): 752–57. http://dx.doi.org/10.1152/japplphysiol.01257.2009.

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Diving and decompression performed under immersed conditions have been shown to reduce cardiac function. The mechanisms for these changes are not known. The effect of immersion before a simulated hyperbaric dive on cardiomyocyte function was studied. Twenty-three rats were assigned to four groups: control, 1 h thermoneutral immersion, dry dive, and 1 h thermoneutral immersion before a dive (preimmersion dive). Rats exposed to a dive were compressed to 700 kPa, maintained for 45 min breathing air, and decompressed linearly to the surface at a rate of 50 kPa/min. Postdive, the animals were anesthetized and the right ventricle insonated for bubble detection using ultrasound. Isolation of cardiomyocytes from the left ventricle was performed and studied using an inverted fluorescence microscope with video-based sarcomere spacing. Compared with a dry dive, preimmersion dive significantly increased bubble production and decreased the survival time (bubble grade 1 vs. 5, and survival time 60 vs. 17 min, respectively). Preimmersion dive lead to 18% decreased cardiomyocyte shortening, 20% slower diastolic relengthening, and 22% higher calcium amplitudes compared with controls. The protein levels of the sarco-endoplasmic reticulum calcium ATPase (SERCA2a), Na+/Ca2+ exchanger (NCX), and phospholamban phosphorylation in the left ventricular tissue were significantly reduced after both dry and preimmersion dive compared with control and immersed animals. The data suggest that immersion before a dive results in impaired cardiomyocyte and Ca2+ handling and may be a cellular explanation to reduced cardiac function observed in humans after a dive.
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Wada, F., S. Sagawa, K. Miki, K. Nagaya, S. Nakamitsu, K. Shiraki, and J. E. Greenleaf. "Mechanism of thirst attenuation during head-out water immersion in men." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 268, no. 3 (March 1, 1995): R583—R589. http://dx.doi.org/10.1152/ajpregu.1995.268.3.r583.

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The purpose was to determine whether extracellular volume or osmolality was the major contributing factor for reduction of thirst in air and head-out water immersion in hypohydrated subjects. Eight males (19-25 yr) were subjected to thermoneutral immersion and thermoneutral air under two hydration conditions without further drinking: euhydration in water (Eu-H2O) and euhydration in air, and hypohydration in water (Hypo-H2O) and hypohydration in air (3.7% wt loss after exercise in heat). The increased thirst sensation with Hypo-H2O decreased (P < 0.05) within 10 min of immersion and continued thereafter. Mean plasma osmolality (288 +/- 1 mosmol/kgH2O) and sodium (140 +/- 1 meq/l) remained elevated, and plasma volume increased by 4.2 +/- 1.0% (P < 0.05) throughout Hypo-H2O. A sustained increase (P < 0.05) in stroke volume accompanied the prompt and sustained decrease in plasma renin activity and sustained increase (P < 0.05) in plasma atrial natriuretic peptide during Eu-H2O and Hypo-H2O. Plasma vasopressin decreased from 5.3 +/- 0.7 to 2.9 +/- 0.5 pg/ml (P < 0.05) during Hypo-H2O but was unchanged in Eu-H2O. These findings suggest a sustained stimulation of the atrial baroreceptors and reduction of a dipsogenic stimulus without major alterations of extracellular osmolality in Hypo-H2O. Thus it appears that vascular volume-induced stimuli of cardiopulmonary baroreceptors play a more important role than extracellular osmolality in reducing thirst sensations during immersion in hypohydrated subjects.
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Mourot, Laurent, Malika Bouhaddi, Emmanuel Gandelin, Sylvie Cappelle, Gilles Dumoulin, Jean-Pierre Wolf, Jean Denis Rouillon, and Jacques Regnard. "Cardiovascular Autonomic Control During Short-Term Thermoneutral and Cool Head-Out Immersion." Aviation, Space, and Environmental Medicine 79, no. 1 (January 1, 2008): 14–20. http://dx.doi.org/10.3357/asem.2147.2008.

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Garzon, Mauricio, Olivier Dupuy, Laurent Bosquet, Anil Nigam, Alain Steve Comtois, Martin Juneau, and Mathieu Gayda. "Thermoneutral immersion exercise accelerates heart rate recovery: A potential novel training modality." European Journal of Sport Science 17, no. 3 (September 6, 2016): 310–16. http://dx.doi.org/10.1080/17461391.2016.1226391.

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Reed, Emma L., Morgan L. Worley, Nathan J. Klaes, Jacqueline C. Dirr, Dziana Vertsiakhouskaya, Manjoyt Sandhur, Zachary J. Schlader, and Blair D. Johnson. "The Effects Of Acute Thermoneutral And Hot Water Immersion On Cerebrovascular Reactivity." Medicine & Science in Sports & Exercise 52, no. 7S (July 2020): 973. http://dx.doi.org/10.1249/01.mss.0000686152.05282.42.

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Marmura, Hana, and Matthew Palmer. "Exercise Recovery with Cold and Thermoneutral Water Immersion and Performance in Athletes." Medicine & Science in Sports & Exercise 51, Supplement (June 2019): 648. http://dx.doi.org/10.1249/01.mss.0000562435.69398.54.

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Coulange, Mathieu, Florence Riera, Bruno Melin, Stephane Delliaux, Nathalie Kipson, Chantal Gimenez, Claude Robinet, and Yves Jammes. "Consequences of prolonged total thermoneutral immersion on muscle performance and EMG activity." Pflügers Archiv - European Journal of Physiology 455, no. 5 (October 2, 2007): 903–11. http://dx.doi.org/10.1007/s00424-007-0335-y.

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Dissertations / Theses on the topic "Thermoneutral immersion"

1

Gordon, Christopher, and res cand@acu edu au. "Hydrostatic and thermal influences on intravascular volume determination during immersion: quantification of the f-cell ratio." Australian Catholic University. School of Exercise Science, 2001. http://dlibrary.acu.edu.au/digitaltheses/public/adt-acuvp4.14072005.

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Previous data have shown that the most prevalent, indirect plasma volume (PV) measurement technique, which utilises changes in haematocrit (Hct) and haemoglobin concentration ([Hb]), underestimates actual PV changes during immersion, when compared to a direct tracer-dilution method. An increase in the F-cell ratio (whole-body haematocrit (Hctw) to large-vessel haematocrit (Hctv) ratio) has been purported as a possible explanation, probably due to hydrostatic and thermally-mediated changes during water immersion. Previous investigators have not quantified the F-cell ratio during immersion. Therefore, this study sought to determine the effect of the F-cell ratio on the indirect method during both, thermoneutral and cold-water immersions. Seven healthy males were tested three times, seated upright in air (control: 21.2°C SD ±1.1), and during thermoneutral (34.5oC SD ±0.2) and cold-water immersion (18.6oC SD ±0.2), immersed to the third intercostal space for 60 min. Measurements during the immersion tests included PV (Evans blue dye column elution, Evans blue dye computer programme, and Hct [Hb]), red cell volume (RCV; sodium radiochromate), cardiac frequency (fc) and rectal temperature (Tre). Plasma volume during the control trial remained stable, and equivalent across the three tests. There was a hydrostatically-induced increase in PV during thermoneutral immersion, when determined by the Evans blue dye method (16.2%). However, the Hct/[Hb] calculation did not adequately reflect this change, and underestimated the relative PV change by 43%. In contrast, PV decreased during cold immersion when determined using the Evans blue dye method by 17.9% and the Hct/[Hb] calculation by 8.0%, respectively, representing a 52% underestimation by the latter method. There was a non-significant decline in RCV during both immersions. Furthermore, an increase (8.6%) and decrease (-14.4%) in blood volume (BV) was observed during thermoneutral and cold-water immersions, respectively. The decline in RCV during thermoneutral immersion attenuated the BV expansion. Despite the disparity between the PV methods, there was no increase in the F-cell ratio during either immersion. In contrast, there was a significant decline in the F-cell ratio during the control: air and thermoneutral immersion, which may indicate that other, undefined variables may impact on the stability of the red cell compartment. The current study is the first to show that the Hct/[Hb] method clearly underestimates PV changes during both thermoneutral and cold-water immersion. Furthermore, RCV was shown, for the first time, to decline during both immersions. However, the changes in the F-cell ratio during this study, did not account for the underestimation of PV change using the Hct/[Hb] method.
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Meuche, Sabine [Verfasser]. "Flüssigkeitshaushalt unter besonderer Berücksichtigung der Flüssigkeitsbilanzen und NT-proBNP vor, während und nach thermoneutraler Immersion / Sabine Meuche." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2009. http://d-nb.info/1023579618/34.

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Spyropoulos, Alexios [Verfasser], Orhan [Verfasser] Tapkiran, and Matthias [Akademischer Betreuer] Fink. "Auswirkungen thermoneutraler Ganzkörper-Immersion auf die Befindlichkeit von Patienten mit Depressionen und/ oder Angststörungen / Alexios Spyropoulos und Orhan Tapkiran. Klinik für Rehabilitationsmedizin der Medizinischen Hochschule Hannover. Betreuer: Matthias Fink." Hannover : Bibliothek der Medizinischen Hochschule Hannover, 2012. http://d-nb.info/1027134149/34.

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