Effect of behavioral variables on cooling rate of man in cold water

1975 ◽  
Vol 38 (6) ◽  
pp. 1073-1077 ◽  
Author(s):  
J. S. Hayward ◽  
J. D. Eckerson ◽  
M. L. Collis
Keyword(s):  
Body Size ◽  
Cooling Rate ◽  
Rectal Temperature ◽  
Body Surface ◽  
Cold Water ◽  
The Other ◽  
Ocean Water ◽  
Protective Behaviors ◽  
Control Behavior ◽  
Behavioral Variables

Five different behaviors of man while in cold ocean water (9–10 degrees C) were assessed for their effect on rate of progress into hypothermia. With subjects wearing lifejackets, two thermally protective behaviors were studied which reduce exposure to the water of areas of body surface with high relative heat loss potential. One was huddling of three persons and the other a self-huddle behavior (HELP or Heat Escape Lessening Posture). These two behaviors resulted in significant reductions of rectal temperature cooling rate of 66 per cent and 69 per cent, respectively, of that of a control behavior. With no flotation available, two survival swimming behaviors (treading water and drownproofing) were shown to result in significant increases in cooling rate to 134 per cent and 182 per cent, respectively, of the control behavior. Potential swimming distance of subjects wearing a life-jacket was 0.85 miles in water near 12 degrees C before predicted incapacitation by hypothermia. It was concluded that behavioral variables can be of major importance in determining survival time in cold water through modulation of cooling rate associated with other variables such as fatness, body size, and clothing.

scholarly journals Physiologic and Perceptual Responses to Cold-Shower Cooling After Exercise-Induced Hyperthermia

2016 ◽  
Vol 51 (3) ◽  
pp. 252-257 ◽  
Author(s):  
Cory L. Butts ◽  
Brendon P. McDermott ◽  
Brian J. Buening ◽  
Jeffrey A. Bonacci ◽  
Matthew S. Ganio ◽  
...  
Keyword(s):  
Heart Rate ◽  
Cooling Rate ◽  
Rectal Temperature ◽  
Muscle Pain ◽  
Cold Water ◽  
Thermal Sensation ◽  
Water Immersion ◽  
Heat Stroke ◽  
Cold Water Immersion ◽  
Exercise Induced

Exercise conducted in hot, humid environments increases the risk for exertional heat stroke (EHS). The current recommended treatment of EHS is cold-water immersion; however, limitations may require the use of alternative resources such as a cold shower (CS) or dousing with a hose to cool EHS patients.Context: To investigate the cooling effectiveness of a CS after exercise-induced hyperthermia.Objective: Randomized, crossover controlled study.Design: Environmental chamber (temperature = 33.4°C ± 2.1°C; relative humidity = 27.1% ± 1.4%).Setting: Seventeen participants (10 male, 7 female; height = 1.75 ± 0.07 m, body mass = 70.4 ± 8.7 kg, body surface area = 1.85 ± 0.13 m2, age range = 19–35 years) volunteered.Patients or Other Participants: On 2 occasions, participants completed matched-intensity volitional exercise on an ergometer or treadmill to elevate rectal temperature to ≥39°C or until participant fatigue prevented continuation (reaching at least 38.5°C). They were then either treated with a CS (20.8°C ± 0.80°C) or seated in the chamber (control [CON] condition) for 15 minutes.Intervention(s): Rectal temperature, calculated cooling rate, heart rate, and perceptual measures (thermal sensation and perceived muscle pain).Main Outcome Measure(s): The rectal temperature (P = .98), heart rate (P = .85), thermal sensation (P = .69), and muscle pain (P = .31) were not different during exercise for the CS and CON trials (P > .05). Overall, the cooling rate was faster during CS (0.07°C/min ± 0.03°C/min) than during CON (0.04°C/min ± 0.03°C/min; t16 = 2.77, P = .01). Heart-rate changes were greater during CS (45 ± 20 beats per minute) compared with CON (27 ± 10 beats per minute; t16 = 3.32, P = .004). Thermal sensation was reduced to a greater extent with CS than with CON (F3,45 = 41.12, P < .001).Results: Although the CS facilitated cooling rates faster than no treatment, clinicians should continue to advocate for accepted cooling modalities and use CS only if no other validated means of cooling are available.Conclusions:

scholarly journals Human thermoregulatory responses during serial cold-water immersions

1998 ◽  
Vol 85 (1) ◽  
pp. 204-209 ◽  
Author(s):  
John W. Castellani ◽  
Andrew J. Young ◽  
Michael N. Sawka ◽  
Kent B. Pandolf
Keyword(s):  
Body Temperature ◽  
Rectal Temperature ◽  
Heat Production ◽  
Alternative Explanation ◽  
Cold Water ◽  
Metabolic Heat Production ◽  
Normal Body Temperature ◽  
Repeat Trial ◽  
Metabolic Heat ◽  
Made In

This study examined whether serial cold-water immersions over a 10-h period would lead to fatigue of shivering and vasoconstriction. Eight men were immersed (2 h) in 20°C water three times (0700, 1100, and 1500) in 1 day (Repeat). This trial was compared with single immersions (Control) conducted at the same times of day. Before Repeat exposures at 1100 and 1500, rewarming was employed to standardize initial rectal temperature. The following observations were made in the Repeat relative to the Control trial: 1) rectal temperature was lower and heat debt was higher ( P < 0.05) at 1100; 2) metabolic heat production was lower ( P < 0.05) at 1100 and 1500; 3) subjects perceived the Repeat trial as warmer at 1100. These data suggest that repeated cold exposures may impair the ability to maintain normal body temperature because of a blunting of metabolic heat production, perhaps reflecting a fatigue mechanism. An alternative explanation is that shivering habituation develops rapidly during serially repeated cold exposures.

scholarly journals Independent and combined impact of hypoxia and acute inorganic nitrate ingestion on thermoregulatory responses to the cold

2021 ◽  
Vol 121 (4) ◽  
pp. 1207-1218
Author(s):  
Josh T. Arnold ◽  
Stephen J. Bailey ◽  
Simon G. Hodder ◽  
Naoto Fujii ◽  
Alex B. Lloyd
Keyword(s):  
Blood Flow ◽  
Cooling Rate ◽  
Skin Blood Flow ◽  
Rectal Temperature ◽  
Onset Time ◽  
Rate Of Change ◽  
Vascular Control ◽  
Delta Change ◽  
Core Cooling ◽  
The Impact

Abstract Purpose This study assessed the impact of normobaric hypoxia and acute nitrate ingestion on shivering thermogenesis, cutaneous vascular control, and thermometrics in response to cold stress. Method Eleven male volunteers underwent passive cooling at 10 °C air temperature across four conditions: (1) normoxia with placebo ingestion, (2) hypoxia (0.130 FiO2) with placebo ingestion, (3) normoxia with 13 mmol nitrate ingestion, and (4) hypoxia with nitrate ingestion. Physiological metrics were assessed as a rate of change over 45 min to determine heat loss, and at the point of shivering onset to determine the thermogenic thermoeffector threshold. Result Independently, hypoxia expedited shivering onset time (p = 0.05) due to a faster cooling rate as opposed to a change in central thermoeffector thresholds. Specifically, compared to normoxia, hypoxia increased skin blood flow (p = 0.02), leading to an increased core-cooling rate (p = 0.04) and delta change in rectal temperature (p = 0.03) over 45 min, yet the same rectal temperature at shivering onset (p = 0.9). Independently, nitrate ingestion delayed shivering onset time (p = 0.01), mediated by a change in central thermoeffector thresholds, independent of changes in peripheral heat exchange. Specifically, compared to placebo ingestion, no difference was observed in skin blood flow (p = 0.5), core-cooling rate (p = 0.5), or delta change in rectal temperature (p = 0.7) over 45 min, while nitrate reduced rectal temperature at shivering onset (p = 0.04). No interaction was observed between hypoxia and nitrate ingestion. Conclusion These data improve our understanding of how hypoxia and nitric oxide modulate cold thermoregulation.

scholarly journals PSV-7 Effects of drying and oxygenation of piglets at birth on rectal temperatures in the early post-natal period

2020 ◽  
Vol 98 (Supplement_3) ◽  
pp. 154-155
Author(s):  
Katherine Vande Pol ◽  
Naomi Cooper ◽  
Andres Tolosa ◽  
Michael Ellis ◽  
Richard Gates ◽  
...  
Keyword(s):  
Statistical Model ◽  
Birth Control ◽  
Rectal Temperature ◽  
Treatment Time ◽  
The Other ◽  
Experimental Unit ◽  
Potential Treatment ◽  
Temperature Changes ◽  
Oxygen Treatment ◽  
Birth Data

Abstract Piglets often experience hypothermia early after birth. Previous research has suggested that drying piglets and administration of oxygen (a potential treatment for asphyxiation) at birth may increase post-natal rectal temperatures. The objective of this study was to determine the effects of drying and administering oxygen at birth on piglet rectal temperature over the first 24 h after birth. The study, conducted at a commercial facility, used a CRD with 42 sows/litters randomly allotted at start of farrowing to 3 treatments (applied at birth): Control (no drying or oxygenation); Dried (using a cellulose-based desiccant); Dried+Oxygen [dried and placed in a chamber (40% oxygen) for 20 min]. At birth, piglets were weighed and uniquely identified. Rectal temperature was measured at 0, 20, 30, 45, 60, 120, and 1440 min after birth. Data were analyzed using PROC MIXED of SAS. Litter was the experimental unit; piglet was a subsample of litter. The statistical model included effects of treatment, time of measurement, and the interaction. Both the Dried and Dried+Oxygen treatments had greater (P &lt; 0.05) rectal temperatures than the Control between 20 and 120 min. However, the Dried+Oxygen treatment had lower (P &lt; 0.05) rectal temperatures than the Dried treatment between 20 and 60 minutes. Temperatures at 1440 min were lower (P &lt; 0.05) for the Dried+Oxygen than the other treatments; however, differences were small. In conclusion, drying piglets at birth increased rectal temperatures over the first 2 h after birth. The combination of drying piglets at birth and placement in an oxygen chamber for 20 min was less effective at moderating post-natal temperature changes than drying alone. Further research on piglet oxygenation is necessary to understand the reason for these reduced temperatures, and whether this treatment affects pre-weaning mortality. This research was funded by the National Pork Board.

Developmental pattern of hypercapnic and hypoxic ventilatory responses from childhood to adulthood

1994 ◽  
Vol 76 (1) ◽  
pp. 314-320 ◽  
Author(s):  
C. L. Marcus ◽  
W. B. Glomb ◽  
D. J. Basinski ◽  
S. L. Davidson ◽  
T. G. Keens
Keyword(s):  
Heart Rate ◽  
Body Weight ◽  
Body Size ◽  
Respiratory Rate ◽  
Body Surface ◽  
Vital Capacity ◽  
Developmental Pattern ◽  
Ventilatory Responses ◽  
End Tidal ◽  
Arterial O2 Saturation

The developmental pattern of ventilatory responses, through childhood and puberty into adulthood, is not known. Therefore we studied hypercapnic (HCVR) and hypoxic ventilatory responses (HOVR) in 59 subjects (29 males and 30 females) 4–49 yr of age, of whom 35 were children ( < 18 yr old). There was a significant correlation between HCVR and weight (r = 0.33, P < 0.02), vital capacity (r = 0.30, P < 0.05), and body surface area (r = 0.30, P < 0.05) but not height (r = 0.22, NS). There was no correlation between HOVR and any of the correcting factors. To account for disparities in body size, volume-related results were scaled for body weight. The HCVR corrected for weight (HCVR/WT) decreased with age (r = -0.57, P < 0.001). HCVR/WT was significantly higher in children than in adults (0.056 +/- 0.024 vs. 0.032 +/- 0.015 l.kg-1 x min-1. Torr end-tidal PCO2-1, P < 0.001). The (tidal volume/inspiratory duration)/weight, respiratory rate, and heart rate responses to hypercapnia were increased in the children, and the CO2 threshold was lower (36 +/- 5 vs. 40 +/- 6 Torr, P < 0.05). Similarly, the HOVR corrected for weight (HOVR/WT) decreased with age (r = 0.34, P < 0.05), and HOVR/WT was significantly higher in children than in adults (-0.035 +/- 0.017 vs. -0.024 +/- 0.016 l.kg-1 x min-1.% arterial O2 saturation-1, P < 0.02). The respiratory rate and heart rate responses to hypoxia were increased in the children. We conclude that rebreathing HCVR and HOVR are higher during childhood than during adulthood.

Prince Rupert’s drops

1986 ◽  
Vol 41 (1) ◽  
pp. 1-26 ◽  
Keyword(s):  
Royal Society ◽  
Molten Glass ◽  
Cold Water ◽  
17Th Century ◽  
Glass Beads ◽  
The Other ◽  
Full Report ◽  
Finger Pressure

On 4 March 1660—61 ‘glass bubbles’ were first introduced to a meeting of the Royal Society. According to the minutes, ‘The King sent by Sir Paul Neile five little glass bubbles, two with liquor in them, and the other three solid, in order to have the judgement of the society concerning them’ (1). The Royal Society responded with remarkable celerity: its amanuensis produced some more drops two days later, which ‘succeeded in the same manner with those sent by the king’ (2). A very full report of the experiments performed was given to the Royal Society on 14 August 1661 by the President, Sir Robert Moray (3). As the Royal Society did not at this time have a normal publication series the report was recorded in the Register Book (4) and first published by Merret as an appendix to his translation of Neri’s Art of Glass (5). Henry Oldenburg lent Sir Robert’s account to the French traveller Monconys in 1663 who made his own translation into French of the prescription for making the drops. Monconys published this prescription in the second part of his Voyages (6). The ‘bubbles’— the solid ones, at least— were what were later to be called ‘Prince Rupert’s drops’. (Those said to contain ‘liquor’ could have been something different, but were probably the same containing vacuoles and no actual liquid.) These objects, glass beads with the form of a tear-drop tapering to a fine tail, made (though that was not generally known at the time) by dripping molten glass into cold water, exhibited a paradoxical combination of strength and fragility not without interest to the materials scientist of the present day, and which could not fail to excite the imagination of natural (and not so natural) philosphers of the 17th century. The head withstands hammering on an anvil, or, as a more modern test, squeezing in a vice, indenting its steel jaws, without fracture: yet breaking the tail with finger pressure caused the whole to explode into powder.

scholarly journals Ashinkailepas kermadecensis, a new species of deep-sea scalpelliform barnacle (Thoracica: Eolepadidae) from the Kermadec Islands, southwest Pacific

Zootaxa ◽  
2009 ◽  
Vol 2021 (1) ◽  
pp. 57-65 ◽  
Author(s):  
JOHN S. BUCKERIDGE
Keyword(s):  
New Species ◽  
New Zealand ◽  
Deep Sea ◽  
Cold Water ◽  
The Other ◽  
Cold Seeps ◽  
Central Japan ◽  
Southwest Pacific ◽  
The North ◽  
A New Species

A new deep-sea stalked barnacle, Ashinkailepas kermadecensis sp. nov. has been recovered from a cold-water seep at depths of 1165 metres in the vicinity of the Kermadec Ridge to the northeast of the North Island, New Zealand. There are now two species of Ashinkailepas—the other, Ashinkailepas seepiophila Yamaguchi, Newman & Hashimoto, 2004, occurs in deep, cold seeps off central Japan. As there are two species within Ashinkailepas, formal diagnoses are provided for both taxa.

Water Temperature and Drowning

PEDIATRICS ◽  
1991 ◽  
Vol 87 (5) ◽  
pp. 747-748
Author(s):  
LINDA QUAN ◽  
KIM R. WENTZ
Keyword(s):  
Water Temperature ◽  
Rectal Temperature ◽  
Cold Water ◽  
Puget Sound ◽  
Swimming Pool ◽  
Ambient Temperatures ◽  
Rapid Induction

In Reply.— Dr Nichter et al propose that the normal or mildly impaired survival of five asystolic children in our series was due to the rapid induction of hypothermia by the cold waters of the Puget Sound area. However, we reported that hypothermia (rectal temperature &lt;34°C) was not associated with increased survival. In addition, the data in the Table show that none of these five children experienced cold-water submersions. The ambient temperatures and thus possibly swimming pool temperatures in this temperate area's summers are certainly less warm than Florida's.

Body surface temperature adaptations after ice-cold water immersion in regular winter swimmers

2018 ◽  
Vol 14 (1) ◽  
pp. 87-102 ◽  
Author(s):  
Katarzyna Gruszka ◽  
◽  
Grzegorz Jędrzejewski ◽  
Krzysztof A. Sobiech ◽  
Agnieszka Chwałczyńska ◽  
...  
Keyword(s):  
Surface Temperature ◽  
Body Surface ◽  
Cold Water ◽  
Water Immersion ◽  
Cold Water Immersion ◽  
Temperature Adaptations ◽  
Body Surface Temperature

Cooling rate studies of rocks from two basic dykes

1982 ◽  
Vol 46 (340) ◽  
pp. 387-394 ◽  
Author(s):  
G. M. Corrigan
Keyword(s):  
Crystal Growth ◽  
Cooling Rate ◽  
Incubation Period ◽  
The Other ◽  
Textural Features ◽  
Variable Rate ◽  
Constant Rate ◽  
Loop Technique ◽  
Basaltic Melts ◽  
Cooling Model

SynopsisNucleation and crystal growth of plagioclase have been studied in two basaltic melts by one atmosphere, constant-rate and variable-rate cooling experiments using the wire-loop technique (Donaldson et al., 1975). Constant-rate cooling studies indicate that the length of the incubation period prior to nucleation varies systematically with the degree of supercooling and with the cooling rate. Attempts to determine the rates at which the marginal parts of two dykes (from the Isle of Arran, SW Scotland) cooled, by the attempted reproduction of the natural textural features, in constant-rate cooling experiments suggest that for one of the dykes, plagioclase phenocrysts at the contact could have grown at a cooling rate of approximately 3°C/hour and the groundmass plagioclase laths at faster cooling rates in excess of 10°C/hour. For the other dyke the plagioclase laths in the rocks 0.5 cm from the dyke contact probably grew at rates slower than 2°C/hour. Attempts to validate experimentally the Jaeger (1957) cooling model for the two dykes suggest that the dykes cooled at much slower rates than the theory predicts.

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