Informative Value of Changes in Hand Skin Temperature in Response to Hypoxic Exposure

Maksimov, A. L.

doi:10.1007/s10747-005-0054-8

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…Comparison of temperatures at these sites with T fing as a potential feedback index for regulating the inlet water temperature in the LCWG to stabilize the thermal balance of the body strongly suggests the superiority of T fing . As was revealed earlier [20], in assessment of temperature changes in the human body not only under heat but also under hypoxic and hypercapnic exposures, hand phalanges differ in providing information for controlling the personal functional state. Taking this into account, we intend to assess the informativeness of T fing measured at different sites of fingers in cold and hot environments, especially, during physical exertion.…”

Section: Discussionmentioning

confidence: 82%

Informative Value of Temperatures in Different Areas of the Human Body for Correcting Body Thermal Imbalance during Extravehicular Activities

et al. 2005

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Identification of noninvasive and informative sites on the body reflecting the development of body thermal imbalance during extravehicular activities (EVAs) is highly important for enhancing astronaut safety. Temperature changes were evaluated on several areas of the head (the mastoid fossa ( T mf ), the forehead ( T fo ), and the cheek ( T ch )) and on the fingers ( T fing ). Subjects were dressed in a multicompartment liquid cooling/warming garment. Studies I and II consisted of different combinations of hood versus garment cooling or warming imposed across stages; studies III and IV involved sagittally divided cooling or warming regimes with the hood worn (study III) or with the head uncovered (study IV). In studies I and II, T mf significantly ( P < 0.05) differed between stages 2, when the head was cooled and the rest of the body heated, and 3, when the head was heated and the rest of the body cooled. The T mf changes were consistent with the thermal conditions imposed on the head but not reflective of the developing body heat deficit. In study III, the T mf at stages 2 and 3 on the right or the left followed the thermal conditions on the ipsilateral side of the body ( P < 0.01). In study IV, T fing showed no significant differences across stages. In studies I-IV, T fing showed consistent changes across stages ( P < 0.05), reflecting the developing body heat deficit. In all studies, there were no significant differences in rectal temperature ( T re ) across stages. T mf and temperatures at other head skin sites did not respond in accordance with the actual intensity of a heat or cold flux from the garment and were not reflective of the overall development of body thermal imbalance. T fing was a more adequate indicator of initial thermal destabilization and provided information that would be useful for monitoring the thermal balance and comfort during EVAs.

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Section: Discussionmentioning

confidence: 82%

Informative Value of Temperatures in Different Areas of the Human Body for Correcting Body Thermal Imbalance during Extravehicular Activities

et al. 2005

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“…Immediately prior to the test, we used a portable gas analyzer manufactured by "Karbonik" to determine the content of CO 2 (%) and O 2 (%) in the subjects' exhaled air. To carry out the test, the subject, with the nose closed with a clip, had to make three deep exhalations in a plastic sealed bag (such as Douglas) from where the process of inhalation and exhalation was further performed with a total duration of three minutes [8]. After completion of the test with return breathing, the gas mixture remained in the sealed bag was analyzed on the percentage level of CO 2 and O 2 using the same instrument.…”

Section: Study Of Gas Exchange Indicatorsmentioning

confidence: 99%

Cardiohemodynamics and gas analysis rearrangements in response to re-breathing in young males of Russia’s Fareast

Averyanova¹

2020

Russ Open Med J

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The objective of this study was to examine the changes occurred in the heart rate variability, cardiovascular system and gas analysis in response to the test with return breathing in young Caucasian and Native men residing in Magadan region and Chukotka Autonomous District. Methods — Total 345 young men were examined; of them 65 were Native people from Chukotka Autonomous District (ChAD) and 35 Natives from Magadan Region (MR) as well as Caucasians (48 from ChAD and 197 from MR, respectively). Results — Studies have shown that in response to the hypoxic-hypercapnic effect, there were changes in the cardiovascular system, heart rate and gas analysis, with a number of differences depending on ethnicity and the region of residence. Region-related features of cardiohemodynamics were manifested by a more pronounced increase in the systolic blood pressure and heart rate in response to the re-breathing test in the two ethnic groups living in ChAD, which was observed against the background of higher values of the difference “baseline-test” in carbon dioxide levels in the exhaled air. Ethnic differences in our studies were seen due to the pronounced increase in response to the test for the activity of the parasympathetic link of the autonomic nervous system (increased TP and HF), at the background of a decrease in VLF observed only among Caucasians, which was associated with the lowest oxygen concentration in the exhaled air at the peak of the test. It was found that the significant differences in gas analysis identified at rest and at the peak of the test as well as rearrangements of the heart rate and cardiovascular system characteristics in response to the re-breathing in the young subjects residing in different regions of northeast Russia and belonging to different ethnic groups can serve as informative criteria reflecting the region caused ethnic characteristics of the organism. Conclusion — It was found, the most visible and informative parameters for the differences in dynamics of the studied systems demonstrated by the subjects of the two ethnic groups in the two observed regions of the Far East in response to a hypoxic-hypercapnic test with return breathing have been the spectral characteristics of the heart rate (TP, HF, VLF) and gas analysis with the calculation of the difference between the baseline and the peak values (difference in the CO2 and O2 concentration of the test-baseline).

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“…During the test, each subject made three deepest possible exhalations into the Douglas type bag. Further breathing was performed from that sealed bag for three minutes with the nose closed with a clip [12]. After the test completion, the gas mixture left in the bag was analyzed for the CO 2 and O 2 percentage amount.…”

Section: Introductionmentioning

confidence: 99%

Gas exchange readjustments in response to hypoxia and hypercapnia exposure in Magadan region military service draftees

Averyanova¹,

Vdovenko²

2022

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Our study identified gas exchange and external respiration characteristics during hypoxia and hypercapnia exposure in young men of the Magadan Region. Materials and methods. A comprehensive survey in young men of military age, 18-21 yr., permanent residents of the Russia’s Northeast, was conducted. A hypoxic-&-hypercapnic respiration test with no CO2 absorption was used. Before and after respiration, using indirect calorimetry method, we analyzed gas composition in exhaled air, external respiration variables, body energy expenditure at rest, respiratory quotient, ventilation equivalents for oxygen and carbon dioxide (Carbonic gas analyzer, Medgraphics VO2000 gas meter). Statistical data processing was performed with Statistica 7.0 package. Results. Significant post-respiratory dynamics in most indicators of gas exchange and external respiration was found. In response to hypoxia and hypercapnia effects, an increase in the energy consumption at rest, in minute volume of body temperature and pressure saturation, in carbon dioxide emission and oxygen consumption per minute was observed with significantly decreased oxygen utilization factor. Conclusion. Effects of hypoxic-&-hypercapnic test can be seen as pronounced readjustments in analyzed variables: intensed metabolism at the test peak and that reduced below baseline in the recovery period. In this case, breathing patterns are readjusted with pronounced increase in pulmonary ventilation and higher values in breathing depth in comparison with the baseline value at each stage of the recovery period, up to its 3rd minute.

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Informative Value of Changes in Hand Skin Temperature in Response to Hypoxic Exposure

Cited by 5 publications

References 3 publications

Informative Value of Temperatures in Different Areas of the Human Body for Correcting Body Thermal Imbalance during Extravehicular Activities

Informative Value of Temperatures in Different Areas of the Human Body for Correcting Body Thermal Imbalance during Extravehicular Activities

Cardiohemodynamics and gas analysis rearrangements in response to re-breathing in young males of Russia’s Fareast

Gas exchange readjustments in response to hypoxia and hypercapnia exposure in Magadan region military service draftees

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