A non-invasive device to continuously determine heat strain in humans

Gunga, Hanns‐Christian; Sandsund, Mariann; Reinertsen, Randi Eidsmo; Sattler, Frank A.; Koch, Jochim

doi:10.1016/j.jtherbio.2008.03.004

Cited by 95 publications

(86 citation statements)

References 34 publications

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“…exercising individuals in warm-hot conditions. The earlier investigation, conducted at 33 and 40°C, revealed the insulation largely, but not completely, removed the ambient-to-skin thermal gradient, so an air-temperature bias was evident (Taylor et al, 1999), as confirmed by Gunga et al (2008). The strength of the correlation between sensor and oesophageal temperatures was site dependent, with the forehead being superior to the spine, followed by the wrist and jugular sites.…”

Section: Transcutaneous Temperaturementioning

confidence: 88%

“…Another variation, developed to find a technically less-demanding and more robust method for field use, used clothing insulation and insulated-skin temperature measurements (Dollberg et al, 1993;Bogh et al, 1994;Taylor et al, 1999;Edwards et al, 2002;Armstrong, 2006;Gunga et al, 2008). Those studies yielded inconsistent outcomes that appeared linked to the quality of the thermal insulation and ambient conditions.…”

Section: Transcutaneous Temperaturementioning

confidence: 99%

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Considerations for the measurement of core, skin and mean body temperatures

Taylor

Tipton

Kenny

2014

Journal of Thermal Biology

309

243

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Section: Transcutaneous Temperaturementioning

confidence: 88%

Section: Transcutaneous Temperaturementioning

confidence: 99%

Considerations for the measurement of core, skin and mean body temperatures

Taylor

Tipton

Kenny

2014

Journal of Thermal Biology

309

243

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“…However, the difference in predicted T c by somatic forms was not as discrete as measured values. Based on 0.50°C as the criteria of a maximum acceptable error (Gunga et al 2008), the model predictions of individuals by somatic forms was overall close to the measured values, except for the prediction errors greater than 0.50°C in the 90th minute in data2.…”

Section: Model Validation By Somatic Formsmentioning

confidence: 55%

“…Overall, the model prediction errors were small and lean individuals were able to tolerate 30% longer in the heat stress than medium individuals. Using a criteria of RMSD=0.5°C as a maximum acceptable range (Gunga et al 2008), the model errors (RMSD) were acceptable within the criteria. Figure 4 compares mean T c predictions with mean measured T c of medium and lean groups.…”

Section: Model Validation By Somatic Formsmentioning

confidence: 99%

Female anthropometric variability and their effects on predicted thermoregulatory responses to work in the heat

2011

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The use of thermoregulatory models for assessing physiological responses of workers in thermally stressful situations has been increasing because of the risks and costs related to human studies. In a previous study (Yokota et al. Eur J Appl Physiol 104:297-302, 2008), the effects of anthropometric variability on predicted physiological responses to heat stress in U.S. Army male soldiers were evaluated. Five somatotypes were identified in U.S. Army male multivariate anthropometric distribution. The simulated heat responses, using a thermoregulatory model, were different between somatotypes. The present study further extends this line of research to female soldiers. Anthropometric somatotypes were identified using multivariate analysis [height, weight, percent body fat (%BF)] and the predicted physiological responses to simulated exercise and heat stress using a thermoregulatory model were evaluated. The simulated conditions included walking at ~3 mph (4.8 km/h) for 300 min and wearing battle dress uniform and body armor in a 30°C, 25% relative humidity (RH) environment without solar radiation. Five major somatotypes (tall-fat, tall-lean, average, short-lean, and short-fat), identified through multivariate analysis of anthropometric distributions, showed different tolerance levels to simulated heat stress: lean women were predicted to maintain their core temperatures (T(c)) lower than short-fat or tall-fat women. The measured T(c) of female subjects obtained from two heat studies (data1: 30°C, 32% RH, protective garments, ~225 w·m(-2) walk for 90 min; data2: 32°C, 75% RH, hot weather battle dress uniform, ~378 ± 32 w·m(-2) for 30 min walk/30 min rest cycles for 120 min) were utilized for validation. Validation results agreed with the findings in this study: fat subjects tended to have higher core temperatures than medium individuals (data2) and lean subjects maintained lower core temperatures than medium subjects (data1).

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“…Eine aktuelle Entwicklung zur nichtinvasiven Messung der KKT ist der sogenannte Doppelsensor. Dieser wird an der Stirn platziert und korreliert sehr gut mit der rektalen Temperaturmessung [5,6,7]. …”

Section: Homöothermieunclassified

Wärmeanwendungen unter Berücksichtigung der Wärmeregulation - Teil 1

Pecher

Zeiger²,

Schobersberger

2013

Schweiz Z Ganzheitsmed

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Wärmeanwendungen sind in der Krankheitsprävention und zur Linderung vielfältiger Beschwerden ein fester Bestandteil unserer Kultur. Durch die Fortschritte der Medizin wurden Wärmeanwendungen als therapeutisches Verfahren in Randgebiete verdrängt. Mit dem demographischen Wandel, der Zunahme chronischer und vor allem stoffwechselbedingter Erkrankungen sowie durch den Kostendruck im Gesundheitswesen wächst jedoch das Interesse an diesen Verfahren bei Betroffenen sowie auch in der Medizin. Neben der Konduktion und Konvektion werden im privaten und medizinischen Umfeld radiative Verfahren genutzt. Die Wirkung der Wärmeapplikation ist unabhängig vom Medium mit reflektorischen Reaktionen (Muskelentspannung und Schmerzlinderung) sowie Effekten auf Basis der Durchblutungserhöhung und der Temperaturerhöhung im Gewebe erklärbar. Da Wärme im Körper praktisch ausschliesslich mittels Konvektion über das Blut verteilt werden kann, erklärt sich der Einfluss auf das Herzkreislaufsystem. Unter Berücksichtigung der Wärmeregulationsmechanismen lassen sich drei Prinzipien unterscheiden. Die Wärmeapplikation oberhalb, innerhalb und unterhalb der Thermoneutralzone differieren jeweils hinsichtlich der Herzkreislaufbelastung und der Wärmeverteilung. Mit Wärmeanwendungen sind allerdings auch Gefahren verbunden - vor allem, wenn die Wärmeregulation durch Erkrankungen oder Medikationen auf zentraler oder lokaler Ebene gestört ist. Dies geschieht vor allem in Hinblick auf die Herzkreislaufbelastung und auf thermische Schädigungen der Haut. Daher sind Wärmeapplikationssysteme zu fordern, die den Wärmefluss individuell an die Wärmeaufnahmefähigkeit des Körpers anpassen. Als Regelgrösse kann dazu die kontinuierliche Messung der Hauteigentemperatur genutzt werden, um eine effiziente und sichere Wärmeanwendung zu ermöglichen.

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A non-invasive device to continuously determine heat strain in humans

Cited by 95 publications

References 34 publications

Considerations for the measurement of core, skin and mean body temperatures

Considerations for the measurement of core, skin and mean body temperatures

Female anthropometric variability and their effects on predicted thermoregulatory responses to work in the heat

Wärmeanwendungen unter Berücksichtigung der Wärmeregulation - Teil 1

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