Introduction In chronobiology studies, the circadian rhythm of core body temperature has often been monitored via rectal temperature recordings. Compliance with rectal recordings, however, limits voluntary participation and prevents a broader spectrum of investigations. With the progress of technology, systems have been developed which allow a measurement of the core body temperature from an intact skin surface, such as the Double Sensor [1], a skin surface temperature and heat-flux combining device. Studies regarding how well such systems reflect the circadian rhythm of core body temperature, however, are lacking. Material & Methods As part of the 2nd Berlin BedRest Study (BBR2-2), subjects underwent micro-g simulated conditions, i.e. 6° headdown tilt bed-rest. On bed-rest day 49, 24 hours temperature profiles were obtained in seven healthy men by a single skin surface temperature sensor and the Double Sensor, each placed at forehead (Tfhd, DSfhd) and sternum (Tste, DSste), and by a rectal probe (Trec). The degree of parallelism between measured temperature variables was assessed by calculating the Pearson correlation coefficient r. Rhythm characteristics determined by fitting a single cosine curve included MESOR, amplitude, and acrophase, and were statistically tested for significance by Student's paired t-test. Results Averaged value (± SD) of Pearson’s r was .867 (.059), .797 (.097), .519 (.373), -.021 (.549) for correlation between Trec with DSfhd, Tfhd, DSste, and Tste, respectively. The correlation mean demonstrated a good parallelism between Trec and temperatures obtained from the forehead. Regarding the rhythm parameters MESOR, amplitude, and acrophase, no significant difference was found between Trec and DSfhd, but between Tfhd and DSfhd as well as between Tfhd and Trec. Discussion & Conclusions Not the skin surface temperature recordings, but the temperatures of the Double Sensor from the forehead seem promising for determining the circadian rhythm of core body temperature in occupational and environmental medicine on earth and space, where the use of rectal probes is not feasible or desired.

Comparison of double sensor, skin, and rectal temperature recordings for determining circadian rhythm / S. Mendt, M. Steinach, H.C. Gunga, O. Opatz, M.A. Maggioni, A. Stahn. ((Intervento presentato al 6. convegno International congress of medicine in space and extreme environments tenutosi a Berlin (Germany) nel 2014.

Comparison of double sensor, skin, and rectal temperature recordings for determining circadian rhythm

M.A. Maggioni;
2014-09

Abstract

Introduction In chronobiology studies, the circadian rhythm of core body temperature has often been monitored via rectal temperature recordings. Compliance with rectal recordings, however, limits voluntary participation and prevents a broader spectrum of investigations. With the progress of technology, systems have been developed which allow a measurement of the core body temperature from an intact skin surface, such as the Double Sensor [1], a skin surface temperature and heat-flux combining device. Studies regarding how well such systems reflect the circadian rhythm of core body temperature, however, are lacking. Material & Methods As part of the 2nd Berlin BedRest Study (BBR2-2), subjects underwent micro-g simulated conditions, i.e. 6° headdown tilt bed-rest. On bed-rest day 49, 24 hours temperature profiles were obtained in seven healthy men by a single skin surface temperature sensor and the Double Sensor, each placed at forehead (Tfhd, DSfhd) and sternum (Tste, DSste), and by a rectal probe (Trec). The degree of parallelism between measured temperature variables was assessed by calculating the Pearson correlation coefficient r. Rhythm characteristics determined by fitting a single cosine curve included MESOR, amplitude, and acrophase, and were statistically tested for significance by Student's paired t-test. Results Averaged value (± SD) of Pearson’s r was .867 (.059), .797 (.097), .519 (.373), -.021 (.549) for correlation between Trec with DSfhd, Tfhd, DSste, and Tste, respectively. The correlation mean demonstrated a good parallelism between Trec and temperatures obtained from the forehead. Regarding the rhythm parameters MESOR, amplitude, and acrophase, no significant difference was found between Trec and DSfhd, but between Tfhd and DSfhd as well as between Tfhd and Trec. Discussion & Conclusions Not the skin surface temperature recordings, but the temperatures of the Double Sensor from the forehead seem promising for determining the circadian rhythm of core body temperature in occupational and environmental medicine on earth and space, where the use of rectal probes is not feasible or desired.
Settore BIO/09 - Fisiologia
European space agency
Deutsches Zentrum für Luft und Raumfahrt
Charitè
Institute of biomedical problems
http://icms2014.de
Comparison of double sensor, skin, and rectal temperature recordings for determining circadian rhythm / S. Mendt, M. Steinach, H.C. Gunga, O. Opatz, M.A. Maggioni, A. Stahn. ((Intervento presentato al 6. convegno International congress of medicine in space and extreme environments tenutosi a Berlin (Germany) nel 2014.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/240157
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