Solar radiation and the validity of infrared tympanic temperature during exercise in the heat

We investigated the validity of infrared tympanic temperature (IR-T ty ) during exercise in the heat with variations in solar radiation. Eight healthy males completed stationary cycling trials at 70% peak oxygen uptake until exhaustion in an environmental chamber maintained at 30°C with 50% relative...

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Veröffentlicht in:International journal of biometeorology 2020-01, Vol.64 (1), p.39-45
Hauptverfasser: Otani, Hidenori, Kaya, Mitsuharu, Tamaki, Akira, Hosokawa, Yuri, Lee, Jason K. W.
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creator Otani, Hidenori
Kaya, Mitsuharu
Tamaki, Akira
Hosokawa, Yuri
Lee, Jason K. W.
description We investigated the validity of infrared tympanic temperature (IR-T ty ) during exercise in the heat with variations in solar radiation. Eight healthy males completed stationary cycling trials at 70% peak oxygen uptake until exhaustion in an environmental chamber maintained at 30°C with 50% relative humidity. Three solar radiation conditions, 0, 250 and 500 W/m 2 , were tested using a ceiling-mounted solar simulator (metal-halide lamps) over a 3 × 2 m irradiated area. IR-T ty and rectal temperature (T re ) were similar before and during exercise in each trial ( P  > 0.05). Spearman’s rank correlation coefficient ( r s ) demonstrated very strong (250 W/m 2 , r s  = 0.87) and strong (0 W/m 2 , r s  = 0.73; 500 W/m 2 , r s  = 0.78) correlations between IR-T ty and T re in all trials ( P  
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W.</creator><creatorcontrib>Otani, Hidenori ; Kaya, Mitsuharu ; Tamaki, Akira ; Hosokawa, Yuri ; Lee, Jason K. W.</creatorcontrib><description>We investigated the validity of infrared tympanic temperature (IR-T ty ) during exercise in the heat with variations in solar radiation. Eight healthy males completed stationary cycling trials at 70% peak oxygen uptake until exhaustion in an environmental chamber maintained at 30°C with 50% relative humidity. Three solar radiation conditions, 0, 250 and 500 W/m 2 , were tested using a ceiling-mounted solar simulator (metal-halide lamps) over a 3 × 2 m irradiated area. IR-T ty and rectal temperature (T re ) were similar before and during exercise in each trial ( P  &gt; 0.05). Spearman’s rank correlation coefficient ( r s ) demonstrated very strong (250 W/m 2 , r s  = 0.87) and strong (0 W/m 2 , r s  = 0.73; 500 W/m 2 , r s  = 0.78) correlations between IR-T ty and T re in all trials ( P  &lt; 0.001). A Bland-Altman plot showed that mean differences (SD; 95% limits of agreement; root mean square error) between IR-T ty and T re were − 0.11°C (0.46; − 1.00 to 0.78°C; 0.43 ± 0.16°C) in 0 W/m 2 , − 0.13°C (0.32; − 0.77 to 0.50°C; 0.32 ± 0.10°C) in 250 W/m 2 and − 0.03°C (0.60; − 1.21 to 1.14°C; 0.46 ± 0.27°C) in 500 W/m 2 . A positive correlation was found in 500 W/m 2 ( r s  = 0.51; P  &lt; 0.001) but not in 250 W/m 2 ( r s  = 0.04; P  = 0.762) and 0 W/m 2 ( r s  = 0.04; P  = 0.732), indicating a greater elevation in IR-T ty than T re in 500 W/m 2 . Percentage of target attainment within ± 0.3°C between IR-T ty and T re was higher in 250 W/m 2 (100 ± 0%) than 0 (93 ± 7%) and 500 (90 ± 10%; P  &lt; 0.05) W/m 2 . IR-T ty is acceptable for core temperature monitoring during exercise in the heat when solar radiation is ≤ 500 W/m 2 , and its accuracy increases when solar radiation is 250 W/m 2 under our study conditions.</description><identifier>ISSN: 0020-7128</identifier><identifier>EISSN: 1432-1254</identifier><identifier>DOI: 10.1007/s00484-019-01791-1</identifier><identifier>PMID: 31473810</identifier><language>eng</language><publisher>Berlin/Heidelberg: Springer Berlin Heidelberg</publisher><subject>Animal Physiology ; Biological and Medical Physics ; Biophysics ; Body Temperature ; Body Temperature Regulation ; Correlation coefficient ; Correlation coefficients ; Earth and Environmental Science ; Environment ; Environmental chambers ; Environmental Health ; Exercise ; Exhaustion ; Heat ; Hot Temperature ; Male ; Metal halide lamps ; Metal halides ; Meteorology ; Original Paper ; Oxygen ; Oxygen uptake ; Plant Physiology ; Relative humidity ; Solar radiation ; Solar simulators ; Temperature ; Temperature effects ; Temperature monitoring ; Test chambers</subject><ispartof>International journal of biometeorology, 2020-01, Vol.64 (1), p.39-45</ispartof><rights>ISB 2019</rights><rights>International Journal of Biometeorology is a copyright of Springer, (2019). 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W.</creatorcontrib><title>Solar radiation and the validity of infrared tympanic temperature during exercise in the heat</title><title>International journal of biometeorology</title><addtitle>Int J Biometeorol</addtitle><addtitle>Int J Biometeorol</addtitle><description>We investigated the validity of infrared tympanic temperature (IR-T ty ) during exercise in the heat with variations in solar radiation. Eight healthy males completed stationary cycling trials at 70% peak oxygen uptake until exhaustion in an environmental chamber maintained at 30°C with 50% relative humidity. Three solar radiation conditions, 0, 250 and 500 W/m 2 , were tested using a ceiling-mounted solar simulator (metal-halide lamps) over a 3 × 2 m irradiated area. IR-T ty and rectal temperature (T re ) were similar before and during exercise in each trial ( P  &gt; 0.05). Spearman’s rank correlation coefficient ( r s ) demonstrated very strong (250 W/m 2 , r s  = 0.87) and strong (0 W/m 2 , r s  = 0.73; 500 W/m 2 , r s  = 0.78) correlations between IR-T ty and T re in all trials ( P  &lt; 0.001). A Bland-Altman plot showed that mean differences (SD; 95% limits of agreement; root mean square error) between IR-T ty and T re were − 0.11°C (0.46; − 1.00 to 0.78°C; 0.43 ± 0.16°C) in 0 W/m 2 , − 0.13°C (0.32; − 0.77 to 0.50°C; 0.32 ± 0.10°C) in 250 W/m 2 and − 0.03°C (0.60; − 1.21 to 1.14°C; 0.46 ± 0.27°C) in 500 W/m 2 . A positive correlation was found in 500 W/m 2 ( r s  = 0.51; P  &lt; 0.001) but not in 250 W/m 2 ( r s  = 0.04; P  = 0.762) and 0 W/m 2 ( r s  = 0.04; P  = 0.732), indicating a greater elevation in IR-T ty than T re in 500 W/m 2 . Percentage of target attainment within ± 0.3°C between IR-T ty and T re was higher in 250 W/m 2 (100 ± 0%) than 0 (93 ± 7%) and 500 (90 ± 10%; P  &lt; 0.05) W/m 2 . IR-T ty is acceptable for core temperature monitoring during exercise in the heat when solar radiation is ≤ 500 W/m 2 , and its accuracy increases when solar radiation is 250 W/m 2 under our study conditions.</description><subject>Animal Physiology</subject><subject>Biological and Medical Physics</subject><subject>Biophysics</subject><subject>Body Temperature</subject><subject>Body Temperature Regulation</subject><subject>Correlation coefficient</subject><subject>Correlation coefficients</subject><subject>Earth and Environmental Science</subject><subject>Environment</subject><subject>Environmental chambers</subject><subject>Environmental Health</subject><subject>Exercise</subject><subject>Exhaustion</subject><subject>Heat</subject><subject>Hot Temperature</subject><subject>Male</subject><subject>Metal halide lamps</subject><subject>Metal halides</subject><subject>Meteorology</subject><subject>Original Paper</subject><subject>Oxygen</subject><subject>Oxygen uptake</subject><subject>Plant Physiology</subject><subject>Relative humidity</subject><subject>Solar radiation</subject><subject>Solar simulators</subject><subject>Temperature</subject><subject>Temperature effects</subject><subject>Temperature monitoring</subject><subject>Test chambers</subject><issn>0020-7128</issn><issn>1432-1254</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNp9kE1LxDAQhoMo7rr6BzxIwHM1k6RNe5TFL1jwoB4lTNPUzbLb1qQV99-b_VBvHobA5HnfgYeQc2BXwJi6DozJXCYMijiqgAQOyBik4AnwVB6SMWOcJQp4PiInISxYDOWZOiYjAVKJHNiYvD23S_TUY-Wwd21DsaloP7f0E5eucv2atjV1Te3R2_ixXnXYOEN7u-qsx37wllaDd807tV_WGxdspLcFc4v9KTmqcRns2f6dkNe725fpQzJ7un-c3swSIyX0Sa0yWxpV1Qq5TI0QCAoqU1QGMoPAMl6UcasMcF6molAZIkDKuKkhRZuJCbnc9Xa-_Rhs6PWiHXwTT2rOc8EVK4SMFN9RxrcheFvrzrsV-rUGpjdG9c6ojkb11qiGGLrYVw_lyla_kR-FERA7IHQbD9b_3f6n9hs7hIF4</recordid><startdate>20200101</startdate><enddate>20200101</enddate><creator>Otani, Hidenori</creator><creator>Kaya, Mitsuharu</creator><creator>Tamaki, Akira</creator><creator>Hosokawa, Yuri</creator><creator>Lee, Jason K. 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W.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Solar radiation and the validity of infrared tympanic temperature during exercise in the heat</atitle><jtitle>International journal of biometeorology</jtitle><stitle>Int J Biometeorol</stitle><addtitle>Int J Biometeorol</addtitle><date>2020-01-01</date><risdate>2020</risdate><volume>64</volume><issue>1</issue><spage>39</spage><epage>45</epage><pages>39-45</pages><issn>0020-7128</issn><eissn>1432-1254</eissn><abstract>We investigated the validity of infrared tympanic temperature (IR-T ty ) during exercise in the heat with variations in solar radiation. Eight healthy males completed stationary cycling trials at 70% peak oxygen uptake until exhaustion in an environmental chamber maintained at 30°C with 50% relative humidity. Three solar radiation conditions, 0, 250 and 500 W/m 2 , were tested using a ceiling-mounted solar simulator (metal-halide lamps) over a 3 × 2 m irradiated area. IR-T ty and rectal temperature (T re ) were similar before and during exercise in each trial ( P  &gt; 0.05). Spearman’s rank correlation coefficient ( r s ) demonstrated very strong (250 W/m 2 , r s  = 0.87) and strong (0 W/m 2 , r s  = 0.73; 500 W/m 2 , r s  = 0.78) correlations between IR-T ty and T re in all trials ( P  &lt; 0.001). A Bland-Altman plot showed that mean differences (SD; 95% limits of agreement; root mean square error) between IR-T ty and T re were − 0.11°C (0.46; − 1.00 to 0.78°C; 0.43 ± 0.16°C) in 0 W/m 2 , − 0.13°C (0.32; − 0.77 to 0.50°C; 0.32 ± 0.10°C) in 250 W/m 2 and − 0.03°C (0.60; − 1.21 to 1.14°C; 0.46 ± 0.27°C) in 500 W/m 2 . A positive correlation was found in 500 W/m 2 ( r s  = 0.51; P  &lt; 0.001) but not in 250 W/m 2 ( r s  = 0.04; P  = 0.762) and 0 W/m 2 ( r s  = 0.04; P  = 0.732), indicating a greater elevation in IR-T ty than T re in 500 W/m 2 . Percentage of target attainment within ± 0.3°C between IR-T ty and T re was higher in 250 W/m 2 (100 ± 0%) than 0 (93 ± 7%) and 500 (90 ± 10%; P  &lt; 0.05) W/m 2 . IR-T ty is acceptable for core temperature monitoring during exercise in the heat when solar radiation is ≤ 500 W/m 2 , and its accuracy increases when solar radiation is 250 W/m 2 under our study conditions.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><pmid>31473810</pmid><doi>10.1007/s00484-019-01791-1</doi><tpages>7</tpages><orcidid>https://orcid.org/0000-0001-9138-5361</orcidid><orcidid>https://orcid.org/0000-0001-7737-392X</orcidid></addata></record>
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subjects Animal Physiology
Biological and Medical Physics
Biophysics
Body Temperature
Body Temperature Regulation
Correlation coefficient
Correlation coefficients
Earth and Environmental Science
Environment
Environmental chambers
Environmental Health
Exercise
Exhaustion
Heat
Hot Temperature
Male
Metal halide lamps
Metal halides
Meteorology
Original Paper
Oxygen
Oxygen uptake
Plant Physiology
Relative humidity
Solar radiation
Solar simulators
Temperature
Temperature effects
Temperature monitoring
Test chambers
title Solar radiation and the validity of infrared tympanic temperature during exercise in the heat
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