Influence of Thermoregulatory Vasomotion and Ambient Temperature Variation on the Accuracy of Core-temperature Estimates by Cutaneous Liquid-crystal Thermometers

Ikeda, Takehiko; Sessler, Daniel I.; Marder, Danielle; Xiong, Jing

doi:10.1097/00000542-199703000-00012

Cited by 68 publications

(28 citation statements)

References 47 publications

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“…The forehead Tsk is useful in estimating (Ikeda et al 1997) or monitoring the trends (Allen et al 1990) in core temperature, although there are contradictory results (Patel et al 1996). However, forehead Tsk follows the same circadian rhythm as rectal temperature (Kräuchi and Wirz-Justice 1994), and many studies confirm the important role of the head in thermoregulation (Rasch et al 1991;Brengelmann 1993;Desruelle and Candas 2000).…”

Section: Discussionmentioning

confidence: 99%

Effects of season on sleep and skin temperature in the elderly

Okamoto-Mizuno

Tsuzuki

2009

Int J Biometeorol

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The effects of season on sleep and skin temperature (Tsk) in 19 healthy, elderly volunteers were investigated. Measurements were obtained in summer, winter, and fall, and activity levels were monitored using a wrist actigraph system for five consecutive days. The temperature and humidity of the bedrooms of the subjects' homes were measured continuously for five days. During actigraphic measurement, Tsk during sleep was measured for two nights. The bedroom temperature and humidity significantly increased in summer compared to winter and fall. In summer, the total sleep time decreased (mean +/- SE min; summer, 350.8 +/- 15.7; winter, 426.5 +/- 14.2; fall, 403.2 +/- 16.4) and wakefulness increased (P < 0.003) compared to those in fall or winter. The sleep efficiency index that was derived from wrist actigraphy was significantly decreased (P < 0.001) in summer (81.4 +/- 2.9%) compared with winter (91.6 +/- 1.3%) or fall (90.2 +/- 1.2%). The forehead Tsk significantly increased, while the chest and thigh Tsks were decreased in summer compared to those in fall or winter. These results suggest that, in the elderly, sleep is disturbed in summer more than in other seasons, and that this disturbance is related to fluctuations in Tsk.

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Section: Discussionmentioning

confidence: 99%

Effects of season on sleep and skin temperature in the elderly

Okamoto-Mizuno

Tsuzuki

2009

Int J Biometeorol

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“…Co-integration with electronics provides a means for controlled, local heating by RF signals, to enable not only mapping of temperature but also intrinsic thermal constitutive properties. Uniform layers of TLCs in water-impermeable, non-stretchable thick plastic sheaths, and without electronics, have been explored for skin thermography [26][27][28] but without the ability to conform sufficiently well to the curved, textured surface of the skin for accurate, reproducible measurements. Such devices also frustrate transepidermal water loss.…”

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confidence: 99%

Epidermal photonic devices for quantitative imaging of temperature and thermal transport characteristics of the skin

et al. 2014

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Characterization of temperature and thermal transport properties of the skin can yield important information of relevance to both clinical medicine and basic research in skin physiology. Here we introduce an ultrathin, compliant skin-like, or 'epidermal', photonic device that combines colorimetric temperature indicators with wireless stretchable electronics for thermal measurements when softly laminated on the skin surface. The sensors exploit thermochromic liquid crystals patterned into large-scale, pixelated arrays on thin elastomeric substrates; the electronics provide means for controlled, local heating by radio frequency signals. Algorithms for extracting patterns of colour recorded from these devices with a digital camera and computational tools for relating the results to underlying thermal processes near the skin surface lend quantitative value to the resulting data. Application examples include non-invasive spatial mapping of skin temperature with milli-Kelvin precision ( ± 50 mK) and sub-millimetre spatial resolution. Demonstrations in reactive hyperaemia assessments of blood flow and hydration analysis establish relevance to cardiovascular health and skin care, respectively.

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“…9 Temperature at the rectum also correlates well with core temperature, but fails to follow the rapid change of the temperature. 10 In addition to these temperature monitoring sites, "deep-forehead" and "deep sternal" temperatures measured by the "deep-tissue" thermometer (Coretemp® CTM-205, Terumo corp., Tokyo, Japan) which was developed by Fox 11 and refined by Togawa 12 has been shown to have sufficient accuracy, compared with esophageal temperature.…”

Section: Resultsmentioning

confidence: 95%