Real-time technique for conversion of skin temperature into skin blood flow: human skin as a low-pass filter for thermal waves

Sagaidachnyi, A. A.; Fomin, A. V.; Усанов, Д. А.; Skripal, A. V.

doi:10.1080/10255842.2019.1615058

Cited by 16 publications

(7 citation statements)

References 34 publications

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“…the Tc and PP responses to the CPT in Figure 5 or compare the time shifts between their minima in Figures 8f and 9). The same effects have been observed both in vivo [67] and in simulations [68], [69], which showed a time delay of 180 s in BF-related Tc changes. Considering the heat transfer from the vascular bed towards the skin surface as a wave process, recent modelling work established theoretical relationships for the frequency dependence of the phase delay and amplitude attenuation in Tc with respect to BF over the endothelial and neurogenic frequency bands [12].…”

Section: Discussionsupporting

confidence: 79%

Non-Contact Assessment of Peripheral Artery Haemodynamics Using Infrared Video Thermography

Jorge

Harford

Villarroel

et al. 2021

IEEE Trans. Biomed. Eng.

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Section: Discussionsupporting

confidence: 79%

Non-Contact Assessment of Peripheral Artery Haemodynamics Using Infrared Video Thermography

Jorge

Harford

Villarroel

et al. 2021

IEEE Trans. Biomed. Eng.

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“…Using indirect measures, such as peripheral temperature and derivatives, to infer peripheral perfusion is not a novel approach (examples primarily from the seabird literature, e.g. [ 140 , 141 , 158–160 ]) and even has diagnostic potential in biomedical applications [ 161 ]. Unlike the skin surface, blubber is not directly affected by external influences, such as convective heat loss from water flow.…”

Section: Considerations For Future Progress In the Fieldmentioning

confidence: 99%

Advances in thermal physiology of diving marine mammals: The dual role of peripheral perfusion

Favilla

Horning²,

Costa

2021

Temperature

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The ability to maintain a high core body temperature is a defining characteristic of all mammals, yet their diverse habitats present disparate thermal challenges that have led to specialized adaptations. Marine mammals inhabit a highly conductive environment. Their thermoregulatory capabilities far exceed our own despite having limited avenues of heat transfer. Additionally, marine mammals must balance their thermoregulatory demands with those associated with diving (i.e. oxygen conservation), both of which rely on cardiovascular adjustments. This review presents the progress and novel efforts in investigating marine mammal thermoregulation, with a particular focus on the role of peripheral perfusion. Early studies in marine mammal thermal physiology were primarily performed in the laboratory and provided foundational knowledge through in vivo experiments and ex vivo measurements. However, the ecological relevance of these findings remains unknown because comparable efforts on free-ranging animals have been limited. We demonstrate the utility of biologgers for studying their thermal adaptations in the context in which they evolved. Our preliminary results from freely diving northern elephant seals ( Mirounga angustirostris ) reveal blubber’s dynamic nature and the complex interaction between thermoregulation and the dive response due to the dual role of peripheral perfusion. Further exploring the potential use of biologgers for measuring physiological variables relevant to thermal physiology in other marine mammal species will enhance our understanding of the relative importance of morphology, physiology, and behavior for thermoregulation and overall homeostasis.

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“…It adopted variable size and movable change window for spectrum analysis, which can obtain time-frequency coupling characteristics of data series, and became an effective tool for analyzing time series [67,68]. To eliminate the effect of internal circulation, low-pass filtering [69] was applied to filter out the variability less than two years before wavelet transform of each RH time series.…”

Section: Continuous Wavelet Transform (Cwt)mentioning

confidence: 99%

“…To analyze the main oscillation cycle and corresponding period, continuous wavelet transform of annual mean RH in each subarea was conducted ( Figure 5). To eliminate the effect of internal circulation, low-pass filtering [69] was applied to filter out the variability less than two years before wavelet transform of each time series. Table 4 shows the statistics of significant cycle and the corresponding periods are shown in Figure 5.…”

Section: Continuous Wavelet Transform Analysismentioning

confidence: 99%

Spatiotemporal Variation in Relative Humidity in Guangdong, China, from 1959 to 2017

Liu

Yang

Xing-hu

2020

Water

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Despite the marked influence of relative humidity (RH) on ecosystems and human society, the spatiotemporal pattern of RH is far from clearly understood. This study analyzed the spatiotemporal variation in RH in Guangdong Province, South China, in the period of 1959–2017. The RH data were collected from 74 national standard meteorological stations. The spatiotemporal variation in RH was evaluated using rotate empirical orthogonal function (REOF) zoning, Mann–Kendall test, and wavelet transform methods. Based on the REOF decomposition situation of monthly RH field, Guangdong was divided into six subareas. The annual mean of RH in the whole province was 78.90%. In terms of spatial variation, overall annual mean RH decreased from southwest to northeast in the province. Temporally, annual mean RH showed a declining trend in the last six decades. Particularly, the RH in the Pearl River Delta area declined at the rate of 1.349%/10a. Mann–Kendall tests showed that mutation points of annual mean RH mostly appeared in the 1990s, especially in the early 1990s. Continuous wavelet transforms of annual mean RH displayed that inland subareas have similar cycle characteristics, and the east coast and Pearl River Delta have no significant period in most time domains. The results provide new understanding of RH variation in the last six decades in South China, which is valuable for detecting climate change, monitoring hazardous weather, and predicting future environmental change.

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Real-time technique for conversion of skin temperature into skin blood flow: human skin as a low-pass filter for thermal waves

Cited by 16 publications

References 34 publications

Non-Contact Assessment of Peripheral Artery Haemodynamics Using Infrared Video Thermography

Non-Contact Assessment of Peripheral Artery Haemodynamics Using Infrared Video Thermography

Advances in thermal physiology of diving marine mammals: The dual role of peripheral perfusion

Spatiotemporal Variation in Relative Humidity in Guangdong, China, from 1959 to 2017

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