Sleep on a high heat capacity mattress increases conductive body heat loss and slow wave sleep

2018 ◽  
Vol 185 ◽  
pp. 23-30 ◽  
Author(s):  
Kurt Kräuchi ◽  
Elisa Fattori ◽  
Alessandra Giordano ◽  
Maria Falbo ◽  
Antonella Iadarola ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Heat Loss ◽  
Slow Wave ◽  
Slow Wave Sleep ◽  
High Heat ◽  
Conductive Body ◽  
High Heat Capacity ◽  
Body Heat

scholarly journals 0015 Manipulating Body Temperature: Effects on Sleep in Postmenopausal Women

SLEEP ◽  
2020 ◽  
Vol 43 (Supplement_1) ◽  
pp. A6-A7
Author(s):  
K J Reid ◽  
K Kräuchi ◽  
D Grimaldi ◽  
J Sbarboro ◽  
H Attarian ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heat Capacity ◽  
Body Temperature ◽  
Postmenopausal Women ◽  
Slow Wave ◽  
Slow Wave Sleep ◽  
Core Body Temperature ◽  
High Heat ◽  
Oscillatory Activity ◽  
High Heat Capacity

Abstract Introduction A decline in sleep quality and reduction in slow wave sleep (SWS) and slow wave activity (SWA) are common in older adults. Prior studies have shown that manipulating body temperature during sleep can increase SWS/SWA. The aim of this study was to determine the effects of manipulation of body temperatures during sleep, using a high heat capacity mattress, on SWS/SWA and heart rate variability in post-menopausal women. Methods Twenty-four healthy postmenopausal women between 40–75 years of age (mean age 62.4 ± 8.2 years, mean BMI 25.4 ± 3.5 kg/m2) were randomized in a single-blind, counterbalanced, cross-over manner to sleep on either a high heat capacity mattress (HHCM) or a low heat capacity mattress(LHCM) a week apart. Sleep was recorded using polysomnography during an 8-hour sleep opportunity. Core and peripheral temperatures were recorded using Equivital and ibutton respectively. Results In comparison to the LHCM, sleep on HHCM exhibited a selective increase in SWS (average increase in Stage N3 of 9.6 minutes (2.1%), p = 0.04) and in slow oscillatory activity (0.5-1Hz) in the first NREM/REM cycle (p=0.04). In addition, the HHCM induced a greater reduction in core body temperature (p=0.002), and delayed the increase in mattress surface temperature (maximal difference LHCM-HHCM: 4.66±0.17°C). Average heart rate was 2.7 beats/minute lower across the night on the HHCM compared to the LHCM (p=0.001). Conclusion The results of this study indicate that manipulation of body temperature during sleep may be a useful approach to enhance SWS sleep and cardiovascular function in postmenopausal women. Support Technogel

scholarly journals Effects of sleep on a high-heat capacity mattress on sleep stages, EEG power spectra, cardiac interbeat intervals and body temperatures in healthy middle-aged men‡

SLEEP ◽  
2019 ◽  
Vol 43 (5) ◽  
Author(s):  
Sebastian Herberger ◽  
Kurt Kräuchi ◽  
Martin Glos ◽  
Katharina Lederer ◽  
Lisa Assmus ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heat Capacity ◽  
Body Temperature ◽  
Wave Energy ◽  
Sleep Stage ◽  
High Heat ◽  
Body Temperatures ◽  
High Heat Capacity ◽  
Eeg Power ◽  
Core Body

Abstract Study Objectives This study deals with the question whether a slow (non-disturbing) reduction of core body temperature (CBT) during sleep increases sleep stage N3 and EEG slow wave energy (SWE) and leads to a slowing of heart rate in humans. Participants Thirty-two healthy male subjects with a mean ± SD age 46 ± 4 years and body mass index 25.2 ± 1.8 kg/m2. Methods A high-heat capacity mattress (HM) was used to lower body temperatures in sleep and was compared to a conventional low-heat capacity mattress (LM) in a double-blinded fashion. Polysomnography was performed accompanied by measurements of skin-, core body- and mattress surface-temperatures, and heart rate. EEG power spectral analyses were carried out using Fast Fourier Transform. Interbeat intervals were derived from the electrocardiogram. Results The HM led to a larger decline in CBT, mediated through higher heat conduction from the core via the proximal back skin onto the mattress together with reduced heart rate. These effects occurred together with a significant increase in sleep stage N3 and standardized slow wave energy (sSWE, 0.791–4.297 Hz) accumulated in NREM sleep. In the 2nd half of the night sSWE increase was significantly correlated with body temperature changes, for example with CBT decline in the same phase. Conclusions A HM subtly decreases CBT, leading to an increased amount of sleep stage N3 and of sSWE, as well as a slowing of heart rate.

scholarly journals Development of core–sheath structured smart nanofibers by coaxial electrospinning for thermo-regulated textiles

RSC Advances ◽  
2019 ◽  
Vol 9 (38) ◽  
pp. 21844-21851 ◽  
Author(s):  
Liqiang Yi ◽  
Yan Wang ◽  
Yini Fang ◽  
Ming Zhang ◽  
Juming Yao ◽  
...  
Keyword(s):  
Heat Capacity ◽  
High Heat ◽  
Coaxial Electrospinning ◽  
High Heat Capacity

Fabrication of core–sheath structured smart nanofibers loaded with CsxWO3 by coaxial electrospinning which demonstrate high heat capacity and NIR absorbance.

scholarly journals Sand Distribution In Central Fergana

2021 ◽  
Vol 03 (01) ◽  
pp. 113-117
Author(s):  
Sanoat Xomdamovna Zokirova ◽  
◽  
Rakhmatillo Fayzullaevich Akbarov ◽  
Sadafxon Mukhammadaminovna Isagaliyeva ◽  
Komila Ravshanovna Xonkeldiyeva ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Capacity ◽  
High Heat ◽  
Climatic Conditions ◽  
High Heat Capacity ◽  
Transfer Properties

Sands have a high heat capacity and rapid heat transfer - properties that sharply distinguish them from all other soils and determine the characteristic climatic conditions of sand massifs.

Usage of Cold Spraying of High-Heat-Capacity Coatings for the Increase of Low- $T_{c}$ Superconductors Stability

2016 ◽  
Vol 26 (3) ◽  
pp. 1-5
Author(s):  
Sergey L. Kruglov ◽  
Igor I. Akimov ◽  
Victor E. Keilin ◽  
Ivan A. Kovalev ◽  
Dmitry A. Kriukov ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Cold Spraying ◽  
High Heat ◽  
High Heat Capacity

Greenhouse Earth to Air Heat Exchanger and its Research Progress

2013 ◽  
Vol 860-863 ◽  
pp. 620-623
Author(s):  
Hui Fang Tian ◽  
Li Kun Shang ◽  
Zhou Wu ◽  
Jing Jing Wang
Keyword(s):  
Sustainable Development ◽  
Heat Capacity ◽  
Heat Exchanger ◽  
Energy Saving ◽  
Future Study ◽  
High Heat ◽  
Research Progress ◽  
The World ◽  
Development Technology ◽  
High Heat Capacity

As a new sustainable development technology, the greenhouse earth to air heat exchanger (EAHE) is more economic and energy-saving than other traditional thermal technologies for greenhouse because of the high heat capacity of the shallow soil. The research progress related to the greenhouse EAHE in China and around the world are viewed and discussed from two main aspects, in which some disadvantages are shown and the future study to be perfected is proposed as well.

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