Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical and Electronics Engineers (IEEE)  

DOI： 10.1109/access.2025.3561285

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1541/ieejsmas.145.53

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Physiological Society  

Factors explaining individual variations in whole-body sweat sodium ion concentration ([Na⁺]) during exercise are not fully understood. Galvanic skin conductance (GSC) reflects the electrical properties of the skin influenced by sweat rate (SR) and the presence of ions. Initiation of increases in this response to elevating sweating may reflect exceeding the maximal capacity of sweat ion reabsorption in sweat glands. We investigated whether the SR threshold for increasing GSC, an indirect measure of maximum ion reabsorption rates of sweat glands, explains the variations in whole-body sweat [Na⁺]. Thirty young healthy males cycled for 90 min at incremental exercise intensities of 30, 45, and 60% peak oxygen uptake (30 min each) in the heat (32°C, 50%RH). Whole-body sweat [Na⁺] was measured using a whole-body washdown technique. The SR threshold for increasing GSC was determined from the relationship between the local SR (ventilated capsule) and GSC on the forearm and chest. The average whole-body sweat [Na⁺] was 42.8 ± 18.9 (range, 14.4-81.0) mmol L^-1, and the SR threshold for increasing GSC was 0.29 ± 0.20 (range, 0.02-0.62) and 0.35 ± 0.30 (range, 0.01-1.40) mg cm⁻² min⁻¹ for the forearm and chest, respectively. Whole-body sweat [Na⁺] was not correlated with the SR threshold for increasing GSC in the forearm or chest ( r² {less than or equal to} 0.001, P {greater than or equal to} 0.921). We conclude that the SR threshold for increasing GSC at the forearm and chest does not explain the individual variation in whole-body sweat [Na⁺] during exercise in the heat.

DOI： 10.1152/ajpregu.00149.2024

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical and Electronics Engineers (IEEE)  

DOI： 10.1109/lsens.2024.3435965

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Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical and Electronics Engineers (IEEE)  

DOI： 10.1109/lsens.2024.3398251

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.sna.2024.115136

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Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical and Electronics Engineers (IEEE)  

DOI： 10.1109/lsens.2023.3331235

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Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.polymer.2023.126439

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Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

Real-time monitoring of heart rate is useful for monitoring workers. Wearable heart rate monitors worn on the upper body are less susceptible to artefacts caused by arm and wrist movements than popular wristband-type sensors using the photoplethysmography method. Therefore, they are considered suitable for stable and accurate measurement for various movements. In this study, we conducted an experiment to verify the accuracy of our developed and commercially available wearable heart rate monitor consisting of a smart shirt with bioelectrodes and a transmitter, assuming a real-world work environment with physical loads. An exercise protocol was designed to light to moderate intensity according to international standards because no standard exercise protocol for the validation simulating these works has been reported. This protocol includes worker-specific movements such as applying external vibration and lifting and lowering loads. In the experiment, we simultaneously measured the instantaneous heart rate with the above wearable device and a Holter monitor as a reference to evaluate mean absolute percentage error (MAPE). The MAPE was 0.92% or less for all exercise protocols conducted. This value indicates that the accuracy of the wearable device is high enough for use in real-world cases of physical load in light to moderate intensity tasks such as those in our experimental protocol. In addition, the experimental protocol and measurement data devised in this study can be used as a benchmark for other wearable heart rate monitors for use for similar purposes.

DOI： 10.3390/s22239241

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Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

Temperature elevation due to global warming increases the risks of dehydration, which can induce heat-related illness. Proper rehydration with appropriate amounts of water and electrolytes is essential to aid body fluid homeostasis. Wearable sweat sensors which can monitor both the sweat rate and sweat electrolyte concentration may be an effective tool for determining appropriate rehydration. Here, we developed a novel potentially wearable sensor that can monitor both the local sweat rate and sweat electrolyte concentration continuously. The new device includes a system with a short microfluidic pathway that guides the sweat appearing on the skin to a small space in the device to form a quantifiable droplet. The sweat rate is assessed from the time for the droplet to appear and droplet volume, while an integrated electric sensor detects the sodium chloride concentration in each sweat droplet. We demonstrated that this new device could record both the flow rates of artificial sweat and its sodium chloride concentration in ranges of human sweating with an accuracy within ±10%. This is equivalent to the accuracy of commercially available sweat rate meters and sweat ion sensors. The present study provides a new perspective for the design of wearable sensors that can continuously monitor sweat rates and sweat electrolyte concentrations for potential application to a healthcare device.

DOI： 10.3390/mi13040575

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DOI： 10.53829/ntr202106fa7

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Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical and Electronics Engineers (IEEE)  

DOI： 10.1109/access.2021.3110252

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Publishing type：Research paper (scientific journal)   Publisher：NTT Science and Core Technology Laboratory Group  

DOI： 10.53829/ntr202010ra2

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Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：Wiley  

DOI： 10.1002/sia.6471

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Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

DOI： 10.3390/mi9040186

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Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.apsusc.2017.04.032

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Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.mee.2017.04.005

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Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

DOI： 10.3390/ma9080621

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Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical Engineers of Japan (IEE Japan)  

DOI： 10.1541/ieejsmas.136.488

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Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：Wiley  

DOI： 10.1002/sia.5769

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Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/NANO.2015.7388875

Web of Science

Scopus

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Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

<p>The photocured elastomer presented here provided extremely high replication accuracy due to its thermal shrinkage of less than 0.02%, compared to 2.91% in the heat-cured elastomer.</p>

DOI： 10.1039/c4ra12062k

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Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/NANO.2015.7388650

Web of Science

Scopus

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/NANO.2015.7388788

Web of Science

Scopus

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Language：English   Publishing type：Research paper, summary (international conference)  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Lead author,　Corresponding author   Publishing type：Research paper, summary (international conference)  

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Lead author,　Corresponding author   Publishing type：Research paper, summary (international conference)  

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Authorship：Lead author   Publishing type：Research paper, summary (international conference)  

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Authorship：Lead author,　Corresponding author   Publishing type：Research paper, summary (international conference)  

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Publishing type：Research paper, summary (international conference)  

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Authorship：Lead author,　Corresponding author   Publishing type：Research paper, summary (international conference)  

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Authorship：Lead author   Publishing type：Research paper, summary (international conference)  

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

Low-cost but precise fabrication technology for nano/micro devices is required in the field of lab-on-a-chip and Micro Total Analysis Systems (μTAS), etc. Micro molding using of silicone is a beneficial technique and widely applied to fabricate nano/micro device at low cost. However, the silicone has a drawback caused by thermal shrinkage by residual thermal stress during the curing process. To avoid the thermal shrinkage to realize more precise molding, we tried to use a photosensitive (photo-curable) silicone, which requires no heat to cure the material. In this study, it was evaluated the optimum curing condition, optical absorbance, tensile strength, and hardness as the basic properties of photosensitive silicone. The evaluated characteristics indicate that the photosensitive silicone has excellent optical and mechanical properties compared with conventional thermoset ones. Especially, the shrinkage rate of the photosensitive silicone was 0.02 %, whereas the conventional thermoset silicone was 2.9 %.

DOI： 10.1299/jsmemnm.2014.6._22pm1-F2-

CiNii Books

CiNii Research

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Application no：特願2021-007044  Date applied：2021.1

Patent/Registration no：特許7576265  Date registered：2024.10 

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Application no：特願2021-007045  Date applied：2021.1

Patent/Registration no：特許7572679  Date registered：2024.10 

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Application no：特願2022-558631  Date applied：2020.10

Patent/Registration no：特許7521591  Date registered：2024.7 

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Application no：特願2022-558627  Date applied：2020.10

Patent/Registration no：特許7619372  Date registered：2025.1 

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Type：Peer review 

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