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Periyaswamy T, Balasubramanian M. Combining multiple human physiological signals using fuzzy logic to determine stress caused by battle dress uniforms. SN APPLIED SCIENCES 2022. [DOI: 10.1007/s42452-022-05199-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
Abstract
Abstract
This study presents a novel stress index for clothing using physiological signals to estimate stress induced by battle dress uniforms (BDU) during physical activity. The approach uses a fuzzy logic-based nonlinear mapping to compute the stress from physiological signals. Ten healthy men performed a battery of physical activities in a controlled environment. Heart rate (HR), respiration rate (RR), skin temperature (ST), and galvanic skin response (GSR) were measured continuously for the participants during activity wearing three kinds of clothing (two BDUs and a control garment). The individual physiological responses were combined using a fuzzy-logic system to derive a stress measure called Clothed Activity Stress Index (CASI). Repeated measures ANOVA showed that the garments significantly (α = .05) affected the HR (p < .001) and RR (p < .001). In addition, interactions between the activity and garment were significant for HR, RR, and ST (p < .001, p < .001, p < .036). The physiological measures differed significantly between rest and activity for the two uniforms. The stress indices (ranging between 0 and 1) during rest and activity were 0.24 and 0.35 for control, 0.27 and 0.43 for BDU-1, and 0.33 and 0.44 for BDU-2. It is shown here that clothing systems impact human stress levels to a measurable level. This computational approach is applicable to measure stress caused by protective wear under different operational conditions and can be suitable for sports and combat gears.
Article Highlights
A computational approach to non-linearly map human physiological signals and stress is presented.
The stress caused by functional clothing systems is estimated using a fuzzy-logic mapping system for battle dress uniforms.
Heart and respiration rates are highly sensitive to stress, while skin temperature and galvanic skin response are moderately sensitive.
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Zhu B, Li W, Zhang Q, Li D, Liu X, Wang Y, Xu N, Wu Z, Li J, Li X, Catrysse PB, Xu W, Fan S, Zhu J. Subambient daytime radiative cooling textile based on nanoprocessed silk. NATURE NANOTECHNOLOGY 2021; 16:1342-1348. [PMID: 34750560 DOI: 10.1038/s41565-021-00987-0] [Citation(s) in RCA: 70] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Accepted: 08/31/2021] [Indexed: 06/13/2023]
Abstract
Decreasing energy consumption is critical to sustainable development. Because temperature regulation for human comfort consumes vast amounts of energy, substantial research efforts are currently directed towards developing passive personal thermal management techniques that cool the human body without any energy consumption1-9. Although various cooling textile designs have been proposed previously, textile-based daytime radiative cooling to a temperature below ambient has not been realized6-13. Silk, a natural protein fabric produced by moth caterpillars, is famous for its shimmering appearance and its cooling and comforting sensation on skin14-17. It has been recently recognized that silk, with its optical properties derived from its hierarchical microstructure, may represent a promising starting point for exploring daytime radiative cooling18-21. However, the intrinsic absorption of protein in the ultraviolet region prevents natural silk from achieving net cooling under sunlight. Here we explore the nanoprocessing of silk through a molecular bonding design and scalable coupling reagent-assisted dip-coating method, and demonstrate that nanoprocessed silk can achieve subambient daytime radiative cooling. Under direct sunlight (peak solar irradiance >900 W m-2) we observed a temperature of ~3.5 °C below ambient (for an ambient temperature of ~35 °C) for stand-alone nanoprocessed silks. We also observed a temperature reduction of 8 °C for a simulated skin when coated with nanoprocessed silk, compared with natural silk. This subambient daytime radiative cooling of nanoprocessed silk was achieved without compromising its wearability and comfort. This strategy of tailoring natural fabrics through scalable nanoprocessing techniques opens up new pathways to realizing thermoregulatory materials and provides an innovative way to sustainable energy.
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Affiliation(s)
- Bin Zhu
- National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing, People's Republic of China
| | - Wei Li
- GPL Photonics Lab, State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, People's Republic of China
| | - Qian Zhang
- National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing, People's Republic of China
- State Key Laboratory of New Textile Materials and Advanced Processing Technologies, School of Textile Science and Engineering, Wuhan Textile University, Wuhan, People's Republic of China
| | - Duo Li
- National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing, People's Republic of China
| | - Xin Liu
- National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing, People's Republic of China
| | - Yuxi Wang
- National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing, People's Republic of China
| | - Ning Xu
- National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing, People's Republic of China
| | - Zhen Wu
- National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing, People's Republic of China
| | - Jinlei Li
- National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing, People's Republic of China
| | - Xiuqiang Li
- National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing, People's Republic of China
| | - Peter B Catrysse
- Department of Electrical Engineering, Ginzton Laboratory, Stanford University, Stanford, CA, USA
| | - Weilin Xu
- State Key Laboratory of New Textile Materials and Advanced Processing Technologies, School of Textile Science and Engineering, Wuhan Textile University, Wuhan, People's Republic of China
| | - Shanhui Fan
- Department of Electrical Engineering, Ginzton Laboratory, Stanford University, Stanford, CA, USA.
| | - Jia Zhu
- National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing, People's Republic of China.
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Nassiri P, Monazzam MR, Golbabaei F, Farhang Dehghan S, Shamsipour A, Ghanadzadeh MJ, Asghari M. Modeling heat stress changes based on wet-bulb globe temperature in respect to global warming. JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE & ENGINEERING 2020; 18:441-450. [PMID: 33312573 PMCID: PMC7721789 DOI: 10.1007/s40201-020-00472-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 01/22/2020] [Accepted: 04/08/2020] [Indexed: 06/12/2023]
Abstract
BACKGROUND This ecological study aims to model the trend of changes in exposure of outdoor workers to heat stress in outdoors in the coming decades with the use of the Wet-Bulb Globe Temperature (WBGT), Hadley Coupled Atmosphere- Ocean General Circulation Model, version 3 (HADCM3), and Long Ashton Research Station Weather Generator (LARS-WG) in Tehran, Iran, considering the climate change and the global warming. METHODS The hourly values of environmental parameters including minimum and maximum air temperature, relative humidity, precipitation and radiation related to Prakash , Shahriar and Damavand cities were obtained from the Meteorological Organization of Iran. These data were recorded during 1965 to 2015. The climate modeling was done for 2011-2030, 2046-2065, and 2080-2099. RESULTS The minimum and maximum air temperatures in the different months of the year in the three studied cities show an increasing trend. Our finding shows that the WBGT will be increased by 2099. In Pakdasht, this index will be close to the danger zone in the coming years, especially in 2080-2099. CONCLUSIONS All the results obtained indicate an increase in risk of heat stress in outdoor workplaces, given the global warming.
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Affiliation(s)
- Parvin Nassiri
- Department of Occupational Health, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammad Reza Monazzam
- Department of Occupational Health, School of Public Health, Center for Air Pollution Research (CAPR), Institute for Environmental Research (IER), Tehran University of Medical Sciences, Tehran, Iran
| | - Farideh Golbabaei
- Department of Occupational Health, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Somayeh Farhang Dehghan
- Workplace Health Promotion Research Center, School of Public Health and Safety, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Aliakbar Shamsipour
- Department of Physical Geography, School of Geography, University of Tehran, Tehran, Iran
| | - Mohammad Javad Ghanadzadeh
- Department of Environmental Health Engineering, Faculty of Health, Arak University of Medical Sciences, Arak, Iran
| | - Mehdi Asghari
- Department of Occupational Health Engineering, Faculty of Health, Arak University of Medical Sciences, Arak, Iran
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Evaluation of the Combined Effects of Heat and Lighting on the Level of Attention and Reaction Time: Climate Chamber Experiments in Iran. ScientificWorldJournal 2018; 2018:5171582. [PMID: 29861665 PMCID: PMC5971232 DOI: 10.1155/2018/5171582] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Revised: 03/07/2018] [Accepted: 03/25/2018] [Indexed: 11/21/2022] Open
Abstract
Heat exposure and unsuitable lighting are two physical hazardous agents in many workplaces for which there are some evidences regarding their mental effects. The purpose of this study was to assess the combined effect of heat exposure and different lighting levels on the attention rate and reaction time in a climatic chamber. This study was conducted on 33 healthy students (17 M/16 F) with a mean (±SD) age of 22.1 ± 2.3 years. The attention and reaction time test were done by continuous performance test and the RT meter, respectively, in different exposure conditions including the dry temperatures (22°C and 37°C) and lighting levels (200, 500, and 1500 lux). Findings demonstrated that increase in heat and lighting level caused a decrease in average attention percentage and correct responses and increase in commission error, omission error, and response time (P < 0.05). The average of simple, diagnostic, two-color selective, and two-sound selective reaction times increased after combined exposure to heat and lighting (P < 0.05). The results of this study indicated that, in job task which requires using cognitive functions like attention, vigilance, concentration, cautiousness, and reaction time, the work environment must be optimized in terms of heat and lighting level.
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NASSIRI P, MONAZZAM MR, GOLBABAEI F, FARHANG DEHGHAN S, RAFIEEPOUR A, MORTEZAPOUR AR, ASGHARI M. Application of Universal Thermal Climate Index (UTCI) for assessment of occupational heat stress in open-pit mines. INDUSTRIAL HEALTH 2017; 55:437-443. [PMID: 28804096 PMCID: PMC5633359 DOI: 10.2486/indhealth.2017-0018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Accepted: 07/31/2017] [Indexed: 06/07/2023]
Abstract
The purpose of this article is to examine the applicability of Universal Thermal Climate Index (UTCI) index as an innovative index for evaluating of occupational heat stress in outdoor environments. 175 workers of 12 open-pit mines in Tehran, Iran were selected for this research study. First, the environmental variables such as air temperature, wet-bulb temperature, globe temperature, relative humidity and air flow rate were measured; then UTCI, wet-bulb globe temperature (WBGT) and heat stress index (HSI) indices were calculated. Simultaneously, physiological parameters including heart rate, oral temperature, tympanic temperature and skin temperature of workers were measured. UTCI and WBGT are positively significantly correlated with all environmental parameters (p<0.03), except for air velocity (r<-0.39; p>0.05). Moreover, a strong significant relationship was found between UTCI and WBGT (r=0.95; p<0.001). The significant positive correlations exist between physiological parameters including oral temperature, tympanic and skin temperatures and heart rate and both the UTCI and WBGT indices (p<0.029). The highest correlation coefficient has been found between the UTCI and physiological parameters. Due to the low humidity and air velocity (~<1 m/s) in understudied mines, UTCI index appears to be appropriate to assess the occupational heat stress in these outdoor workplaces.
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Affiliation(s)
- Parvin NASSIRI
- Department of Occupational Health, School of Public Health, Tehran University of Medical Sciences, Iran
| | - Mohammad Reza MONAZZAM
- Department of Occupational Health, School of Public Health and Center for Air Pollution Research (CAPR), Institute for Environmental Research (IER), Tehran University of Medical Sciences, Iran
| | - Farideh GOLBABAEI
- Department of Occupational Health, School of Public Health, Tehran University of Medical Sciences, Iran
| | - Somayeh FARHANG DEHGHAN
- Department of Occupational Health, School of Public Health, Shahid Beheshti University of Medical Sciences, Iran
| | - Athena RAFIEEPOUR
- Department of Occupational Health, School of Public Health, Student Research Committee, Shahid Beheshti University of Medical Sciences, Iran
| | - Ali Reza MORTEZAPOUR
- Department of Occupational Health, School of Public Health, Student Scientific Research Center, Tehran University of Medical Sciences, Iran
| | - Mehdi ASGHARI
- Department of Occupational Health, School of Public Health, Tehran University of Medical Sciences, Iran
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