Thermal comfort and physiological responses with standing and treadmill workstations in summer

Yang, Linlin; Gao, Siru; Zhao, Shengkai; Zhang, Hui; Arens, Edward; Zhai, Yongchao

doi:10.1016/j.buildenv.2020.107238

Cited by 23 publications

(4 citation statements)

References 32 publications

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“…However, the support effect of using an exoskeleton under TEMP does not make up for the improvement of thermal comfort caused by insufficient regulation of environmental factors. Previous studies have observed that low activity levels in a warm environment have better thermal comfort than high activity levels [ 16 , 54 ], which shows the different results from our research. The passive activity regulation caused by the exoskeleton and the spontaneous activity regulation of the human body may have different physical and psychological thermal response mechanisms.…”

Section: Discussioncontrasting

confidence: 99%

“…In the study of physiological parameters and subjective responses, it was found that there is a strong correlation between skin temperature and thermal sensation [ 14 ]. Therefore, the mean skin temperature (MST) calculated by local skin temperatures and the corresponding weighting factors is usually measured as a physiological parameter related to thermal comfort [ 15 , 16 ]. Contrary to a hot environment, when the human body is exposed to a cold environment, the heat transfer from the core of the body to the shell.…”

Section: Introductionmentioning

confidence: 99%

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The Effects of a Passive Exoskeleton on Human Thermal Responses in Temperate and Cold Environments

Liu

Lai

et al. 2021

IJERPH

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The exoskeleton as functional wearable equipment has been increasingly used in working environments. However, the effects of wearing an exoskeleton on human thermal responses are still unknown. In this study, 10 male package handlers were exposed to 10 °C (COLD) and 25 °C (TEMP) ambient temperatures while performing a 10 kg lifting task (LIFTING) and sedentary (REST) both with (EXO) and without the exoskeleton (WEXO). Thermal responses, including the metabolic rate and mean skin temperature (MST), were continuously measured. Thermal comfort, thermal sensation and sweat feeling were also recorded. For LIFTING, metabolic heat production is significant decrease with the exoskeleton support. The MST and thermal sensation significantly increase when wearing the exoskeleton, but thermal discomfort and sweating are only aggravated in TEMP. For REST, MST and thermal sensation are also increased by the exoskeleton, and there is no significant difference in the metabolic rate between EXO and WEXO. The thermal comfort is significantly improved by wearing the exoskeleton only in COLD. The results suggest that the passive exoskeleton increases the local clothing insulation, and the way of wearing reduces the “pumping effect”, which makes a difference in the thermal response between COLD and TEMP. Designers need to develop appropriate usage strategies according to the operative temperature.

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Section: Discussioncontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Effects of a Passive Exoskeleton on Human Thermal Responses in Temperate and Cold Environments

Liu

Lai

et al. 2021

IJERPH

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“…Further, indifference in the P300 potential, latency, and reaction time between cold and heating was different to a previous study that reported significant changes in the P300 latency between pre (T sk = 35.0 • C) and cold stress conditions (T sk = 30. Moreover, in the cooling and heating conditions, the ambient temperatures were similar to the comfort temperature range (20.5-28.2 • C) reported by Yang et al [62]. We consider that the IDN group in our study had adapted to a hot environment (as they resided in IDN for > 20 years).…”

Section: Discussionsupporting

confidence: 78%

Brain Response and Reaction Time in Natural and Comfort Conditions, with Energy-Saving Potential in an Office Environment

Budiawan

Sakakibara²,

Tsuzuki

2021

Energies

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Psychological adaptation to ambient temperatures is fascinating and critical, both theoretically and practically, for energy efficiency in temperate climates. In this study, we investigated and compared the brain response (event-related potentials with a late positive component and latency ~300 milliseconds; labeled “P300” in the present study) and reaction times of Indonesian participants (n = 11), as tropical natives living in Japan, and Japanese participants (n = 9) in natural (i.e., hot during the summer and cold during the winter) and comfort conditions (with cooling and heating). Thermal comfort under contrasting conditions was studied using both instruments and subjective ratings. P300 potential and reaction time were measured before and after a Uchida–Kraepelin (U–K) test (30 summation lines). The results showed that P300 potential and latency did not change between the pre- and post-U–K test among conditions in any of the groups. Furthermore, Indonesian participants showed lower P300 potential (hot conditions) and slower P300 latency (hot and cooling conditions) than Japanese participants. We also found that the reaction time of the Indonesian group significantly differed between the pre- and post-U–K test in an air-conditioned environment, with either cooling or heating. In this study, Indonesian participants demonstrated a resistance to P300 and worse reaction times during work in a thermally unfamiliar season, specifically indicated by the indifferent performances among contrasting environmental conditions. Indonesian participants also showed similar thermal and comfort sensations to Japanese participants among the conditions. In the winter, when the Indonesian neutral temperature is higher than Japanese’s, the energy consumption may increase.

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“…In addition, for the evaluation of the thermal indoor climate, use should be made of a thermophysiological model based on more test subjects and suitable for a wider field of application than the current model, as shown in NEN-EN-ISO-7730. The so-called NEN-EN-ISO-7730 model should be revised [14,18] and re-derived [21] , if one still wants to continue to use it worldwide, as a standardized model, for evaluating the thermal indoor climate in enclosed spaces, with regard of moderate activities [22] and/or to warm situations, as a result of for instance climate change.…”

Section: Discussionmentioning

confidence: 99%

Proposal for the assessment of thermal indoor climate based on the thermal acceptability, in addition to the thermal (dis)satisfied.

Roelofsen,

Vink

2023

Jounarl of Building Design and Environment

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For the sake of energy and cost savings, it is sometimes necessary to maintain the indoor climate in a room at conditions that deviate from optimal thermal comfort. More important than thermal sensation is how a change in conditions will affect the thermal acceptability of a space and whether the percentage of people who are (dis)satisfied with the environment will change with regard of the acceptability. The aim of this technical note and arithmetic study is to find out to what extent the thermal indoor climate can be assessed on the basis of thermal acceptability, in addition to the thermal (dis)satisfied, by making use of research that has already been carried out. In addition to the relationship between the percentage of (dis)satisfied and acceptability, attention is paid to how this result relates to current Dutch government building regulations. The paper concerns a proposal for the assessment of thermal indoor climate based on the thermal acceptability, in addition to the thermal (dis)satisfied.

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Thermal comfort and physiological responses with standing and treadmill workstations in summer

Cited by 23 publications

References 32 publications

The Effects of a Passive Exoskeleton on Human Thermal Responses in Temperate and Cold Environments

The Effects of a Passive Exoskeleton on Human Thermal Responses in Temperate and Cold Environments

Brain Response and Reaction Time in Natural and Comfort Conditions, with Energy-Saving Potential in an Office Environment

Proposal for the assessment of thermal indoor climate based on the thermal acceptability, in addition to the thermal (dis)satisfied.

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