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Diurnal change in psychological and physiological responses to consistent relative humidity

Kakitsuba, Naoshi, Chen, Qimin, Komatsu, Yoshinori·2020·Journal of Thermal Biology
DOI 10.1016/j.jtherbio.2019.102490
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Abstract

Diurnal changes in physiological and psychological responses to consistent relative humidity (RH) conditions were investigated in the present study. Lightly clothed six male and six female subjects participated in the first experiment at 40% and 50% RH, and seven male and seven female subjects participated in the second experiment at 60%, 70%, and 80% RH. Both experiments were conducted at 28 °C air temperature (T a) from 9:00-18:30. Skin temperatures, local heat flux rates and tympanic temperature (T ty) were monitored at 2-min intervals throughout the experimental period. Body weight loss and oxygen consumption rate were measured during the 9:30-10:30, 13:30-14:30, and 17:30-18:30 periods. Thermal sensation and thermal comfort responses were recorded at the same periods. The amount of heat loss was greater than metabolic heat production (M) in the male subjects but was well balanced with M in the female subjects. A morning increase in T ty at 50%-80% RH was observed, and mean skin temperature (T‾sk) at 70% and 80% RH was significantly higher (p < 0.05) than T sk at 40% and 50% RH in both subject groups. Although difference in the relationship between thermal sensation and T‾sk based on sex was confirmed, diurnal changes in thermal sensation were observed in both subject groups based on the responses of "warm" in the morning but "neutral" or "slightly warm" in the evening at 70% and 80% RH. This result demonstrates that high RH may be acceptable in the late afternoon and evening at 28 °C and indicates that dynamic control of RH during the daytime (e.g., low RH in the morning and high RH in late afternoon) may be beneficial to save energy when using air-conditioning.

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Crossref · 10.1016/j.jtherbio.2019.102490

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Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • More recent evidence contradicts findings from early thermal comfort studies, suggesting circadian variation plays a role in human thermal perception.

    “However, more recent evidence contradicts the findings from those early studies [18,19], suggesting that circadian variation plays a role in human thermal perception.”

    From Human thermal perception and time of day: A review (2021) · cites this paper as [18]

  • Among the 15 reviewed experimental studies investigating diurnal variations in thermal perception, two observed significant differences but were conducted only with male subjects.

    “two observed significant differences but were conducted only with male subjects [18,75]”

    From Human thermal perception and time of day: A review (2021) · cites this paper as [18]

  • Based on results from four studies, there is a tendency to prefer higher temperatures in the early evening compared to other times of the day.

    “based on the results from four studies [18,19,73,77], there is a tendency to prefer higher temperatures in the early evening compared to other times of the day.”

    From Human thermal perception and time of day: A review (2021) · cites this paper as [18]

  • In Kakitsuba's winter experiment, significant effects of time period on thermal sensation vote were observed for male but not female subjects, who felt coldest in the evening.

    “significant effects of the time period on the thermal sensation vote were observed for the male (but not for the female) subjects who felt coldest in the evening.”

    From Human thermal perception and time of day: A review (2021) · cites this paper as [18]

  • In Kakitsuba's winter experiment, no significant differences in tympanic temperature, mean skin temperature and thermal comfort were observed between morning, afternoon, and evening under any conditions.

    “No significant differences in tympanic temperature, mean skin temperature and thermal comfort were observed between the three periods under any of the conditions”

    From Human thermal perception and time of day: A review (2021) · cites this paper as [18]

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Authors
Kakitsuba, N., Chen, Q., & Komatsu, Y.
Affiliations
  • Meijo University (JP)
  • Nagoya Institute of Technology (JP)
Corresponding author
Kakitsuba, Naoshi
ORCID
Venue
Journal of Thermal Biology
Publisher
Elsevier BV
Published
2020-02
Volume
88
Pages
102490
ISSN
0306-4565 (ISSN-L)
DOI
10.1016/j.jtherbio.2019.102490
OpenAlex
W2998169031
Cited by
9
References
35
Citations by year
2024: 2 · 2023: 4 · 2022: 1 · 2021: 2
FWCI
0.09
Type
journal article
Language
en
Open access
closed
Licence
Locations
  • Journal of Thermal Biology (publishedVersion)
  • PubMed (publishedVersion)
Funders
Meijo University
Topics
  • Health Sciences › Medicine › Physiology › Thermoregulation and physiological responses
  • Physical Sciences › Engineering › Building and Construction › Building Energy and Comfort Optimization
  • Physical Sciences › Materials Science › Polymers and Plastics › Textile materials and evaluations
Keywords
relative humidity, diurnal variation, thermal sensation, thermal comfort, skin temperature, tympanic temperature, heat flux, weight loss, oxygen consumption, sex differences, metabolic heat production, air conditioning energy saving, indoor climate control
MeSH terms
Adaptation, Physiological, Adaptation, Psychological, Body Weight, Circadian Rhythm, Female, Humans, Humidity, Male, Oxygen Consumption, Sex Characteristics, Skin Temperature, Temperature

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