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Perceived air quality and cognitive performance decrease at moderately raised indoor temperatures even when clothed

Li Lan1,2, Lulu Xia1,2, Rihab Hejjo2

  • 1Department of Architecture, School of Design, Shanghai Jiao Tong University, Shanghai, China.

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Summary
This summary is machine-generated.

Even when thermal comfort is maintained through clothing adjustments, higher temperatures (27°C) negatively impact cognitive performance and increase mental load. Physiological stress responses indicate that moderately elevated temperatures should be avoided to optimize performance.

Keywords:
acute subclinical health symptomsair temperatureelevated temperaturephysiological responsesthermal comfortwork performance

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Area of Science:

  • Environmental Psychology
  • Human Physiology
  • Occupational Health

Background:

  • Maintaining thermal comfort is crucial for well-being and performance.
  • Elevated temperatures can induce physiological stress and affect cognitive function.
  • The impact of achieving thermal comfort via clothing adjustment at higher temperatures on health symptoms and cognition requires further investigation.

Purpose of the Study:

  • To determine if neutral thermal comfort at moderately elevated temperatures prevents negative effects on health symptoms, comfort, and cognitive performance.
  • To assess physiological responses and cognitive task performance at 23°C versus 27°C.
  • To understand the relationship between physiological stress, perceived comfort, and cognitive outcomes.

Main Methods:

  • Twelve subjects adjusted clothing to maintain thermal comfort at 23°C and 27°C.
  • Subjects rated environmental perception, comfort, health symptoms, and mental load.
  • Cognitive tasks were performed, and physiological parameters (skin temperature, SpO2, respiration rate, pNN50) were monitored.

Main Results:

  • Cognitive performance was significantly impaired at 27°C compared to 23°C.
  • Subjects reported higher mental load and perceived worse air quality at 27°C.
  • Physiological indicators showed increased stress at 27°C, including higher skin temperature and respiration rate, and lower blood oxygen saturation (SpO2) and pNN50.

Conclusions:

  • Moderately elevated temperatures can reduce cognitive performance and increase physiological stress, even when thermal comfort is subjectively achieved through clothing adjustments.
  • The observed physiological changes, rather than increased health symptoms, appear to mediate performance decrements.
  • Avoiding moderately elevated temperatures is recommended to maintain optimal cognitive function and performance.