Investigation of bio-signal changes of occupants resting in buildings using local cooling and heating seats

Minjung Lee, Yunchan Shin, Hoseong Lee, Honghyun Cho

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The electroencephalogram (EEG), photoplethysmography (PPG), subjective questionnaires, surface temperature, and concentration of subjects for various resting conditions in the building under cooling and heating conditions were investigated to improve their quality of rest and examine the effect of environmental changes on various biosignals comprehensively. As a result, the use of a cold water seat during a rest under cooling condition activated θ wave and α wave in the subjects and decreased low frequency/high frequency (LF/HF) ratio and stress. In addition, the hot water seat used during a rest under heating conditions provided subjects with a stable rest environment because it activated the PPG and θ wave of the subjects and decreased the LF/HF ratio. However, the stress index of the subjects was slightly higher when electric heating and hot water seats were used. The subjective questionnaire showed that the use of an electric heating seat provided subjects with a comfortable environment and high concentration compared to those of other seat types.

Original languageEnglish
Article number111092
JournalEnergy and Buildings
Publication statusPublished - 2021 Aug 15

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2020R1A5A118153 ).

Publisher Copyright:
© 2021 Elsevier B.V.


  • Comfort sensation vote (CSV)
  • Concentration level vote (CLV)
  • Electroencephalogram (EEG)
  • Photo-plethysmography (PPG)
  • Stress index
  • Thermal sensation vote (TSV)

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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