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Heart rate variability as a predictive biomarker of thermal comfort

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Abstract

Thermal comfort is an assessment of one’s satisfaction with the surroundings; yet, most mechanisms that are used to provide thermal comfort are based on approaches that preclude physiological, psychological and personal psychophysics that are precursors to thermal comfort. This leads to many people feeling either cold or hot in an environment that was supposed to be thermally comfortable to most users. To address this problem, this paper proposes to use heart rate variability (HRV) as an alternative indicator of thermal comfort status. Since HRV is linked to homeostasis, we conjectured that people’s thermal comfort could be more accurately estimated based on their heart rate variability (HRV). To test our hypothesis, we analyzed statistical, spectral, and nonlinear HRV indices of 17 human subjects doing light office work in a cold, a neutral, and a hot environment. The resulting HRV indices were used as inputs to machine learning classification algorithms. We observed that HRV is distinctively different depending on the thermal environment and that it is possible to reliably predict each subject’s thermal state (cold, neutral, and hot) with up to a 93.7% accuracy. The result of this study suggests that it could be possible to design automatic real-time thermal comfort controllers based on people’s HRV.

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  1. Graduate School of Science and Engineering, Aoyama Gakuin University, 1-10-5, Fuchinobe, Chuo-ku, Kanagawa, Japan

    Kizito N. Nkurikiyeyezu, Yuta Suzuki & Guillaume F. Lopez

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  1. Kizito N. Nkurikiyeyezu
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  2. Yuta Suzuki
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Correspondence to Kizito N. Nkurikiyeyezu.

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Nkurikiyeyezu, K.N., Suzuki, Y. & Lopez, G.F. Heart rate variability as a predictive biomarker of thermal comfort. J Ambient Intell Human Comput 9, 1465–1477 (2018). https://doi.org/10.1007/s12652-017-0567-4

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