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Heart Rate Variability at Different Thermal Comfort Levels

Overview
Journal Eur J Appl Physiol
Specialty Physiology
Date 2008 Mar 21
PMID 18351379
Citations 26
Authors
Weiwei Liu
Zhiwei Lian
Yuanmou Liu
Affiliations
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Abstract

The mechanism of human thermal comfort is important for building a comfortable and healthy indoor environment. This paper analyzes human heart rate variability (HRV) at different thermal comfort levels and discusses the mechanism of human thermal comfort. A total of 33 subjects were divided in 3 groups. Under air temperatures of 21, 24, 26, 28, 29, and 30 degrees C, the subjects' electrocardiogram was recorded for 5 min. HRV (the ratio of absolute powers in low- and high-frequency bands, LF/HF ratio) was analyzed. LF/HF at discomfort level were significantly higher than that at comfort level (P < 0.05), despite the same thermal sensation. The results indicate that sympathetic activity plays an important role in subjects' thermal discomfort and the LF/HF ratio may be used as an indicator for human thermal comfort.

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