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8. Heart rate variability at different thermal comfort levels.

Author

Weiwei Liu, Zhiwei Lian, Yuanmou Liu, Liu, Weiwei, Lian, Zhiwei, and Liu, Yuanmou

Subjects
HEART beat, THERMAL comfort, ELECTROCARDIOGRAPHY, SYMPATHETIC nervous system, BODY temperature, PHYSIOLOGY
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. [ABSTRACT FROM AUTHOR]

Published
2008
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