Abstract—Heart rate variability in Holter electrocardiogram
(ECG) that incidentally recorded the onset process of heatstroke
during golf play was analyzed in comparison to control ECGs in
the same subject and in a healthy control group. During playing
golf normally, the amplitude of high-frequency (HF) component,
known as an index of cardiac parasympathetic function, was
suppressed (4.3 ± 2.2 ms). Whereas, 135 min before the onset of
syncope, spiky HF bursts (amplitude ~10 ms and width <60 s)
appeared repeatedly at an interval of 10-15 min and the burst
amplitude increased to 20-30 ms from 51 min before to the onset
of syncope. No such phenomenon was observed in control ECGs
even during walking exercise. Although spiky HF burst was
observed 30% of subjects in control group, none of them showed
repetitive burst during short period <15 min. Repetitive spiky
HF burst may be a prodromal sign for predicting heatstroke
from heartbeat information.
Index Terms—Heatstroke, syncope, heart rate variability, autonomic nervous system, hot environment, golf, Holter electrocardiogram, complex demodulation.
E. Yuda is with the Department of Electrical Engineering, Tohoku University Graduate School of Engineering, Sendai 980-8759, Japan (e-mail: firstname.lastname@example.org).
R. Iino is with Belling Co., Ltd. Kashiwa City 277-0822, Chiba, Japan Y. Yoshida is with the Nagoya City University Graduate School of Design and Architecture, Nagoya 464-0083, Japan (e-mail: email@example.com).
J. Hayano is with the Department of Medical Education, Nagoya City University Graduate School of Medical Sciences, Nagoya 467-8602, Japan (e-mail: firstname.lastname@example.org).
Cite: Emi Yuda, Rui Iino, Yutaka Yoshida, and Junichiro Hayano, "Spiky Burst of High Frequency Heart Rate Variability: A Prodromal Sign of Syncope Accompanying Heatstroke," International Journal of Environmental Science and Development vol. 10, no. 8, pp. 241-245, 2019.Copyright © 2019 by the authors. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).