TITLE:
Effects of Different Types of Verbal Activities on Heart Rate Variability
AUTHORS:
Ping Shi, Youfang Fang, Hongliu Yu
KEYWORDS:
Verbal Activities; Heart Rate Variability; Time Domain Analysis; Frequency Domain Analysis; Poincaré Plot Parameters
JOURNAL NAME:
Engineering,
Vol.5 No.10B,
November
1,
2013
ABSTRACT: In the present study, the effects of different types of
verbal activities on heart rate variability (HRV) were investigated. ECG
signals were recorded in ten volunteers during resting (R), reading silently (RS),
reading aloud (RA) and talking freely (TF). Time domain, frequency domain and Poincaré
plot measures of HRV were calculated for analyzing. Time domain parameter of
pNN50, frequency domain parameter of LF (n.u.) and Poincaré
plot parameter of SD1/SD2 were found statistically difference in RA and TF
compared to R and RS. The results in this study show that HRV decreased while
subjects were reading aloud and talking freely. The results also indicated that
verbal activities of reading aloud and talking freely improve the sympathetic
nervous activity.