Tonic heart rate level, social class and antisocial behaviour in adolescents

Neonatal heart rate variability (NHRV) was studied in 92 preterm infants (birth weight, 750 to 2,500 gm; gestational age, 28 to 36 weeks). Each infant was monitored continuously during the first 6 hours and for one hour at 24, 48, and 168 hours of life. During each hour NHRV was quantified and related to the following parameters: sex, gestational age, postnatal age, heart rate, and the presence and severity of respiratory distress syndrome (RDS). NHRV in healthy preterm infants was inversely related to heart rate level and directly related to the infant's postnatal age. In healthy babies with gestations of 30 to 36 weeks there was no significant correlation between NHRV and gestation. Decrease in NHRV was significantly related to the severity of RDS, and the reappearance of NHRV in infants with RDS was associated with a good prognosis. Decreased NHRV significantly differentiated the infants with RDS who survived after the fifth hour of life. The data reveal that NHRV (1) should be corrected for heart rate level and postnatal age; (2) is decreased in RDS; and (3) can be used as an indicator of morbidity and mortality in preterm infants with RDS.

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Mean Heart Rate Level Does Not Affect All Heart Rate Variability Indices

Hypertension ◽

10.1161/hypertensionaha.117.09060 ◽

2017 ◽

Vol 69 (5) ◽

Cited By ~ 2

Author(s):

Luiz Eduardo Virgilio Silva ◽

Helio Cesar Salgado ◽

Rubens Fazan

Keyword(s):

Heart Rate ◽

Heart Rate Variability ◽

Rate Level ◽

Heart Rate Level ◽

Mean Heart Rate

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Short-Latency Acceleration of Human Heart Rate as a Function of Stimulus Intensity

Perceptual and Motor Skills ◽

10.2466/pms.1977.45.2.579 ◽

1977 ◽

Vol 45 (2) ◽

pp. 579-583 ◽

Cited By ~ 3

Author(s):

J. G. O'Gorman ◽

R. D. Jamieson

Keyword(s):

Heart Rate ◽

White Noise ◽

Stimulus Intensity ◽

Human Heart ◽

Short Latency ◽

Rate Level ◽

Initial Values ◽

Heart Rate Level ◽

The Mean ◽

Female Subjects

The study examined the effectiveness of three intensities of white noise in evoking short-latency acceleration of human heart rate. 3 groups of 10 female subjects were presented with 1-sec. bursts of white noise with virtually instantaneous rise times at intensities of 100 db (re 20 μN/m2), 90 db, or 80 db SPL as measured at the headset. 5 bursts were presented at intervals of 45 sec. while the EKG was recorded. An increase in heart rate during poststimulus beats 3 and 4 compared with the mean rate of the three beats prestimulus was reliably evoked on the first two trials in the 100-db and 90-db groups but not in the 80-db group. Apart from a recovery of acceleration on Trial 5 for the 100-db group, the 100-db and 90-db groups did not differ in amplitude or rate of habituation of the response. Poststimulus heart-rate level was not significantly related to prestimulus level as expected in terms of the law of initial values. The results were interpreted as consistent with F. K. Graham's interpretation of short-latency cardiac acceleration as a component of startle.

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