Respiratory influences on cardiac responses during attention

Cheung, Michael N.; Porges, Stephen W.

doi:10.3758/bf03335298

Cited by 53 publications

(21 citation statements)

References 8 publications

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“…For each epoch the IBIs were converted to equally spaced, time-based data by calculating the weighted heart period for successive 200-msec windows (Cheung & Porges, 1977). To remove the low-frequency component, the weighted IBI files were filtered in the time domain using a 21-point third-order moving polynomial (Bohrer & Porges, 1982).…”

Section: Methodsmentioning

confidence: 99%

Vagal tone during quiet sleep in normal human term fetuses

Groome

et al. 1994

Developmental Psychobiology

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The purpose of this paper was to calculate vagal tone (V) for 17 normal human fetuses in quiet sleep (QS) between 36 and 40 weeks gestation. The fetal cardiac electrical signal was captured transabdominally in 3-min blocks at a rate of 833 times per second and fetal R-waves were extracted using adaptive signal processing techniques. Fetal R-wave interbeat intervals were converted to equally spaced, time-based data, and the low-frequency component was removed using a 21-point third-order moving polynomial. The parameter V was calculated by taking the natural logarithm of the sum of the power densities between 0.3 Hz and 1.3 Hz. We found that fetal breathing was associated with an approximately 25% increase in V as compared to nonbreathing, 3.33 +/- 0.48 versus 2.57 +/- 0.47, p < 0.0001. Furthermore, there was a significant linear relationship between the mean single-fetus V during spontaneous respiration and the mean single-fetus V during normally occurring apneic periods, r = 0.772, p < 0.002. We conclude that respiratory activity is associated with a significant increase in vagal tone for normal human fetuses in QS.

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Section: Methodsmentioning

confidence: 99%

Vagal tone during quiet sleep in normal human term fetuses

Groome

et al. 1994

Developmental Psychobiology

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“…To avoid transition effects, only data from the first 20 seconds of the before period and the last 20 seconds of the after period were used. HR was analyzed with a program that computed estimates of instantaneous heart rate for every 0.5-second interval [27].…”

Section: Data Analysistoctocmentioning

confidence: 99%

Voluntary Breath Holding in Panic and Generalized Anxiety Disorders

Roth

Wilhelm

Trabert

1998

Psychosomatic Medicine

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“…Since the cross-spectral analysis assumes that the data are sequences of events equally spaced in time and the responses in the reaction-time task were dependent upon the time of stimulus onset, the beat-to-beat measures were converted into time-based (Porges et aI., 1981). Successive Soo-msec intervals were established, and an estimate of heart period for each interval was computed as the sum of each heart period that occupied or partially occupied the interval, multiplied by the proportion of the interval that it occupied (see Cheung & Porges, 1977). Respiration amplitude was sampled at Soo-msec intervals.…”

Section: Quaadficadou Of the Datamentioning

confidence: 99%

Individual differences in respiratory-heart period coupling and heart period responses during two attention-demanding tasks

Porges

Coles

1982

Psychobiology

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Respiratory-heart period coupling was assessed via the weighted coherence (Cw) statistic derived from cross-spectral analysis and was related to physiological response patterns during two attention-demanding tasks. Subjects with a high coherence responded with significantly larger heart period decelerations at the time of the imperative stimulus in a reaction-time task. Peak deceleration of the low-coherence subjects exhibited more temporal variability. In a vigilance task, individual differences in coherence assessed prior to task manipulations were maintained during the task and significantly decreased during the task. Individual differences in coherence between and within sessions were stable, whereas corresponding analyses for heart period, heart period variance, and spontaneous electrodermal activity reflected only significant within-session correlations. The data suggest that individual differences in respiratory-heart period coherence are stable and are related to phasic cardiac responses in a reaction-time task.

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Respiratory influences on cardiac responses during attention

Cited by 53 publications

References 8 publications

Vagal tone during quiet sleep in normal human term fetuses

Vagal tone during quiet sleep in normal human term fetuses

Voluntary Breath Holding in Panic and Generalized Anxiety Disorders

Individual differences in respiratory-heart period coupling and heart period responses during two attention-demanding tasks

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