What is the clinical evidence from this study?

Study design: Other. Population: Healthy (n=22). Intervention: Mental stress, relaxation, and mild physical exercise with different breathing conditions. Primary outcome: Changes in respiratory sinus arrhythmia (RSA).

What does this research mean for the field?

Changes in tonic vagal modulation, central respiratory drive, respiratory depth, and respiratory frequency independently contribute to changes in respiratory sinus arrhythmia, and RSA should be corrected for respiratory parameters when central respiratory drive is expected to change. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

July 1, 2002

Contribution of tonic vagal modulation of heart rate, central respiratory drive, respiratory depth, and respiratory frequency to respiratory sinus arrhythmia during mental stress and physical exercise

Resultado clave

Changes in tonic vagal modulation, central respiratory drive, respiratory depth, and respiratory frequency independently contributed to changes in respiratory sinus arrhythmia.

PICO estructurado

Do different experimental conditions (mental stress, relaxation, physical exercise) and breathing patterns alter respiratory sinus arrhythmia in healthy participants?

Población

22 healthy participants

Intervención

Three experimental conditions (mental stress, relaxation, and mild physical exercise) each consisting of three breathing parts (normal breathing, breathing compressed room air, and breathing compressed 5% CO2-enriched air)

Comparador

Within-subject comparison across different experimental and breathing conditions

Resultado

Changes in respiratory sinus arrhythmia (RSA)surrogate

Uncorrected respiratory sinus arrhythmia (RSA) is sufficient to index within-subject changes in tonic vagal modulation of heart rate in most situations, but should be corrected for PaCO2, respiratory depth, and frequency if central respiratory drive changes.

Resumen

This study tested various sources of changes in respiratory sinus arrhythmia (RSA). Twenty-two healthy participants participated in three experimental conditions (mental stress, relaxation, and mild physical exercise) that each consisted of three breathing parts (normal breathing, breathing compressed room air, and breathing compressed 5% CO2-enriched air). Independent contributions to changes in RSA were found for changes in tonic vagal modulation of heart rate, central respiratory drive (i.e., PaCO2), respiratory depth, and respiratory frequency. The relative contributions to changes in RSA differed for mental stress and physical exercise. It is concluded that uncorrected RSA will suffice to index within-subject changes in tonic vagal modulation of heart rate in most situations. However, if the central respiratory drive is expected to change, RSA should ideally be corrected for changes in PaCO2, respiratory depth, and respiratory frequency.

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