What question did this study set out to answer?

To determine whether the coupling dynamics between spontaneous fluctuations in heart period and systolic blood pressure vary across wake-sleep states in humans.

February 14, 2008AJP Regulatory Integrative and Comparative Physiology

Sleep-dependent changes in the coupling between heart period and blood pressure in human subjects

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Why the study?

Does the pattern of coupling between heart period and systolic blood pressure differ among wake-sleep states in healthy adults?

Population

15 nonobese adults without sleep-disordered breathing

Design

Cross-sectional

Follow-up

48 h

Authors

ASAlessandro SilvaniOspedale "Santa Maria delle Croci" di Ravenna DGDaniela GrimaldiNorthwestern University SVStefano VandiThe Federal Polytechnic, Ado-Ekiti

Discussion

Member takes

Implication

Reinforces sleep-stage specificity of baroreflex activity; leaves open translation to cardiovascular risk prediction or management.

Key Points

To determine whether the coupling dynamics between spontaneous fluctuations in heart period and systolic blood pressure vary across wake-sleep states in humans.
Monitored 15 nonobese adults without sleep-disordered breathing over 48 hours using polysomnography and continuous finger arterial blood pressure recording.
Computed the cross-correlation function (CCF) between low-frequency (<0.15 Hz) fluctuations in heart period and systolic blood pressure across quiet wakefulness, light NREMS, deep NREMS, and REMS.
A positive correlation between heart period and preceding systolic blood pressure—reflecting baroreflex feedback—occurred exclusively during sleep states and peaked significantly in deep NREMS compared to all other states.
A negative correlation between heart period and subsequent systolic blood pressure—representing feed-forward mechanical and central autonomic effects—was significantly attenuated in deep NREMS compared to light NREMS and quiet wakefulness.

Structured PICO

Does the pattern of coupling between heart period and systolic blood pressure differ among wake-sleep states in healthy adults?

Population

15 nonobese adults without sleep-disordered breathing

Intervention

Observation during quiet wakefulness (QW), light (stages 1 and 2) and deep (stages 3 and 4) nonrapid-eye-movement sleep (NREMS), and rapid-eye-movement sleep (REMS)

Outcome

Cross-correlation function (CCF) between the fluctuations of heart period (HP) and systolic blood pressure (SBP) at frequencies <0.15 Hzsurrogate

The coupling between heart period and blood pressure varies significantly across sleep states, with deep NREM sleep showing the strongest baroreflex feedback control.

Cite This Study

Silvani et al. (2008) studied this question.

synapsesocial.com/papers/6a708d57a528af2d65c3999e https://doi.org/10.1152/ajpregu.00756.2007

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Sleep-dependent changes in the coupling between heart period and blood pressure in human subjects

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Sleep-dependent changes in the coupling between heart period and blood pressure in human subjects

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Also Consider

Also Consider