What is the clinical evidence from this study?

Study design: Observational. Population: Normal subjects (n=5). Intervention: Cardiovascular reflex testing (sustained handgrip and cold pressor tests) vs. Rest. Primary outcome: Reproducibility of systolic blood pressure and power spectral measures (coefficients of variation).

What question did this study set out to answer?

To evaluate the intra-individual reproducibility of standard blood pressure responses and power spectral heart rate variability indices during sympathetic cardiovascular reflex tests.

September 1, 1996Clinical and Experimental Pharmacology and Physiology

Reproducibility of Conventional and Power Spectral Measurements of Cardiovascular Sympathetic Activation in Normal Subjects

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Key result

Power spectral measurements of cardiovascular sympathetic activation showed low intra-individual reproducibility, with coefficients of variation up to 80% during sympathetic stimulation.

Why the study?

Does cardiovascular reflex testing yield reproducible power spectral measurements of sympathetic activation in normal subjects?

Key Points

To evaluate the intra-individual reproducibility of standard blood pressure responses and power spectral heart rate variability indices during sympathetic cardiovascular reflex tests.
Assessed 5 healthy volunteers (aged 20–42 years; baseline blood pressure 116 ± 21 / 61 ± 11 mmHg) on five separate occasions using sustained handgrip and cold pressor challenges.
Recorded continuous non-invasive systolic blood pressure (SBP) and heart period (RRINT), applying fast Fourier transforms to calculate high-frequency and low-frequency power spectral density at rest, during stimulation, and 2 minutes post-stimulus.
Systolic blood pressure increased significantly with both handgrip and cold pressor challenges; the low-frequency/high-frequency ratio of heart period rose significantly only with handgrip, while low-frequency percentage of SBP showed no significant changes.
Power spectral measurements demonstrated low intra-individual reproducibility, yielding resting coefficients of variation between 25% and 41% that escalated up to 80% during sympathetic stimulation.

Study Design

Type

Observational (n=5)

Structured PICO

Does cardiovascular reflex testing yield reproducible power spectral measurements of sympathetic activation in normal subjects?

Population

5 normal subjects aged 20-42 years who underwent cardiovascular reflex testing five times each.

Exposure

Cardiovascular reflex testing (sustained handgrip and cold pressor tests) performed five times each, with continuous non-invasive SBP and heart period data analyzed using fast Fourier transforms.

Comparator

Rest and recovery periods.

Outcome

Intra-individual reproducibility of systolic blood pressure (SBP) responses and power spectral (PS) density estimates (HF%, LF/HF, LF%) at rest, during, and 2 min after stimuli.surrogate

Power spectral methods show high intra-individual variability and may not be suitable for analyzing transient cardiovascular reflexes.

Discussion

No takes yet. Share an insight, caveat, or question.

Implication

May not suit transient reflex testing clinically; leaves open group-level research applications pending better standardization.

Cite This Study

Taverner et al. (1996) conducted an observational in Normal subjects (n=5). Cardiovascular reflex testing (sustained handgrip and cold pressor tests) vs. Rest was evaluated on Reproducibility of systolic blood pressure and power spectral measures (coefficients of variation). Power spectral measurements of cardiovascular sympathetic activation showed low intra-individual reproducibility, with coefficients of variation up to 80% during sympathetic stimulation.

synapsesocial.com/papers/6a9c754b5c1d58183bebedc4 https://doi.org/10.1111/j.1440-1681.1996.tb01183.x

View Full Paper

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Reproducibility of Conventional and Power Spectral Measurements of Cardiovascular Sympathetic Activation in Normal Subjects

Key Points

Study Design

Structured PICO

Discussion

Implication

Cite This Study

Reproducibility of Conventional and Power Spectral Measurements of Cardiovascular Sympathetic Activation in Normal Subjects

Key Points

Study Design

Structured PICO

Discussion

Implication

Cite This Study

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