What question did this study set out to answer?

To determine the impact of hyperbaric exposure and subsequent decompression on time- and frequency-domain estimators of heart rate variability.

March 1, 2018Undersea and Hyperbaric Medicine

Heart rate variability changes as an indicator of decompression-related physiological stress

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Why the study?

Does a simulated dive to 557 KPa alter heart rate variability in subjects compared to a normobaric control?

Population

Subjects (sample size and demographics not stated)

Comparison

Simulated dive to 557 KPa for a 30-minute bottom… vs Control group submitted to the same protocol…

Design

Other

Follow-up

1 hour post-dive

Authors

SSSérgio Rhein SchiratoUniversidade de São Paulo IEIngrid El-DashPennsylvania State University VEVivian El-DashUniversidade de São Paulo

Discussion

Member takes

Implication

Blunted post-dive parasympathetic HRV recovery signals hyperbaric stress; leaves open whether HRV tracks decompression risk in divers.

Key Points

To determine the impact of hyperbaric exposure and subsequent decompression on time- and frequency-domain estimators of heart rate variability.
Subjects underwent a simulated dive to 557 kPa (45 meters of sea water) for a 30-minute bottom time or served as normobaric controls breathing the same gas mixtures.
Surface electrocardiogram monitoring was performed for 30 minutes pre-dive and 60 minutes post-dive, subdivided into 256 consecutive R-R interval windows for heart rate variability analysis.
Control subjects exhibited significant increases in SDNN, RMSSD, and both high-frequency and low-frequency power spectrum bands.
Simulated dive subjects demonstrated an isolated increase in low-frequency heart rate variability without significant changes in high-frequency power or other time-domain metrics.

Structured PICO

Does a simulated dive to 557 KPa alter heart rate variability in subjects compared to a normobaric control?

Population

Subjects (sample size and demographics not stated)

Intervention

Simulated dive to 557 KPa (45 meters of salt water) for a 30-minute bottom time

Comparator

Control group submitted to the same protocol, breathing the same gases, but not exposed to the hyperbaric environment

Outcome

Frequency and time domains estimators of heart rate variability (HRV) measured for 30 minutes before and one hour after the divesurrogate

Decompression-related physiological stress from a simulated dive alters autonomic balance, indicated by an isolated increase in low-frequency heart rate variability.

Cite This Study

Schirato et al. (2018) studied this question.

synapsesocial.com/papers/6a720722fe4101aa97e0bea1 https://doi.org/10.22462/03.04.2018.4

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