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Does Heart Rate Variability Predict Impairment of Operational Performance in Divers?
John Freiberger1, Bruce Derrick1,2, Ki H Chon3
1Department of Anesthesiology, Duke University, Durham, NC 27708, USA.
Sensors (Basel, Switzerland)
|December 17, 2024
Summary
Heart rate variability (HRV) can signal cognitive impairment in divers. Specific HRV features, like normalized high-frequency HRV (HFnu) and NN50count1, correlated with performance decrements during simulated dives under narcotizing conditions.
Area of Science:
- Physiological monitoring
- Diving medicine
- Cognitive science
Background:
- Diving gas narcosis and oxygen toxicity can impair cognitive function.
- Heart rate variability (HRV) is a potential non-invasive indicator of physiological stress.
- Previous research has explored HRV's utility in various performance contexts.
Purpose of the Study:
- To validate heart rate variability (HRV) as a predictive measure for cognitive impairment in divers.
- To identify specific HRV features associated with cognitive changes during simulated diving conditions.
- To assess the impact of hypercapnia, nitrogen, and oxygen on diver performance and HRV.
Main Methods:
- Analysis of data from Naval Sea Systems Command grant project N0463A-12-C-001.
- Comparison of 23 distinct HRV features with cognitive performance outcomes using NASA's multi-attribute task battery (MATB-II).
- Assessment of diver performance at simulated depths up to 61 msw under varying gas partial pressures and exercise levels.
Main Results:
- Performance decrements were linked to normalized high-frequency HRV (HFnu) and NN50count1 during simulated dives.
- In non-exercise conditions, HRV parameters such as RMSSD, Poincaré plot width, NN50count1, and SDNN were associated with performance impairment.
- The association between RMSSD and performance impairment remained significant after Bonferroni correction.
Conclusions:
- Specific HRV features can serve as warning signs for cognitive impairment in divers.
- HRV monitoring may offer a valuable tool for enhancing diver safety and performance assessment.
- Findings support the use of HRV analysis in operational diving environments to detect physiological stress and cognitive changes.
Keywords:
MATB-IISMOTEanesthesiologycarbon dioxidecognitive impairmentcognitive testingdivingflight simulatorheart rate variabilityhypercapniahyperoxiainert gask-nearest neighbor classifiermissionnarcosisnavynitrogenoxygen toxicityrandom forestrapture of the deepsupport vector machineunderseaunderwater breathingMore Related Videos
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