Geomagnetic storm under laboratory conditions: randomized experiment

Abstract

Geomagnetic storm under laboratory conditions: randomized experiment Oleg Grigoriev, Chairman of the Russian National Committee on Non-Ionizing Radiation Protection, sent me the following paper after I disseminated the study above: Gurfinkel YI, Vasin AL, Pishchalnikov RY, Sarimov RM, Sasonko ML, Matveeva TA. Geomagnetic storm under laboratory conditions: randomized experiment. Int J Biometeorol. 2018 Apr;62(4):501-512. doi: 10.1007/s00484- 017-1460-8. Abstract The influence of the previously recorded geomagnetic storm (GS) on human cardiovascular system and microcirculation has been studied under laboratory conditions. Healthy volunteers in lying position were exposed under two artificially created conditions: quiet (Q) and storm (S). The Q regime playbacks a noise-free magnetic field (MF) which is closed to the natural geomagnetic conditions on Moscow's latitude. The S regime playbacks the initially recorded 6-h geomagnetic storm which is repeated four times sequentially. The cardiovascular response to the GS impact was assessed by measuring capillary blood velocity (CBV) and blood pressure (BP) and by the analysis of the 24-h ECG recording. A storm-to-quiet ratio for the cardio intervals (CI) and the heart rate variability (HRV) was introduced in order to reveal the average over group significant differences of HRV. An individual sensitivity to the GS was estimated using the autocorrelation function analysis of the high-frequency (HF) part of the CI spectrum. The autocorrelation analysis allowed for detection a group of subjects of study which autocorrelation functions (ACF) react differently in the Q and S regimes of exposure. ncbi.nlm.nih.gov

AI evidence extraction

Main findings

Under laboratory conditions, volunteers were exposed to a quiet magnetic field regime approximating natural geomagnetic conditions and to a storm regime replaying a previously recorded 6-hour geomagnetic storm repeated four times. Cardiovascular and microcirculation responses were assessed via CBV, BP, and 24-hour ECG-derived CI/HRV metrics, and autocorrelation analysis of the HF CI spectrum was used to identify a subgroup whose ACF reacted differently between quiet and storm exposures.

Outcomes measured

• capillary blood velocity (CBV)
• blood pressure (BP)
• 24-h ECG recording
• cardio intervals (CI)
• heart rate variability (HRV)
• high-frequency (HF) part of CI spectrum
• autocorrelation function (ACF) response (individual sensitivity)

Limitations

• Sample size not reported in provided abstract/metadata
• No quantitative results or statistical significance values reported in provided abstract/metadata
• Exposure intensity/field strength parameters not reported in provided abstract/metadata
• Randomization details and blinding not described in provided abstract/metadata

Suggested hubs

• occupational-exposure (0.2)
  Laboratory exposure study of magnetic-field conditions; not clearly occupational but relates to controlled exposure assessment.

{
    "study_type": "randomized_trial",
    "exposure": {
        "band": null,
        "source": "geomagnetic storm (artificially created magnetic field playback)",
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": "6-h geomagnetic storm repeated four times sequentially; 24-h ECG recording"
    },
    "population": "Healthy volunteers",
    "sample_size": null,
    "outcomes": [
        "capillary blood velocity (CBV)",
        "blood pressure (BP)",
        "24-h ECG recording",
        "cardio intervals (CI)",
        "heart rate variability (HRV)",
        "high-frequency (HF) part of CI spectrum",
        "autocorrelation function (ACF) response (individual sensitivity)"
    ],
    "main_findings": "Under laboratory conditions, volunteers were exposed to a quiet magnetic field regime approximating natural geomagnetic conditions and to a storm regime replaying a previously recorded 6-hour geomagnetic storm repeated four times. Cardiovascular and microcirculation responses were assessed via CBV, BP, and 24-hour ECG-derived CI/HRV metrics, and autocorrelation analysis of the HF CI spectrum was used to identify a subgroup whose ACF reacted differently between quiet and storm exposures.",
    "effect_direction": "mixed",
    "limitations": [
        "Sample size not reported in provided abstract/metadata",
        "No quantitative results or statistical significance values reported in provided abstract/metadata",
        "Exposure intensity/field strength parameters not reported in provided abstract/metadata",
        "Randomization details and blinding not described in provided abstract/metadata"
    ],
    "evidence_strength": "low",
    "confidence": 0.66000000000000003108624468950438313186168670654296875,
    "peer_reviewed_likely": "unknown",
    "keywords": [
        "geomagnetic storm",
        "magnetic field",
        "laboratory exposure",
        "randomized experiment",
        "cardiovascular system",
        "microcirculation",
        "capillary blood velocity",
        "blood pressure",
        "ECG",
        "heart rate variability",
        "autocorrelation"
    ],
    "suggested_hubs": [
        {
            "slug": "occupational-exposure",
            "weight": 0.200000000000000011102230246251565404236316680908203125,
            "reason": "Laboratory exposure study of magnetic-field conditions; not clearly occupational but relates to controlled exposure assessment."
        }
    ]
}

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