Effect of low pulsed microwaves on heart rate variability signals in mammals.

PAPER pubmed Neurosciences (Riyadh, Saudi Arabia) 2001 Animal study Effect: harm Evidence: Low

Read original paper → PMID: 24185220 Evidence Lab

Abstract

OBJECTIVE: The main objective of this work is to study the effect of low pulsed microwaves on the heart rate variability signals derived from electrocardiogram signals of ten cats irradiated with pulsed microwaves with 5.655GHz. METHODS: Electrocardiograms of ten anaesthetized cats were measured and recorded using implanted electrodes before microwave exposure. Rectangular pulses at 5.655GHz, 2 w peak, 5.5us wide and repetition rate 2 Hz were applied to the brain of cats through horns and wave guides for 20 minutes, followed by a 20 minute recovery period after exposure. RESULTS: The results clearly indicate that the pulsed microwaves radiation induced high fluctuations in power spectra of heart rate variability signals specially in the band of 8s to 80s.(0.0125 Hz to 0.125Hz) which is related to the thermoregulatory control activity. Examining the power spectra of heart rate variability of recovery period(after 20 minutes microwave exposure) shows that the change of power spectra of heart rate variability signal during microwave exposure is not permanent. CONCLUSION: The analysis of power spectra of heart rate variability signals of ten anaesthetized cats before, during and after exposure to low power microwave radiation seems useful to indicate the interaction of pulsed microwaves with cardiovascular system, autonomic function and body control mechanism.

AI evidence extraction

At a glance

Study type

Animal study

Effect direction

harm

Population

Ten anaesthetized cats

Sample size

Exposure

microwave · 5655 MHz · 20 minutes exposure + 20 minutes recovery

Evidence strength

Low

Confidence: 74% · Peer-reviewed: yes

Main findings

Pulsed microwave exposure (5.655 GHz) was associated with high fluctuations in HRV power spectra, particularly in the 8–80 s (0.0125–0.125 Hz) band related to thermoregulatory control activity. During the recovery period after exposure, HRV power spectra changes observed during exposure were reported as not permanent.

Outcomes measured

Heart rate variability (HRV) power spectra fluctuations
Thermoregulatory-related HRV band (8–80 s; 0.0125–0.125 Hz)

Limitations

No SAR or absorbed dose metrics reported
Small sample size (n=10)
Animal study (anaesthetized cats), limiting generalizability to humans
Exposure described as applied to the brain; whole-body exposure characterization not provided

View raw extracted JSON

{
    "study_type": "animal",
    "exposure": {
        "band": "microwave",
        "source": null,
        "frequency_mhz": 5655,
        "sar_wkg": null,
        "duration": "20 minutes exposure + 20 minutes recovery"
    },
    "population": "Ten anaesthetized cats",
    "sample_size": 10,
    "outcomes": [
        "Heart rate variability (HRV) power spectra fluctuations",
        "Thermoregulatory-related HRV band (8–80 s; 0.0125–0.125 Hz)"
    ],
    "main_findings": "Pulsed microwave exposure (5.655 GHz) was associated with high fluctuations in HRV power spectra, particularly in the 8–80 s (0.0125–0.125 Hz) band related to thermoregulatory control activity. During the recovery period after exposure, HRV power spectra changes observed during exposure were reported as not permanent.",
    "effect_direction": "harm",
    "limitations": [
        "No SAR or absorbed dose metrics reported",
        "Small sample size (n=10)",
        "Animal study (anaesthetized cats), limiting generalizability to humans",
        "Exposure described as applied to the brain; whole-body exposure characterization not provided"
    ],
    "evidence_strength": "low",
    "confidence": 0.7399999999999999911182158029987476766109466552734375,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "pulsed microwaves",
        "microwave radiation",
        "5.655 GHz",
        "heart rate variability",
        "electrocardiogram",
        "power spectra",
        "thermoregulation",
        "autonomic function",
        "cats"
    ],
    "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract/metadata and may be incomplete or incorrect. This content is for informational purposes only and is not medical advice.

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