The influence of low-frequency magnetic field on plasma antioxidant capacity and heart rate.

PAPER pubmed Wiadomosci lekarskie (Warsaw, Poland : 1960) 2009 Animal study Effect: mixed Evidence: Low

Read original paper → PMID: 20141054 Evidence Lab

Abstract

INTRODUCTION: Low-frequency magnetic field is widely applied as magnetotherapy in physiotherapeutic treatment. Recognition of positive and negative effects of the magnetic field has been the subject of numerous studies. Experimental studies concern, among others, the effect of this field on the heart rate and plasma antioxidant capacity. The aim of the study was to check whether a time-variable magnetic field of constant frequency and induction affects the heart rate and plasma antioxidant capacity. MATERIAL AND METHODS: The tests were performed on Spraque-Dawley rats exposed to the magnetic field of the following parameters: frequency - 40 Hz, induction - 7 mT, time of exposure - 30 and 60 minutes. The measurements of ECG and plasma antioxidant capacity expressed in the number of reduced iron ions were performed on experimental animals: before, after a single exposure and after 14 days of exposure. RESULTS: A significant decrease of the heart rate was observed after 14 days of exposure. A variable magnetic field of the parameters: frequency - 40 Hz, induction - 7 mT and exposure time of 14 days caused an increase of the organism antioxidant defence, whereas a variable magnetic field of the frequency of 40 Hz, induction - 7 mT and exposure time 60 minutes for 14 days caused a significant decrease of the organism antioxidant defence. CONCLUSIONS: The exposure time affects heart rate, plasma antioxidant capacity and the organism defense ability against free radicals.

AI evidence extraction

At a glance

Study type

Animal study

Effect direction

mixed

Population

Sprague-Dawley rats

Sample size

—

Exposure

ELF magnetotherapy (time-variable magnetic field exposure) · 4.0E-5 MHz · 30 or 60 minutes; assessed after single exposure and after 14 days of exposure

Evidence strength

Low

Confidence: 74% · Peer-reviewed: yes

Main findings

After 14 days of exposure, heart rate significantly decreased. Antioxidant defense increased with 40 Hz, 7 mT exposure over 14 days, but with 60 minutes exposure for 14 days there was a significant decrease in antioxidant defense.

Outcomes measured

heart rate (ECG)
plasma antioxidant capacity (reduced iron ions)
organism antioxidant defence/defense ability against free radicals

Limitations

Sample size not reported in abstract
Exposure regimen details (e.g., daily schedule over 14 days) not fully described in abstract
Outcome measurement methods beyond brief descriptors not detailed

Suggested hubs

el f-magnetic-fields (0.78)
Animal study of a 40 Hz (ELF) magnetic field exposure and physiological/oxidative outcomes.

View raw extracted JSON

{
    "study_type": "animal",
    "exposure": {
        "band": "ELF",
        "source": "magnetotherapy (time-variable magnetic field exposure)",
        "frequency_mhz": 4.00000000000000032721221565612523818344925530254840850830078125e-5,
        "sar_wkg": null,
        "duration": "30 or 60 minutes; assessed after single exposure and after 14 days of exposure"
    },
    "population": "Sprague-Dawley rats",
    "sample_size": null,
    "outcomes": [
        "heart rate (ECG)",
        "plasma antioxidant capacity (reduced iron ions)",
        "organism antioxidant defence/defense ability against free radicals"
    ],
    "main_findings": "After 14 days of exposure, heart rate significantly decreased. Antioxidant defense increased with 40 Hz, 7 mT exposure over 14 days, but with 60 minutes exposure for 14 days there was a significant decrease in antioxidant defense.",
    "effect_direction": "mixed",
    "limitations": [
        "Sample size not reported in abstract",
        "Exposure regimen details (e.g., daily schedule over 14 days) not fully described in abstract",
        "Outcome measurement methods beyond brief descriptors not detailed"
    ],
    "evidence_strength": "low",
    "confidence": 0.7399999999999999911182158029987476766109466552734375,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "extremely low frequency",
        "ELF magnetic field",
        "magnetotherapy",
        "40 Hz",
        "7 mT",
        "Sprague-Dawley rats",
        "heart rate",
        "ECG",
        "plasma antioxidant capacity",
        "oxidative stress",
        "free radicals"
    ],
    "suggested_hubs": [
        {
            "slug": "el f-magnetic-fields",
            "weight": 0.7800000000000000266453525910037569701671600341796875,
            "reason": "Animal study of a 40 Hz (ELF) magnetic field exposure and physiological/oxidative outcomes."
        }
    ]
}

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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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