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

Wiadomosci lekarskie (Warsaw, Poland : 1960) · 2009 · Mixed · Low evidence

← Research stream

MixedLow evidencePaper 3359

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.

Study snapshot

PublicationWiadomosci lekarskie (Warsaw, Poland : 1960) · 2009

Study typeanimal

Reported directionMixed

Evidence ratingLow

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.

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeanimal

Effect directionmixed

PopulationSprague-Dawley rats

Sample sizeNot supplied

ExposureELF · 4e-05 MHz · 30 or 60 minutes; assessed after single exposure and after 14 days of exposure

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

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

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "ELF",
    "source": "magnetotherapy (time-variable magnetic field exposure)",
    "frequency_mhz": 4e-05,
    "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": 0.74,
  "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": 0.78,
      "reason": "Animal study of a 40 Hz (ELF) magnetic field exposure and physiological/oxidative outcomes."
    }
  ]
}

AI can be wrong. Always verify against the paper.

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

Identifiers and source

DOI: Not supplied
PubMed: 20141054

Read the original paper →

Related papers

← Back to the Research Library