Analysis of the mobile phone effect on the heart rate variability by using the largest Lyapunov exponent.

Journal of medical systems · 2010 · Mixed · Very low evidence

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MixedVery low evidencePaper 4419

In a blind protocol, LLE values of HRV increased slightly under higher EMF conditions from a GSM900 mobile phone (pre-ring handshaking/ringing) compared with very low EMF (stand-by) (P<0.05). The authors interpret this as increased chaos/complexity in HRV sig…

Study snapshot

PublicationJournal of medical systems · 2010

Study typeother

Reported directionMixed

Evidence ratingVery low

Abstract

In this study, the effects of electromagnetic fields (EMFs) emitted by GSM900 based mobile phones (MPs) on the heart rate variability (HRV) were examined by using nonlinear analysis methods. The largest Lyapunov exponent (LLE) calculation was used to evaluate the effect of MP under various real exposure conditions. Sixteen healthy young volunteers were exposed to EMFs emitted by GSM900 based MP at two levels from a very low EMF (MP at stand-by) to a higher EMF (MP at pre-ring handshaking and ringing). A blind experimental protocol was designed and utilized with consideration to the physiological and psychological factors that may affect HRV. The results showed that the LLE values increased slightly with higher EMF produced by MP (P < 0.05). This change indicates that the degree of chaos in the HRV signals increased at higher EMF compared to low level EMF. Consequently, we have concluded that high level EMF changed the complexity of cardiac system behavior, significantly.

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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 typeother

Effect directionmixed

PopulationSixteen healthy young volunteers

Sample size16

ExposureRF · 900 MHz

Evidence strengthVery lowConfidence: 74% · Peer reviewed: yes

Main findings

Outcomes measured

Heart rate variability (HRV)
Largest Lyapunov exponent (LLE) of HRV signals (nonlinear/chaos measure)

Limitations

Exposure metrics beyond qualitative levels (e.g., SAR) not reported in the abstract
Small sample size (n=16)
Duration of exposure not reported in the abstract
Outcome is a nonlinear HRV metric (LLE); clinical significance not stated in the abstract

View raw extracted JSON

{
  "study_type": "other",
  "exposure": {
    "band": "RF",
    "source": "mobile phone",
    "frequency_mhz": 900,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Sixteen healthy young volunteers",
  "sample_size": 16,
  "outcomes": [
    "Heart rate variability (HRV)",
    "Largest Lyapunov exponent (LLE) of HRV signals (nonlinear/chaos measure)"
  ],
  "main_findings": "In a blind protocol, LLE values of HRV increased slightly under higher EMF conditions from a GSM900 mobile phone (pre-ring handshaking/ringing) compared with very low EMF (stand-by) (P<0.05). The authors interpret this as increased chaos/complexity in HRV signals at higher EMF exposure.",
  "effect_direction": "mixed",
  "limitations": [
    "Exposure metrics beyond qualitative levels (e.g., SAR) not reported in the abstract",
    "Small sample size (n=16)",
    "Duration of exposure not reported in the abstract",
    "Outcome is a nonlinear HRV metric (LLE); clinical significance not stated in the abstract"
  ],
  "evidence_strength": "very_low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "GSM900",
    "mobile phone",
    "electromagnetic fields",
    "RF",
    "heart rate variability",
    "largest Lyapunov exponent",
    "nonlinear analysis",
    "blind protocol"
  ],
  "suggested_hubs": []
}

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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: 10.1007/s10916-009-9328-z
PubMed: 20703598

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