Heart rate variability in healthy young adults exposed to global system for mobile communication (GSM) 900- MHz radiofrequency signal from mobile phones

Abstract

Heart rate variability in healthy young adults exposed to global system for mobile communication (GSM) 900- MHz radiofrequency signal from mobile phones Jasmina Wallace, Soafara Andrianome, Rania Ghosn, Erwan Stephan Blanchard, Frederic Telliez, Brahim Selmaoui. Heart rate variability in healthy young adults exposed to global system for mobile communication (GSM) 900-MHz radiofrequency signal from mobile phones. Environ Res. 2020 Aug 23;191:110097. doi: 10.1016/j.envres.2020.110097. Abstract Given the large number of mobile phone users and the increasing exposure to radiofrequency electromagnetic field (RF-EMF) worldwide, we aimed to study the effect of RF-EMF related to mobile phones on heart rate variability (HRV). Twenty-six healthy young adults participated in two experimental sessions with a double-blind, randomized and counter-balanced crossover design. During each session, participants were exposed for 26 min to a sham or real 900 MHz RF-EMF, generated by a commercial dual-band Global System for Mobile technology (GSM) mobile phone. We recorded an electrocardiogram at rest during the exposure. We evaluated HRV by time- and frequency-domain analysis. Evaluation of time-domain HRV parameters revealed a statistically significant increase of the standard deviation of interbeat intervals (SDNN) during the real exposure. Other time- domain parameters were not affected. Analysis in the frequency-domain demonstrated that total spectral power and low-frequency band (LF) absolute power were significantly increased during exposure (p = .046 and p = .043, respectively). However, other parameters were not affected. In conclusion, it seems that most HRV parameters were not affected by GSM signal exposure in our study. The weak effect observed on HRV frequency-domain is likely to represent a random occurrence rather than a real effect. pubmed.ncbi.nlm.nih.gov

AI evidence extraction

Main findings

In a double-blind randomized counter-balanced crossover experiment (real vs sham), SDNN increased during real 900 MHz GSM exposure. Total spectral power and LF absolute power were also significantly increased during exposure, while most other HRV parameters were not affected; authors suggest the weak frequency-domain effect may be a random occurrence rather than a real effect.

Outcomes measured

• heart rate variability (HRV)
• SDNN (standard deviation of interbeat intervals)
• total spectral power
• low-frequency (LF) absolute power

Limitations

• Small sample size (n=26)
• Short exposure duration (26 min)
• Most HRV parameters not affected; observed effects described as weak and possibly random by authors

Suggested hubs

• mobile-phones (0.95)
  Exposure was generated by a commercial GSM mobile phone (900 MHz) in a sham-controlled crossover design.

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    "exposure": {
        "band": "RF",
        "source": "mobile phone",
        "frequency_mhz": 900,
        "sar_wkg": null,
        "duration": "26 min"
    },
    "population": "Healthy young adults",
    "sample_size": 26,
    "outcomes": [
        "heart rate variability (HRV)",
        "SDNN (standard deviation of interbeat intervals)",
        "total spectral power",
        "low-frequency (LF) absolute power"
    ],
    "main_findings": "In a double-blind randomized counter-balanced crossover experiment (real vs sham), SDNN increased during real 900 MHz GSM exposure. Total spectral power and LF absolute power were also significantly increased during exposure, while most other HRV parameters were not affected; authors suggest the weak frequency-domain effect may be a random occurrence rather than a real effect.",
    "effect_direction": "mixed",
    "limitations": [
        "Small sample size (n=26)",
        "Short exposure duration (26 min)",
        "Most HRV parameters not affected; observed effects described as weak and possibly random by authors"
    ],
    "evidence_strength": "low",
    "confidence": 0.7800000000000000266453525910037569701671600341796875,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "GSM",
        "900 MHz",
        "radiofrequency",
        "RF-EMF",
        "mobile phone",
        "heart rate variability",
        "HRV",
        "SDNN",
        "spectral power",
        "low frequency"
    ],
    "suggested_hubs": [
        {
            "slug": "mobile-phones",
            "weight": 0.9499999999999999555910790149937383830547332763671875,
            "reason": "Exposure was generated by a commercial GSM mobile phone (900 MHz) in a sham-controlled crossover design."
        }
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}

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