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Cardiovascular

Effects of RF fields emitted from smart phones on cardio-respiratory parameters: a preliminary provocation study.

No Effects Found

Kwon MK, Nam KC, Lee da S, Jang KH, Kim DW. · 2011

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Thirty minutes of smartphone RF exposure showed no immediate heart or breathing changes in this small study of 20 people.

Plain English Summary

Summary written for general audiences

Researchers exposed 20 people (10 who claimed electromagnetic hypersensitivity and 10 who didn't) to smartphone radiofrequency radiation at 1950 MHz for 30 minutes in a controlled, double-blind study. They monitored heart and breathing patterns during exposure but found no measurable changes in either group. This suggests that short-term smartphone RF exposure at typical levels doesn't immediately affect basic cardiovascular or respiratory functions.

Why This Matters

This small provocation study adds to our understanding of acute EMF effects, particularly for people who report electromagnetic hypersensitivity (EHS). The SAR level of 1.57 W/kg is actually above current smartphone limits in many countries, making this a reasonably robust exposure test. However, the study's limitations are significant: only 20 participants, just 30 minutes of exposure, and measurement of only basic physiological parameters. What this research doesn't tell us is equally important. Thirty minutes doesn't reflect real-world smartphone usage patterns where people are exposed for hours daily over years. The study also didn't examine more subtle biological markers like stress hormones, inflammatory responses, or cellular changes that other research has documented. While these results suggest no immediate cardio-respiratory crisis from smartphone use, they shouldn't be interpreted as proof that RF exposure is entirely benign.

Exposure Details

SAR
1.57 W/kg
Source/Device
1950 MHz
Exposure Duration
30 minutes

Exposure Context

This study used 1.57 W/kg for SAR (device absorption):

Building Biology guidelines are practitioner-based limits from real-world assessments. BioInitiative Report recommendations are based on peer-reviewed science. Check Your Exposure to compare your own measurements.

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 1.57 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Extreme Concern range (Building Biology)FCC limit is 1 times higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 1.95 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 1.95 GHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

The aim of this study is to investigate Effects of RF fields emitted from smart phones on cardio-respiratory parameters: a preliminary provocation study.

This paper describes an experimental setup for evaluating the physiological effects of radiofrequenc...

In the preliminary results, WCDMA RF exposure of 30 min did not have any effects on physiological ch...

Cite This Study
Kwon MK, Nam KC, Lee da S, Jang KH, Kim DW. (2011). Effects of RF fields emitted from smart phones on cardio-respiratory parameters: a preliminary provocation study. Conf Proc IEEE Eng Med Biol Soc. 2011:1961-1964, 2011.
Show BibTeX
@article{mk_2011_effects_of_rf_fields_3163,
  author = {Kwon MK and Nam KC and Lee da S and Jang KH and Kim DW.},
  title = {Effects of RF fields emitted from smart phones on cardio-respiratory parameters: a preliminary provocation study.},
  year = {2011},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/22254717/},
}
PubMed: 22254717

Cited By (4 papers)

Quick Questions About This Study

A 2011 controlled study found that 30 minutes of 1950 MHz smartphone radiation exposure caused no measurable changes in heart rate or breathing patterns. Researchers tested 20 people in a double-blind study and detected no immediate cardiovascular or respiratory effects from typical smartphone RF levels.
Research shows people claiming electromagnetic hypersensitivity cannot actually detect 1950 MHz smartphone signals. A double-blind study exposed both sensitive and non-sensitive individuals to this frequency for 30 minutes, finding no physiological differences between groups during RF exposure.
A controlled study using 1950 MHz smartphone radiation found no bodily effects after 30 minutes of continuous exposure. Researchers monitored heart and breathing functions throughout the exposure period but detected no immediate physiological changes in any participants.
Studies on 3G WCDMA radiation at 1950 MHz show no immediate heart risks. A 2011 double-blind study exposed 20 people to this frequency for 30 minutes while monitoring cardiovascular function, finding no measurable effects on heart rate or rhythm.
Research demonstrates that 1950 MHz smartphone radiation does not cause immediate health symptoms. A controlled study monitored people during 30-minute exposures to this frequency, measuring heart and breathing functions, but found no acute physiological responses in any participants.