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  Table of Contents    
Year : 2022  |  Volume : 24  |  Issue : 112  |  Page : 28-29
Comments on the Article “Negative Effect of High-level Infrasound on Human Myocardial Contractility: in Vitro Controlled Experiment” by Chaban R. et al. (Noise Health 2021;23:57-66)

Mundonovo Sound Research, Baflo, the Netherlands, The Netherlands

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Date of Submission11-Oct-2021
Date of Decision13-Oct-2022
Date of Acceptance15-Oct-2022
Date of Web Publication26-May-2022
How to cite this article:
van den Berg F. Comments on the Article “Negative Effect of High-level Infrasound on Human Myocardial Contractility: in Vitro Controlled Experiment” by Chaban R. et al. (Noise Health 2021;23:57-66). Noise Health 2022;24:28-9

How to cite this URL:
van den Berg F. Comments on the Article “Negative Effect of High-level Infrasound on Human Myocardial Contractility: in Vitro Controlled Experiment” by Chaban R. et al. (Noise Health 2021;23:57-66). Noise Health [serial online] 2022 [cited 2023 Jan 27];24:28-9. Available from: https://www.noiseandhealth.org/text.asp?2022/24/112/28/345957

In their paper, Chaban et al.[1] show that the contraction force in a small sample of live heart tissue is significantly less when exposed to 16 Hz infrasound of 120 dB compared to no infrasound exposure; the difference at 110 dB is not significant. In their discussion, the authors relate this to possible effects of infrasound from wind turbines on residents, although at the same time declining responsibility for making this connection by stating “Whether or not wind turbines are, or will be, able to produce harmfully high levels of infrasound (….) remains out of the scope of this paper.” From a modest literature search, they could have concluded that it is not necessary to cause worry to residents near wind farms as their results simply do not apply to wind farm infrasound. One reason for this is that wind turbine infrasound levels are too low, and another is that their understanding of the impact of sound on the human body is incorrect.

In 2005, Jakobsen[2] concluded from available measurement data of wind turbines up to 4.2 MW that the infrasound pressure level from an upwind turbine at 100 m istance is about 70 db (G) or lower. In 2016, Keith et al.[3] reported that at a 10-m wind speed of 8 m/s, the measured maximum sound power level from nine different wind turbine types of 1.5 to 3 MW was 120 dB; from their results, it can be calculated that this corresponds to a total (0.5 to 16 Hz octaves) infrasound power level of 125 dB. Just taking spherical spreading into account to a point at a 100 m distance, this gives a sound pressure level of 73 dB or about 69 db (G). Herrmann et al.[4] measured infrasound pressure levels at 150 m from a wind turbine ranging from 55 to 80 db (G). At distances of 650 m and more, the wind turbine infrasound level was 55 to 75 db (G), irrespective of whether the wind turbines were operational or not: the specific wind turbine sound disappeared in the general environmental presence of infrasound.

Chaban et al. state that “the human body itself does not shield against infrasound”. In fact, sound does not easily penetrate the body: because both the density of and sound velocity in the human body tissues are rather higher than in the air, the acoustic impedance is much higher. As a consequence, sound predominantly reflects on the body and is not readily absorbed, similar to the high reflection of sound on the water. Thus the body already “protects” internal organs from outside noise, which has not been taken into account by the authors. For a possible amplification due to resonance, Chaban et al. give two references, one concerning maintenance personnel near military jet engines[5] and the other about subjects standing on a vibrating horizontal beam.[6] Both studies do not support their arguments. Smith showed that chest vibrations occurred at 60 to 100 Hz and stated as the main conclusion that “infrasound occurring at 40 Hz and below did not appear to be a problem.” The effect of standing on a horizontal beam vibrating in the vertical direction, as reported by Randall et al., is quite different from being exposed to more or less horizontally propagating airborne sound pressure waves because of differences in direction and magnitude of the forces exerted on the body. Chest vibration is unlikely to be a result of pressure exerted by a sound wave as the pressure difference over ≈30 cm (chest size) in an infrasound wave is very low (<1 Pa). Chest vibration is most likely driven by expansion and compression from the changing air pressure[7] (personal communication with Wijnant t. from the University of Twente) and is strongest when this coincides with the chest resonance frequency. Takahashi[8],[9] has shown that there is no sensation of vibration from infrasound/low-frequency sound when the level is below the hearing threshold. Although a chest vibration may be transmitted weakly to the heart, even at very high exposure levels near aircraft engines, heart problems have not been reported in studies by Smith[5] and Jensen et al.[9] Direct effects on the heart are thus far from plausible near wind turbines where the (infra)sound level is much lower and even below the perception threshold. There are a number of other reasons for reports of ill health[10] and these can be understood without speculative reference to the effects of infrasound at far higher and clearly perceptible levels.

  References Top

Chaban R, Ghazy A, Georgiade E, Stumpf N, Vahl CF. Negative effect of high-level infrasound on human myocardial contractility: In-vitro controlled experiment. Noise Health 2021; 23(109):57-66.  Back to cited text no. 1
Jakobsen J. Infrasound emission from wind turbines. J Low Freq Noise Vib 2005;24:145-55.  Back to cited text no. 2
Keith SE, Feder K, Voicescu SA et al. Wind turbine sound power measurements. J Acoust Soc Am 2016;139:1431-5.  Back to cited text no. 3
Herrmann L, Ratzel U, Bayer O et al. Low-frequency noise incl. infrasound from wind turbines and other sources. Report State Office for the Environment, Measurement and Nature Conservation of the Federal State of Baden-Wuerttemberg; 2016.  Back to cited text no. 4
Smith SD. Characterizing the effects of airborne vibration on human body vibration response. Aviat Space Environ Med 2002;73:36-45.  Back to cited text no. 5
Randall JM, Matthews RT, Stiles MA. Resonant frequencies of standing humans. Ergonomics 1997;40:879-86.  Back to cited text no. 6
Takahashi Y. Vibratory sensation induced by low-frequency noise: the threshold for ’vibration perceived in the head’ in normal-hearing subjects. J Low Freq Noise Vib 2013;32:1-10.  Back to cited text no. 7
Takahashi Y. Study on the relationship between unpleasantness and perception of vibration in the head of subjects exposed to low-frequency noise. Proceedings of the 46th International Congress Noise Control Engineering, Internoise 2017, Hong Kong, China, 27-30. August 2017, Petaluma, CA: International Institute of Noise Control Engineering.  Back to cited text no. 8
Jensen A, Lund S, Lucke T, Clausen O, Svendsen J. Non-auditory health effects among air force crew chiefs exposed to high level sound. Noise Health 2009;11:176-81.  Back to cited text no. 9
[PUBMED]  [Full text]  
van Kamp I, van den Berg F. Health effects related to wind turbine sound: an update. Int J Environ Res Public Health 2021;18:9133.  Back to cited text no. 10

Correspondence Address:
Frits van den Berg
Mundonovo Sound Research, Baflo
The Netherlands
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/nah.nah_19_22

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