The interaction of whole body vibration and noise on the cochlea

Soliman, Soliman M.; El-Atreby, M; Tawfik, Somia; Holail, E; Iskandar, Nagy M; Abousetta, Alaa

doi:10.1016/s0531-5131(03)00890-2

Cited by 4 publications

(18 citation statements)

References 8 publications

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“…Similar finding appeared in guinea pigs at LS dp following a 4-week vibration exposure that could be attributed to the normal OHC s , severely vacuolated IHC s , and edematous and vacuolated supporting cells [12]. …”

Section: Discussionsupporting

confidence: 68%

“…There are, therefore, two important findings in this study: 1) WBV resulted in DPOAE level (L dp ) increases, and; 2) the greatest change in DPOAE level (L dp ) occurred at 5888.5 Hz. Consistently, Soliman et al (2003) showed that 4-weeks-exposure to vibration only in guinea pigs led to enhancement of DPOAE amplitudes [12]. Martin et al (1977) reported that NZW rabbits’ auditory sensitivity is maximal in the mid-to-high frequency range and rapidly decreased in the lower and higher frequencies due to the conditional nictitating membrane (NM) response [21].…”

Section: Discussionmentioning

confidence: 99%

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RETRACTED ARTICLE: Assessment of the influence of whole body vibration on Cochlear function

Moussavi-Najarkola

Khavanin

Mirzaei

et al. 2012

J Occup Med Toxicol

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BackgroundWhole body vibration (WBV) is a potentially harmful consequence resulting from the dissipation of energy by industrial machineries. The result of WBV exposure on the auditory system remains unknown. The objective of the present research was to evaluate the influence of WBV on cochlear function, in particular outer hair cell function. It is hypothesized that WBV impairs cochlear function resulting in decreased Distortion Product Otoacoustic Emission (DPOAE) levels (Ldp) in rabbits subjected to WBV.MethodsTwelve rabbits were equally divided into vibration and control groups. Animals in vibration group were exposed to 1.0 ms-2 r.m.s vertical WBV at 4–8 Hz for 8 h/day during 5 consecutive days. Outer hair cell function was assessed by comparing repeated-measurements of DPOAE levels (Ldp) across a range of f2 frequencies in rabbits both exposed and unexposed to WBV. DPOAE level shifts (LSdp) were compared across ears, frequencies, groups, and times.ResultsNo differences were seen over time in DPOAE levels in the non-exposed rabbits (p = 0.082). Post-exposure Ldp in rabbits exposed to WBV were significantly increased at all test frequencies in both ears compared to baseline measures (p = 0.021). The greatest increase in Ldp following exposure was seen at 5888.5 Hz (mean shift = 13.25 dB). Post-exposure Ldp in rabbits exposed to WBV were not significantly different between the right and left ears (p = 0.083).ConclusionWBV impairs cochlear function resulting in increased DPOAE responses in rabbits exposed to WBV. DPOAE level shifts occurred over a wide range of frequencies following prolonged WBV in rabbits.

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Section: Discussionsupporting

confidence: 68%

Section: Discussionmentioning

confidence: 99%

RETRACTED ARTICLE: Assessment of the influence of whole body vibration on Cochlear function

Moussavi-Najarkola

Khavanin

Mirzaei

et al. 2012

J Occup Med Toxicol

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“…Bochnia et al (2005) asserted that vibration-induced damages done to the inner ear structures may cause a worsening of hearing there, especially in the low and medium frequencies ( 7 ). Furthermore, Soliman et al (2003) reported that the exposure to vibration only led to enhancement of both DPOAEs amplitudes and signal to noise ratios (SNR) ( 13 ). As well, Moussavi-Najarkola et al (2012) showed that 1.0 m.s -2 r.m.s whole-body vibration (WBV) in Z-axis at 4-8 Hz frequency for 8 hours per day during 5 consecutive days has been associated with enhanced larger DPOAE amplitudes (A dp ) at mid to high frequencies compared to control rabbits ( 11 ).…”

Section: Resultsmentioning

confidence: 99%

“…Bochnia et al (2005) professed low and medium frequency-vibration damages to the inner ear structures ( 7 ). Soliman et al (2003) asserted that WBV exposure enhanced DPOAEs amplitudes and signal to noise ratios (SNR) ( 13 ). Moussavi-Najarkola et al (2012) showed larger DPOAE amplitudes (Adp) at mid to high frequencies in vertical WBV-exposed rabbits ( 11 ).…”

Section: Introductionmentioning

confidence: 99%

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Cochlear Damages Caused by Vibration Exposure

Najarkola¹,

Khavanin²,

Mirzaei³

et al. 2013

Iran Red Crescent Med J

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Background: Many industrial devices have an excessive vibration which can affect human body systems. The effect of vibration on cochlear histology has been as a debatable problem in occupational health and medicine. Objectives: Due to limitation present in human studies, the research was conducted to survey the influence of vibration on cochlear histology in an animal model. Materials and Methods: Twelve albino rabbits were experimented as: Vibration group (n = 6; exposed to 1.0 m.s -2 r.m.s vertical wholebody vibration at 4 -8 Hz for 8 hours per day during 5 consecutive days) versus Control group (n = 6; the same rabbits without vibration exposure). After finishing the exposure scenario, all rabbits were killed by CO2 inhalation; their cochleae were extracted and fixed in 10% formaldehyde for 48 hours, decalcified by 10% nitric acid for 24 hours. Specimens were dehydrated, embedded, sectioned 5 µm thick and stained with Hematoxylin and Eosin for light microscopy observations. Results: Severely hydropic degenerated and vacuolated inner hair cells (IHCs) were observed in vibration group compared to the control group. Inter and intracellular edema was appeared in supporting cells (SC). Nuclei of outer hair cells (OHCs) seemed to be pyknotic. Slightly thickened basilar membrane (BM) was probably implied to inter cellular edematous. Tectorial Membrane (TM) was not affected pathologically. Conclusions: Whole-body vibration could cause cochlear damages in male rabbits, though vibration-induced auditory functional effects might be resulted as subsequent outcome of prolonged high level vibration exposures.

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Effects of whole body vibration on outer hair cells’ hearing response to distortion product otoacoustic emissions

Moussavi-Najarkola

Khavanin

Mirzaei

et al. 2012

In Vitro Cell.Dev.Biol.-Animal

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Whole body vibration (WBV) is one of the most vexing problems in industries. There is a debate about the effect of WBV exposure on hearing system as vibration-induced hearing loss. The purpose of this study was to investigate outer hair cells' (OHCs') hearing response hearing response to distortion product otoacoustic emissions (DPOAEs) in rabbits exposed to WBV. It was hypothesized that the DPOAE response amplitudes (A(dp)) in rabbits exposed to WBV would be lower than those in control rabbits not exposed to WBV. New Zealand white (NZW) rabbits as vibration group (n = 6, exposed to WBV in the z-axis at 4-8 Hz and 1.0 ms(-2) root mean square for 8 h per day during five consecutive days) and NZW rabbits as control group (n = 6, not exposed to any WBV) were participated. A(dp) and noise floor levels (L(nf)) were examined on three occasions: day 0 (i.e., baseline), day 8 (i.e., immediately 1 h after exposure), and day 11 (i.e., 72 h following exposure) with f(2) frequencies ranging from 500 to 10,000 Hz and primaries L(1) and L(2) levels of 65 and 55 dB sound pressure level, respectively. Main effects were statistically found to be significant for group, time, and frequency (p < 0.05). DPOAE amplitudes were significantly larger for rabbits exposed to WBV, larger on day 8 and larger for mid to high f(2) frequencies (at and above 5,888.50 Hz). Main effects were not statistically found to be significant for ear (p > 0.05). Also, four statistically significant interactions including time by ear, time by frequency, group by frequency, and group by time were detected (p < 0.05). Contrary to the main hypothesis, DPOAE amplitudes were significantly larger for rabbits exposed to WBV. WBV exposure significantly led to enhanced mean A(dp) at mid to high frequencies rather than at low ones.

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The interaction of whole body vibration and noise on the cochlea

Cited by 4 publications

References 8 publications

RETRACTED ARTICLE: Assessment of the influence of whole body vibration on Cochlear function

RETRACTED ARTICLE: Assessment of the influence of whole body vibration on Cochlear function

Cochlear Damages Caused by Vibration Exposure

Effects of whole body vibration on outer hair cells’ hearing response to distortion product otoacoustic emissions

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