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Disturbances in equilibrium function after major earthquake.

Honma M, Endo N, Osada Y, Kim Y, Kuriyama K - Sci Rep (2012)

Bottom Line: Major earthquakes were followed by a large number of aftershocks and significant outbreaks of dizziness occurred over a large area.Equilibrium dysfunction in the aftershock-exposed group appears to have arisen from disturbance of the inner ear, as well as individual vulnerability to state anxiety enhanced by repetitive exposure to aftershocks.We indicate potential effects of autonomic stress on equilibrium function after major earthquake.

View Article: PubMed Central - PubMed

Affiliation: Department of Adult Mental Health, National Institute of Mental Health, National Center of Neurology and Psychiatry, 4-1-1 Ogawa-Higashi, Kodaira, Tokyo 187-8553, Japan. mhonma@ncnp.go.jp

ABSTRACT
Major earthquakes were followed by a large number of aftershocks and significant outbreaks of dizziness occurred over a large area. However it is unclear why major earthquake causes dizziness. We conducted an intergroup trial on equilibrium dysfunction and psychological states associated with equilibrium dysfunction in individuals exposed to repetitive aftershocks versus those who were rarely exposed. Greater equilibrium dysfunction was observed in the aftershock-exposed group under conditions without visual compensation. Equilibrium dysfunction in the aftershock-exposed group appears to have arisen from disturbance of the inner ear, as well as individual vulnerability to state anxiety enhanced by repetitive exposure to aftershocks. We indicate potential effects of autonomic stress on equilibrium function after major earthquake. Our findings may contribute to risk management of psychological and physical health after major earthquakes with aftershocks, and allow development of a new empirical approach to disaster care after such events.

No MeSH data available.


Related in: MedlinePlus

Anxiety is associated with peripheral vestibular dysfunction.The power spectra for CoG fluctuations were divided into low- and high- frequency bands along the antero-posterior axis under the EC condition. (a) The percent CoG fluctuation in the low-frequency band in the Quake group was significantly greater than that in the Control group. (b) The percent CoG fluctuation in the high-frequency band in the Quake group was significantly lower than that in the Control group. (c) The percent CoG fluctuation in the low-frequency band was positively correlated with STAI-state. (d) The percent CoG fluctuation in the high-frequency band was negatively correlated with STAI-state. The power spectra for CoG fluctuations in both the low- and high-frequency bands for the Control group were not correlated with STAI-state. The red bars and red squares with solid regression lines represent the Quake group, and the blue bars and blue circles with dashed regression lines represent the Control group. Error bars indicate SEM.
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f4: Anxiety is associated with peripheral vestibular dysfunction.The power spectra for CoG fluctuations were divided into low- and high- frequency bands along the antero-posterior axis under the EC condition. (a) The percent CoG fluctuation in the low-frequency band in the Quake group was significantly greater than that in the Control group. (b) The percent CoG fluctuation in the high-frequency band in the Quake group was significantly lower than that in the Control group. (c) The percent CoG fluctuation in the low-frequency band was positively correlated with STAI-state. (d) The percent CoG fluctuation in the high-frequency band was negatively correlated with STAI-state. The power spectra for CoG fluctuations in both the low- and high-frequency bands for the Control group were not correlated with STAI-state. The red bars and red squares with solid regression lines represent the Quake group, and the blue bars and blue circles with dashed regression lines represent the Control group. Error bars indicate SEM.

Mentions: To determine the origin of the equilibrium dysfunction associated with repetitive exposure to aftershocks, we conducted a power spectrum analysis on the CoG using fast Fourier transform. The power was calculated for low-frequency bands (0.0–0.1 Hz) and high-frequency bands (1.0–10 Hz) as percentages of the total. We compared the power spectra of the groups using unpaired t tests and calculated correlation coefficients between the power spectra and the clinical assessment inventories. The low-frequency power of the CoG fluctuation in the antero-posterior direction in the Quake group was significantly greater than that in the Control group (t99 = 3.01, p = 0.003, Fig. 4a) under the EC condition. In contrast, the high-frequency power of the CoG fluctuation in the antero-posterior direction in the Quake group was significantly lower than that of the Control group (t99 = −2.429, p = 0.017; Fig. 4b). The low-frequency power of the CoG fluctuation was positively correlated with STAI-state (r = 0.315, p = 0.023; Fig. 4c), and the high-frequency power of the CoG fluctuation was negatively correlated with STAI-state (r = −0.401, p = 0.003; Fig. 4d) in the Quake group. However, neither frequency power was correlated with STAI-state, -trait, or BDI in the Control group (all: p > 0.10).


Disturbances in equilibrium function after major earthquake.

Honma M, Endo N, Osada Y, Kim Y, Kuriyama K - Sci Rep (2012)

Anxiety is associated with peripheral vestibular dysfunction.The power spectra for CoG fluctuations were divided into low- and high- frequency bands along the antero-posterior axis under the EC condition. (a) The percent CoG fluctuation in the low-frequency band in the Quake group was significantly greater than that in the Control group. (b) The percent CoG fluctuation in the high-frequency band in the Quake group was significantly lower than that in the Control group. (c) The percent CoG fluctuation in the low-frequency band was positively correlated with STAI-state. (d) The percent CoG fluctuation in the high-frequency band was negatively correlated with STAI-state. The power spectra for CoG fluctuations in both the low- and high-frequency bands for the Control group were not correlated with STAI-state. The red bars and red squares with solid regression lines represent the Quake group, and the blue bars and blue circles with dashed regression lines represent the Control group. Error bars indicate SEM.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3475992&req=5

f4: Anxiety is associated with peripheral vestibular dysfunction.The power spectra for CoG fluctuations were divided into low- and high- frequency bands along the antero-posterior axis under the EC condition. (a) The percent CoG fluctuation in the low-frequency band in the Quake group was significantly greater than that in the Control group. (b) The percent CoG fluctuation in the high-frequency band in the Quake group was significantly lower than that in the Control group. (c) The percent CoG fluctuation in the low-frequency band was positively correlated with STAI-state. (d) The percent CoG fluctuation in the high-frequency band was negatively correlated with STAI-state. The power spectra for CoG fluctuations in both the low- and high-frequency bands for the Control group were not correlated with STAI-state. The red bars and red squares with solid regression lines represent the Quake group, and the blue bars and blue circles with dashed regression lines represent the Control group. Error bars indicate SEM.
Mentions: To determine the origin of the equilibrium dysfunction associated with repetitive exposure to aftershocks, we conducted a power spectrum analysis on the CoG using fast Fourier transform. The power was calculated for low-frequency bands (0.0–0.1 Hz) and high-frequency bands (1.0–10 Hz) as percentages of the total. We compared the power spectra of the groups using unpaired t tests and calculated correlation coefficients between the power spectra and the clinical assessment inventories. The low-frequency power of the CoG fluctuation in the antero-posterior direction in the Quake group was significantly greater than that in the Control group (t99 = 3.01, p = 0.003, Fig. 4a) under the EC condition. In contrast, the high-frequency power of the CoG fluctuation in the antero-posterior direction in the Quake group was significantly lower than that of the Control group (t99 = −2.429, p = 0.017; Fig. 4b). The low-frequency power of the CoG fluctuation was positively correlated with STAI-state (r = 0.315, p = 0.023; Fig. 4c), and the high-frequency power of the CoG fluctuation was negatively correlated with STAI-state (r = −0.401, p = 0.003; Fig. 4d) in the Quake group. However, neither frequency power was correlated with STAI-state, -trait, or BDI in the Control group (all: p > 0.10).

Bottom Line: Major earthquakes were followed by a large number of aftershocks and significant outbreaks of dizziness occurred over a large area.Equilibrium dysfunction in the aftershock-exposed group appears to have arisen from disturbance of the inner ear, as well as individual vulnerability to state anxiety enhanced by repetitive exposure to aftershocks.We indicate potential effects of autonomic stress on equilibrium function after major earthquake.

View Article: PubMed Central - PubMed

Affiliation: Department of Adult Mental Health, National Institute of Mental Health, National Center of Neurology and Psychiatry, 4-1-1 Ogawa-Higashi, Kodaira, Tokyo 187-8553, Japan. mhonma@ncnp.go.jp

ABSTRACT
Major earthquakes were followed by a large number of aftershocks and significant outbreaks of dizziness occurred over a large area. However it is unclear why major earthquake causes dizziness. We conducted an intergroup trial on equilibrium dysfunction and psychological states associated with equilibrium dysfunction in individuals exposed to repetitive aftershocks versus those who were rarely exposed. Greater equilibrium dysfunction was observed in the aftershock-exposed group under conditions without visual compensation. Equilibrium dysfunction in the aftershock-exposed group appears to have arisen from disturbance of the inner ear, as well as individual vulnerability to state anxiety enhanced by repetitive exposure to aftershocks. We indicate potential effects of autonomic stress on equilibrium function after major earthquake. Our findings may contribute to risk management of psychological and physical health after major earthquakes with aftershocks, and allow development of a new empirical approach to disaster care after such events.

No MeSH data available.


Related in: MedlinePlus