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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

Differences between higher- and lower-stress members of the Quake group in the relationships between psychological stress and equilibrium dysfunction under the EC condition.STAI-state was significantly correlated with TPL (a), REC-Area (b), and ENV-Area (c) in higher scoring individuals; however, it was not correlated with TPL (a), REC-Area (b), or ENV-Area (c) in lower scoring individuals. STAI-trait was significantly correlated with TPL (d), but was not correlated with REC-Area (e) or ENV-Area (f) in higher scoring individuals. In the lower scoring subgroup, STAI-trait was not correlated with any stabilometric measurement (d, TPL; e, REC-Area; f, ENV-Area). The BDI was not correlated with any stabilometric measurement for either higher scoring individuals (g, TPL; h, REC-Area; i, ENV-Area) or lower scoring individuals (g, TPL; h, REC-Area; i, ENV-Area). The purple diamonds with dashed regression lines represent the lower group, and the pink triangles with solid regression lines represent the higher group.
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f3: Differences between higher- and lower-stress members of the Quake group in the relationships between psychological stress and equilibrium dysfunction under the EC condition.STAI-state was significantly correlated with TPL (a), REC-Area (b), and ENV-Area (c) in higher scoring individuals; however, it was not correlated with TPL (a), REC-Area (b), or ENV-Area (c) in lower scoring individuals. STAI-trait was significantly correlated with TPL (d), but was not correlated with REC-Area (e) or ENV-Area (f) in higher scoring individuals. In the lower scoring subgroup, STAI-trait was not correlated with any stabilometric measurement (d, TPL; e, REC-Area; f, ENV-Area). The BDI was not correlated with any stabilometric measurement for either higher scoring individuals (g, TPL; h, REC-Area; i, ENV-Area) or lower scoring individuals (g, TPL; h, REC-Area; i, ENV-Area). The purple diamonds with dashed regression lines represent the lower group, and the pink triangles with solid regression lines represent the higher group.

Mentions: To verify the additional hypothesis that psychological stress may affect equilibrium function differently according to the intensity of the stress, we conducted the above statistical analyses for both higher- and the lower-stress Quake subgroups, as determined by the median values of each clinical assessment inventory. The STAI-state (median value = 46) was correlated with the TPL (r = 0.495, p = 0.007; Fig. 3a), REC-Area (r = 0.431, p = 0.022; Fig. 3b), and ENV-Area (r = 0.514, p = 0.005; Fig. 3c) in the higher STAI-state group (n = 28), although it was not correlated with any of the stabilometric measurements (all: p > 0.10; Fig. 3a–c) in the lower STAI-state group (n = 24). The STAI-trait (median value = 50) was correlated with the TPL (r = 0.436, p = 0.021; Fig. 3d), but was not correlated with REC-Area (p > 0.10; Fig. 3e) or ENV-Area (P > 0.05; Fig. 3f) in the higher STAI-trait group (n = 28). It also was not correlated with any of the stabilometric measurements (all: p > 0.05; Fig. 3d–f) in the lower STAI-trait group (n = 24). The BDI (median value = 26) was not correlated with any of the stabilometric measurements in either the higher (n = 27, all: p > 0.05; Fig. 3g–i) or lower (n = 25, all: p > 0.10; Fig. 3g–i) BDI groups. These results indicate that individuals with greater anxiety symptoms in the Quake group showed a marked relationship between the severity of anxiety and equilibrium dysfunction. Greater anxiety, as reflected by STAI-state scores, was associated with worse equilibrium function in the Quake group.


Disturbances in equilibrium function after major earthquake.

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

Differences between higher- and lower-stress members of the Quake group in the relationships between psychological stress and equilibrium dysfunction under the EC condition.STAI-state was significantly correlated with TPL (a), REC-Area (b), and ENV-Area (c) in higher scoring individuals; however, it was not correlated with TPL (a), REC-Area (b), or ENV-Area (c) in lower scoring individuals. STAI-trait was significantly correlated with TPL (d), but was not correlated with REC-Area (e) or ENV-Area (f) in higher scoring individuals. In the lower scoring subgroup, STAI-trait was not correlated with any stabilometric measurement (d, TPL; e, REC-Area; f, ENV-Area). The BDI was not correlated with any stabilometric measurement for either higher scoring individuals (g, TPL; h, REC-Area; i, ENV-Area) or lower scoring individuals (g, TPL; h, REC-Area; i, ENV-Area). The purple diamonds with dashed regression lines represent the lower group, and the pink triangles with solid regression lines represent the higher group.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f3: Differences between higher- and lower-stress members of the Quake group in the relationships between psychological stress and equilibrium dysfunction under the EC condition.STAI-state was significantly correlated with TPL (a), REC-Area (b), and ENV-Area (c) in higher scoring individuals; however, it was not correlated with TPL (a), REC-Area (b), or ENV-Area (c) in lower scoring individuals. STAI-trait was significantly correlated with TPL (d), but was not correlated with REC-Area (e) or ENV-Area (f) in higher scoring individuals. In the lower scoring subgroup, STAI-trait was not correlated with any stabilometric measurement (d, TPL; e, REC-Area; f, ENV-Area). The BDI was not correlated with any stabilometric measurement for either higher scoring individuals (g, TPL; h, REC-Area; i, ENV-Area) or lower scoring individuals (g, TPL; h, REC-Area; i, ENV-Area). The purple diamonds with dashed regression lines represent the lower group, and the pink triangles with solid regression lines represent the higher group.
Mentions: To verify the additional hypothesis that psychological stress may affect equilibrium function differently according to the intensity of the stress, we conducted the above statistical analyses for both higher- and the lower-stress Quake subgroups, as determined by the median values of each clinical assessment inventory. The STAI-state (median value = 46) was correlated with the TPL (r = 0.495, p = 0.007; Fig. 3a), REC-Area (r = 0.431, p = 0.022; Fig. 3b), and ENV-Area (r = 0.514, p = 0.005; Fig. 3c) in the higher STAI-state group (n = 28), although it was not correlated with any of the stabilometric measurements (all: p > 0.10; Fig. 3a–c) in the lower STAI-state group (n = 24). The STAI-trait (median value = 50) was correlated with the TPL (r = 0.436, p = 0.021; Fig. 3d), but was not correlated with REC-Area (p > 0.10; Fig. 3e) or ENV-Area (P > 0.05; Fig. 3f) in the higher STAI-trait group (n = 28). It also was not correlated with any of the stabilometric measurements (all: p > 0.05; Fig. 3d–f) in the lower STAI-trait group (n = 24). The BDI (median value = 26) was not correlated with any of the stabilometric measurements in either the higher (n = 27, all: p > 0.05; Fig. 3g–i) or lower (n = 25, all: p > 0.10; Fig. 3g–i) BDI groups. These results indicate that individuals with greater anxiety symptoms in the Quake group showed a marked relationship between the severity of anxiety and equilibrium dysfunction. Greater anxiety, as reflected by STAI-state scores, was associated with worse equilibrium function in the Quake group.

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