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Vol. 64. Issue 2.
Pages 124-132 (March - April 2013)
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Vol. 64. Issue 2.
Pages 124-132 (March - April 2013)
Original Article
DOI: 10.1016/j.otoeng.2013.04.007
Spectrum Analysis in Postural Strategy on Static Tests in a Healthy Population
Estudio espectral de la estrategia postural de una población sana en pruebas estáticas
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Manuel Oliva Domíngueza,
Corresponding author
molivad@gmail.com

Corresponding author.
, Juan Bartual Magrob, Jorge Roquette Gaonac, Juan Bartual Pastord
a Servicio de Otorrinolaringología, Hospital Costa del Sol, Marbella, Málaga, Spain
b Servicio de Otorrinolaringología, Hospital Virgen de la Concha, Zamora, Spain
c Servicio de Otorrinolaringología, Hospital Universitario de Puerto Real, Puerto Real, Cádiz, Spain
d Catedrático de ORL, Jubilado, Cádiz, Spain
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Figures (4)
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Tables (2)
Table 1. Pitch Plane. Comparison of All the Groups Against Each Other.
Table 2. Roll Plane. Comparison of All the Groups Against Each Other.
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Abstract
Introduction and objectives

The power spectral density can be used to find a hidden behaviour in a physical system. We studied postural behaviour in a healthy population, by means of power spectral density, and compared it with a situation of complete immobility.

Methods

A group of healthy volunteers carried out the modified Clinical Test for Sensory Interaction in Balance. A fibre optic gyroscope device was used to record the data. We compared the power spectral density in these tests and with another recording where the device was motionless. We looked for significant differences using the ANOVA test.

Results

A power peak appeared at 8.4Hz in all static tests. The static group showed significant differences with all the other tests. We found no statistically significant differences when visual input discriminated between 2 tests. There were statistically significant differences for the proprioceptive input.

Conclusions

Brief movements are needed to maintain the quiet stance. The distinctive feature of these movements is a fundamental frequency at 1.4Hz and a harmonic frequency at 8.4Hz. Proprioceptive input is essential for balance.

Keywords:
Vertigo
Stance
Spectral analysis
Resumen
Introduccion y objetivos

La densidad espectral de potencia puede servir para encontrar comportamientos no evidentes en un sistema físico. Mediante la misma vamos a estudiar el comportamiento postural de una población sana, comparándolo con una situación de completa inmovilidad.

Metodos

Un grupo de voluntarios sanos realizaron las pruebas correspondientes al modified Clinical Test for Sensory Interaction in Balance. El registro se hizo mediante un giroscopio de fibra óptica. Comparamos la densidad espectral de potencia de estas pruebas con otros registros donde el dispositivo está completamente inmóvil. Buscamos diferencias significativas mediante el test ANOVA.

Resultados

En las pruebas estáticas aparece un pico de potencia en 8.4Hz. El grupo Estático presenta diferencias significativas con todas las pruebas y no aparecen cuando el factor diferenciador es la existencia o no de información visual. Sí las hay cuando la diferencia es la información somatosensorial.

Conclusiones

Se necesitan pequeños movimientos para mantener la bipedestación. Estos movimientos se caracterizan por una frecuencia fundamental de 1.4Hz y un armónico a 8.4Hz. Las aferencias somatosensoriales son fundamentales para el mantenimiento del equilibrio.

Palabras clave:
Vértigo
Postura
Análisis espectral

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