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The tonicity of a solution determines if a cell gains or loses water in that solution. The tonicity depends on the permeability of the cell membrane for different solutes and the concentration of nonpenetrating solutes in the solution within and outside of the cell. If a semipermeable membrane hinders the passage of some solutes but allows water to follow its concentration gradient, water moves from the side with low osmolarity (i.e., less solute) to the side with higher osmolarity (i.e.,...
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Los caballos humedecen la primavera en su paso.

A M Wilson1, M P McGuigan, A Su

  • 1Department of Veterinary Basic Sciences, The Royal Veterinary College, Hatfield, Herts AL9 7TA, UK. awilson@rvc.ac.uk

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Los tendones de las patas del caballo actúan como palos pogo, almacenando energía para galopar. Sorprendentemente, los músculos flexores digitales no impulsan el movimiento principal, sino que amortiguan las vibraciones de alta frecuencia, protegiendo los huesos y los tendones.

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Área de la Ciencia:

  • La biomecánica es la biomecánica.
  • La locomoción equina es la locomoción de los caballos.
  • Adaptaciones musculoesqueléticas Adaptaciones musculoesqueléticas

Sus antecedentes:

  • Los caballos utilizan la energía de deformación elástica en las unidades músculo-tendón para reducir el trabajo muscular durante el galope.
  • Las piernas funcionan de manera similar a un palo pogo, sintonizado con una frecuencia de zancada específica (2,5 Hz).
  • Las adaptaciones únicas en los músculos flexores digitales (fibras cortas, propiedades pasivas) y los tendones largos facilitan este almacenamiento de energía.

Objetivo del estudio:

  • Investigar el papel de los músculos flexores digitales en la locomoción equina.
  • Determinar la función de las adaptaciones musculoesqueléticas en el manejo de las vibraciones de las extremidades.
  • Aclarar la contribución de las fibras musculares frente a los tendones en el mecanismo de galope.

Principales métodos:

  • Análisis de la disposición mecánica de la pierna equina.
  • Examen de las frecuencias vibratorias dentro de la extremidad durante la locomoción.
  • Evaluación de las capacidades funcionales de los músculos flexores digitales en la regulación de los ciclos de movimiento.

Principales resultados:

  • La estructura elástica de la pierna permite vibraciones de alta frecuencia (30-40 Hz), lo que plantea un riesgo de daño por fatiga.
  • Los músculos flexores digitales exhiben una capacidad limitada para influir en el ciclo primario de galope de 2.5 Hz.
  • Estos músculos están posicionados de manera óptima para amortiguar las oscilaciones de alta frecuencia.

Conclusiones:

  • Los músculos flexores digitales equinos juegan un papel crucial en la amortiguación de las vibraciones, no en la locomoción primaria.
  • Este mecanismo de amortiguación protege contra posibles daños por fatiga en los tendones y los huesos.
  • La interacción entre el almacenamiento de energía elástica y la amortiguación activa optimiza la función de las extremidades equinas durante el movimiento de alta velocidad.