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Las fluctuaciones paso a paso y los patrones temporales de actividad muscular muestran una relación más fuerte en la
Christos Chalitsios1, Vasileios Mylonas2, Nick Stergiou1,2
1AUTH Biomechanics Laboratory, School of Physical Education and Sports Science, Aristotle, University of Thessaloniki, Thessaloniki, Greece.
Scandinavian journal of medicine & science in sports
|February 9, 2026
Resumen
La fatiga por correr de alta intensidad fortalece la conexión entre el tiempo de la zancada y la activación muscular. Esto sugiere que el sistema locomotor se vuelve menos flexible y más acoplado cuando está fatigado.
Área de la Ciencia:
- La biomecánica es la biomecánica.
- Fisiología Humana Fisiología Humana.
- El control del motor es el control del motor.
Sus antecedentes:
- Las fluctuaciones paso a paso y los patrones de activación muscular comparten similitudes temporales durante la marcha normal.
- Comprender cómo la fatiga afecta esta relación es crucial para optimizar el rendimiento en la carrera y la prevención de lesiones.
Objetivo del estudio:
- Investigar el efecto de la fatiga inducida por la carrera de alta intensidad en el acoplamiento entre la variabilidad del tiempo de zancada y los patrones de activación muscular.
- Para determinar si la fatiga altera la complejidad y la coordinación del sistema locomotor.
Principales métodos:
- Once corredores experimentados realizaron dos carreras de 400 m con una pausa que indujo fatiga.
- Los intervalos de tiempo de zancada (STI) medidos a través de IMU y los intervalos de pico intermuscular (IMPI) de EMG de Vastus Lateralis y Gastrocnemius Medialis.
- Exponente de Hurst analizado y coeficiente de variación (CV) para series temporales, correlacionando métricas de ITS e IMPI; fatiga evaluada a través de la saturación de oxígeno muscular (SmO2) y frecuencia de EMG.
Principales resultados:
- La fatiga reduce significativamente la saturación de oxígeno muscular y altera las características del EMG, lo que indica una reducción de la flexibilidad neuromuscular.
- Valores más altos del exponente de Hurst observados en todas las series temporales después de la fatiga, lo que sugiere una mayor persistencia de la señal.
- Las correlaciones entre el intervalo de tiempo de zancada y el intervalo de pico intermuscular aumentaron significativamente en el estado de fatiga, lo que indica un acoplamiento fortalecido.
Conclusiones:
- La fatiga de alta intensidad mejora el acoplamiento entre las fluctuaciones paso a paso y los patrones de activación muscular.
- El sistema locomotor fatigado se reorganiza en un estado más estrechamente acoplado y menos flexible.
- Los hallazgos sugieren que los cambios inducidos por la fatiga en el control neuromuscular subyacen al fortalecimiento observado del acoplamiento entre la variabilidad de la marcha y la activación muscular.
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