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Phosphatidylserine, Taurine, and Caffeine for Cognitive Fatigue in Professional Football Players (TCPS-Foot)

9 de septiembre de 2026 actualizado por: Krzysztof Mizera, Vizja University in Warsaw

Neurocognitive Fatigue Resistance, Visual Search Efficiency, and Tactical Decision-Making After Phosphatidylserine-Containing Taurine-Caffeine Supplementation in Professional Male Football Players

This randomized, double-blind, placebo-controlled, parallel-group trial evaluated neurocognitive fatigue resistance and football-specific decision-making following 28 days of taurine-caffeine supplementation with or without phosphatidylserine in professional male football players. Sixty-five male outfield football players from two professional clubs were randomized to placebo, taurine plus caffeine, or taurine plus caffeine plus phosphatidylserine. Neurocognitive fatigue resistance was evaluated during a standardized high-load Stroop/Flanker task, while football-specific tactical decision-making, visual-search behavior, and field-based reactive decision performance were assessed at baseline and after 28 days of supplementation.

Descripción general del estudio

Estado

Terminado

Condiciones

Intervención / Tratamiento

Descripción detallada

This study was designed to determine whether adding phosphatidylserine to taurine-caffeine supplementation improves neurocognitive fatigue resistance and football-specific decision-making in professional male football players. Participants completed familiarization procedures, baseline laboratory and field testing, 28 days of supplementation, and post-intervention laboratory and field testing. Neurocognitive fatigue resistance was assessed using a standardized high-load Stroop/Flanker protocol. Football-specific decision-making was evaluated using video-based tactical decision tasks incorporating offensive and transitional match situations and requiring rapid selection of the most appropriate tactical response. Visual-search behavior was assessed using screen-based eye tracking during the football-specific decision task. Field-based reactive decision performance was evaluated using a standardized Reactive Passing Decision Test requiring perception of an external visual stimulus followed by selection and execution of the appropriate passing response. Outcome assessments were conducted before and after the 28-day supplementation period under standardized testing conditions.

Tipo de estudio

Intervencionista

Inscripción (Actual)

65

Fase

  • No aplica

Contactos y Ubicaciones

Esta sección proporciona los datos de contacto de quienes realizan el estudio e información sobre dónde se lleva a cabo este estudio.

Ubicaciones de estudio

  • Polonia
      • Lodz, Polonia
        • Professional Football Training Center
      • Warsaw, Polonia
        • Professional Football Training Center

Criterios de participación

Los investigadores buscan personas que se ajusten a una determinada descripción, denominada criterio de elegibilidad. Algunos ejemplos de estos criterios son el estado de salud general de una persona o tratamientos previos.

Criterio de elegibilidad

Edades elegibles para estudiar

  • Adulto

Acepta Voluntarios Saludables

Sí

Descripción

Inclusion Criteria:

  • Male professional outfield football players aged 18 to 37 years.
  • First-team players or selected U19 players aged 18 years or older who are regularly integrated into first-team training.
  • Regular participation in club training.
  • At least 5 years of systematic football training experience.
  • Free from injury or illness limiting full participation in training and testing.
  • Normal or corrected-to-normal vision.
  • Ability to complete the laboratory and field-based testing procedures.
  • Written informed consent provided before participation.

Exclusion Criteria:

  • Goalkeepers.
  • Current injury or illness limiting full participation in testing.
  • Neurological disease.
  • Recent concussion or head trauma.
  • Uncorrected visual impairment.
  • Use of phosphatidylserine, nootropic agents, or strong stimulants during the previous 4 weeks.
  • Non-standard caffeine intake on testing days.
  • Failure to comply with pre-test standardization procedures.
  • Failed eye-tracker calibration.
  • Loss of more than 30% of gaze data during the football-specific decision-making task.
  • Withdrawal of consent.

Plan de estudios

Esta sección proporciona detalles del plan de estudio, incluido cómo está diseñado el estudio y qué mide el estudio.

¿Cómo está diseñado el estudio?

Detalles de diseño

  • Propósito principal: Otro
  • Asignación: Aleatorizado
  • Modelo Intervencionista: Asignación paralela
  • Enmascaramiento: Cuadruplicar

Armas e Intervenciones

Grupo de participantes/brazo
Intervención / Tratamiento
Comparador de placebos: Placebo
Participants randomized to this arm will receive an inert placebo for 28 days. The placebo will be provided in identical coded packs matched for appearance, number of units, and packaging with the active supplements.
Suplemento dietético: Placebo
Inert placebo matched with the active supplements for appearance, number of units, and packaging. The placebo will be administered for 28 days.
Comparador activo: Taurine Plus Caffeine
Participants randomized to this arm will receive taurine 1500 mg/day plus caffeine 200 mg/day for 28 days. On training and testing days, the supplement will be consumed approximately 60 minutes before the main training session or testing procedure. On non-training days, it will be consumed at a consistent morning time.
Suplemento dietético: Taurine Plus Caffeine
Taurine 1500 mg/day plus caffeine 200 mg/day administered for 28 days. On training and testing days, the supplement will be consumed approximately 60 minutes before the main training session or testing procedure. On non-training days, it will be consumed at a consistent morning time.
Experimental: Taurine, Caffeine, and Phosphatidylserine
Participants randomized to this arm will receive taurine 1500 mg/day plus caffeine 200 mg/day plus phosphatidylserine 600 mg/day for 28 days. On training and testing days, the supplement will be consumed approximately 60 minutes before the main training session or testing procedure. On non-training days, it will be consumed at a consistent morning time.
Suplemento dietético: Taurine, Caffeine, and Phosphatidylserine
Taurine 1500 mg/day plus caffeine 200 mg/day plus phosphatidylserine 600 mg/day administered for 28 days. On training and testing days, the supplement will be consumed approximately 60 minutes before the main training session or testing procedure. On non-training days, it will be consumed at a consistent morning time.

¿Qué mide el estudio?

Medidas de resultado primarias

Medida de resultado
Medida Descripción
Periodo de tiempo
Tactical Inhibitory Decision Accuracy Under Neurocognitive Load
Periodo de tiempo: Baseline and 28 days of supplementation
Tactical inhibitory decision accuracy will be assessed using football-specific video clips requiring inhibition of an immediately attractive but suboptimal tactical action. Responses will be scored as 1 point for an optimal decision, 0.5 points for an acceptable decision, and 0 points for an incorrect decision. The outcome will be calculated as the mean score across inhibitory tactical clips. The score ranges from 0 to 1, with higher values indicating better tactical inhibitory decision accuracy.
Baseline and 28 days of supplementation

Medidas de resultado secundarias

Medida de resultado
Medida Descripción
Periodo de tiempo
Overall Football-Specific Optimal Decision Rate
Periodo de tiempo: Baseline and 28 days of supplementation
Overall football-specific decision accuracy will be assessed using video-based offensive and transitional football situations. Players will select the most appropriate tactical option under time pressure. The outcome will be expressed as the percentage of correct or expert-rated optimal decisions, with higher values indicating better decision-making accuracy.
Baseline and 28 days of supplementation
Football-Specific Decision Time
Periodo de tiempo: Baseline and 28 days of supplementation
Decision time will be assessed during the football-specific video decision-making task. It will be measured as the time taken to select a tactical response after the critical decision point. The outcome will be expressed in milliseconds, with lower values indicating faster decision-making.
Baseline and 28 days of supplementation
Impulsive Tactical Error Rate
Periodo de tiempo: Baseline and 28 days of supplementation
Impulsive tactical errors will be assessed during football-specific video clips. These errors will include selections of immediately attractive but suboptimal tactical options, such as inappropriate forward actions, low-quality shots, or forced progressive decisions when a safer or more appropriate option is available.
Baseline and 28 days of supplementation
Stroop/Flanker Time-on-Task Reaction-Time Trajectory
Periodo de tiempo: Baseline and 28 days of supplementation
Correct-trial reaction time will be assessed across six consecutive 5-minute epochs of the 30-minute high-load Stroop/Flanker task. Time-on-task performance decrement will be quantified from the within-session trajectory of reaction time across successive epochs, with a greater increase in reaction time indicating greater neurocognitive performance deterioration and a smaller increase indicating greater neurocognitive fatigue resistance. Response accuracy across epochs will be reported as a complementary measure.
Baseline and 28 days of supplementation
Stroop/Flanker Reaction-Time Variability
Periodo de tiempo: Baseline and 28 days of supplementation
Reaction-time variability will be assessed during the 30-minute high-load Stroop/Flanker task. It will be quantified from valid correct-trial reaction times as a within-participant measure of response-time variability and expressed in milliseconds, with greater variability indicating lower response stability.
Baseline and 28 days of supplementation
Post-Task Mental Fatigue
Periodo de tiempo: Baseline and 28 days of supplementation
Perceived mental fatigue will be assessed immediately before and immediately after the 30-minute neurocognitive-load task using a 0-10 numerical rating scale, with higher scores indicating greater perceived mental fatigue. The registered outcome will be the post-task mental-fatigue score assessed at baseline and after 28 days of supplementation. The acute pre-to-post task change will additionally be used as a manipulation check of the neurocognitive-load protocol.
Baseline and 28 days of supplementation
Time to First Fixation on the Optimal Tactical Area of Interest
Periodo de tiempo: Baseline and 28 days of supplementation
Time to first fixation on the optimal tactical option will be assessed using screen-based eye-tracking during the football-specific video decision-making task. The outcome will be expressed in milliseconds and will reflect how quickly the player visually orients toward the expert-defined optimal option.
Baseline and 28 days of supplementation
Dwell Time on the Optimal Tactical Area of Interest
Periodo de tiempo: Baseline and 28 days of supplementation
Dwell time on the optimal tactical option will be assessed using screen-based eye-tracking during the football-specific video decision-making task. The outcome will be expressed as the percentage of total viewing time spent fixating on the expert-defined optimal tactical option.
Baseline and 28 days of supplementation
Situational-Awareness Accuracy
Periodo de tiempo: Baseline and 28 days of supplementation
Situational awareness accuracy will be assessed using probes presented after selected football-specific video clips. These probes will evaluate whether players correctly identified key tactical information, including available space, pressure location, number of defenders, teammate positioning, and defensive-line configuration.
Baseline and 28 days of supplementation
Reactive Passing Decision-Selection Accuracy
Periodo de tiempo: Baseline and 28 days of supplementation
Reactive Passing Decision Test accuracy will be assessed during a field-based football-specific task. Players will dribble into a decision zone and respond to a late visual or situational cue by selecting and executing the optimal passing option. The outcome will be expressed as the percentage of accurate decisions.
Baseline and 28 days of supplementation

Colaboradores e Investigadores

Aquí es donde encontrará personas y organizaciones involucradas en este estudio.

Patrocinador

Vizja University in Warsaw

Colaboradores

Józef Piłsudski University of Physical Education

Fechas de registro del estudio

Estas fechas rastrean el progreso del registro del estudio y los envíos de resultados resumidos a ClinicalTrials.gov. Los registros del estudio y los resultados informados son revisados ​​por la Biblioteca Nacional de Medicina (NLM) para asegurarse de que cumplan con los estándares de control de calidad específicos antes de publicarlos en el sitio web público.

Fechas importantes del estudio

Inicio del estudio (Actual)

6 de agosto de 2026

Finalización primaria (Actual)

8 de septiembre de 2026

Finalización del estudio (Actual)

8 de septiembre de 2026

Fechas de registro del estudio

Enviado por primera vez

5 de julio de 2026

Primero enviado que cumplió con los criterios de control de calidad

5 de julio de 2026

Publicado por primera vez (Actual)

10 de julio de 2026

Actualizaciones de registros de estudio

Última actualización publicada (Actual)

14 de septiembre de 2026

Última actualización enviada que cumplió con los criterios de control de calidad

9 de septiembre de 2026

Última verificación

1 de septiembre de 2026

Más información

Términos relacionados con este estudio

Palabras clave

Términos MeSH relevantes adicionales

Otros números de identificación del estudio

  • MIZERA -4-TCPS-FOOT-2026

Plan de datos de participantes individuales (IPD)

¿Planea compartir datos de participantes individuales (IPD)?

NO

Descripción del plan IPD

No individual participant data will be shared because the study includes a small sample of professional football players from a limited number of clubs, which may increase the risk of indirect participant identification. Only aggregated and anonymized study results will be reported.

Información sobre medicamentos y dispositivos, documentos del estudio

Estudia un producto farmacéutico regulado por la FDA de EE. UU.

No

Estudia un producto de dispositivo regulado por la FDA de EE. UU.

No

Esta información se obtuvo directamente del sitio web clinicaltrials.gov sin cambios. Si tiene alguna solicitud para cambiar, eliminar o actualizar los detalles de su estudio, comuníquese con register@clinicaltrials.gov. Tan pronto como se implemente un cambio en clinicaltrials.gov, también se actualizará automáticamente en nuestro sitio web. .

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