Mental Fatigue, Attentional Focus, and Countermovement Jump Performance
19 августа 2026 г. обновлено: Oğuzhan Bozkurt, Inonu University
The Effects of Acute Mental Fatigue and Attentional Focus Instructions on Countermovement Jump Performance
This study examines whether short-term mental fatigue and different jump instructions affect how high people can jump.
Thirty-two physically active university students will complete two testing sessions in random order: one after a 30-minute mentally tiring computer task and one after a 30-minute relaxing video.
In both sessions, participants will perform vertical jumps while receiving one of three types of instructions: no special instruction, focusing on their own body movements, or focusing on pushing the ground away.
The study will compare jump height across these conditions to better understand how mental tiredness and coaching cues affect jumping performance, which may help coaches and athletes design better training and competition preparation.
Обзор исследования
Статус
Еще не набирают
Подробное описание
This study uses a sex-stratified, randomized, counterbalanced crossover design with repeated measures to examine the effects of acute mental fatigue and attentional-focus instructions on countermovement jump (CMJ) performance. Thirty-two physically active undergraduate students (16 women, 16 men), aged 18-30 years, will be enrolled from the Faculty of Sport Sciences at İnönü University, Malatya, Türkiye.
Each participant will complete two experimental protocols, separated by at least 72 hours: a control protocol (approximately 30 minutes of passive viewing of a narration-free nature video) and a mental-fatigue protocol (a 30-minute computerized color-word Stroop interference task). Protocol order will be randomized and stratified by sex. In both protocols, participants will perform CMJs under three attentional-focus conditions, presented in a randomized order that is held constant within each participant across sessions: no prescribed focus, internal focus (attention directed to the participant's own body movements), and external focus (attention directed to the effect of movement on the environment). CMJ height will be recorded in centimeters using a validated video-based jump-analysis application (My Jump Lab) on a tablet camera recording at 240 frames per second, with the higher of two valid trials retained as the primary outcome for each protocol-by-focus condition.
Subjective mental fatigue will be assessed immediately before and after each protocol using a 0-10 visual analogue scale to confirm the effectiveness of the fatigue manipulation. Stroop task performance (total trials, accuracy) and adherence to the assigned attentional-focus instructions will be recorded as secondary measures.
The primary analysis will use a 2 (protocol: control, mental fatigue) x 3 (focus: no prescribed, internal, external) x 2 (sex: women, men) mixed-model ANOVA on CMJ height, with protocol and focus as within-participant factors and sex as a between-participant factor. Reporting will follow CONSORT 2025 and the CONSORT extension for randomized crossover trials.
Тип исследования
Интервенционный
Регистрация (Оцененный)
32
Фаза
- Непригодный
Контакты и местонахождение
В этом разделе приведены контактные данные лиц, проводящих исследование, и информация о том, где проводится это исследование.
Места учебы
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Malatya, Турция (Туркие), 44280
- İnönü University, Faculty of Sport Sciences
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Контакт:
- Oguzhan BOZKURT, PhD
- Номер телефона: +90 532 620 23 24
- Электронная почта: oguzhan.bozkurt@inonu.edu.tr
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Главный следователь:
- Oguzhan BOZKURT, PhD
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Критерии участия
Исследователи ищут людей, которые соответствуют определенному описанию, называемому критериям приемлемости. Некоторыми примерами этих критериев являются общее состояние здоровья человека или предшествующее лечение.
Критерии приемлемости
Возраст, подходящий для обучения
- Взрослый
Принимает здоровых добровольцев
Да
Описание
Inclusion Criteria:
- Age 18-30 years
- Third- or fourth-year undergraduate student in the Faculty of Sport Sciences, İnönü University
- Engaged in structured physical activity on at least 2 days per week
- Normal or corrected-to-normal vision and normal color vision
- Able to safely perform maximal vertical jumps
Exclusion Criteria:
- Major lower-extremity surgery or injury
- Musculoskeletal injury during the preceding 6 months that could affect jumping
- Diagnosed neurological, psychiatric, or cardiovascular disorder
- Regular use of medication that could influence alertness, fatigue, cardiovascular responses, or neuromuscular performance
- Any health condition compromising safety or measurement validity
Учебный план
В этом разделе представлена подробная информация о плане исследования, в том числе о том, как планируется исследование и что оно измеряет.
Как устроено исследование?
Детали дизайна
- Основная цель: Фундаментальная наука
- Распределение: Рандомизированный
- Интервенционная модель: Назначение кроссовера
- Маскировка: Нет (открытая этикетка)
Оружие и интервенции
Группа участников / Армия |
Вмешательство/лечение |
|---|---|
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Экспериментальный: Control-First Sequence
Participants complete the control protocol (30-min passive nature-video viewing) in the first session and the mental-fatigue protocol (30-min Stroop task) in the second session, separated by at least 72 hours.
In both sessions, participants perform countermovement jumps under three attentional-focus conditions (no prescribed focus, internal focus, external focus) in a randomized, participant-fixed order.
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Approximately 30 minutes of passive viewing of a narration-free nature video under standardized lighting, seating, and sound conditions, serving as the non-fatiguing control condition matched in duration to the mental-fatigue protocol.
A verbal cue delivered before each jump attempt with no directional attentional instruction: "When you are ready, jump as high as possible."
A verbal cue delivered before each jump attempt directing attention to the participant's own body movements: "When you are ready, focus on extending your knees and hips as quickly and explosively as possible while jumping as high as possible."
A verbal cue delivered before each jump attempt directing attention to the effect of movement on the environment: "When you are ready, focus on pushing the ground away from you as quickly and explosively as possible while jumping as high as possible."
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Экспериментальный: Mental-Fatigue-First Sequence
Participants complete the mental-fatigue protocol (30-min Stroop task) in the first session and the control protocol (30-min passive nature-video viewing) in the second session, separated by at least 72 hours.
In both sessions, participants perform countermovement jumps under three attentional-focus conditions (no prescribed focus, internal focus, external focus) in a randomized, participant-fixed order.
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A verbal cue delivered before each jump attempt with no directional attentional instruction: "When you are ready, jump as high as possible."
A verbal cue delivered before each jump attempt directing attention to the participant's own body movements: "When you are ready, focus on extending your knees and hips as quickly and explosively as possible while jumping as high as possible."
A verbal cue delivered before each jump attempt directing attention to the effect of movement on the environment: "When you are ready, focus on pushing the ground away from you as quickly and explosively as possible while jumping as high as possible."
A 30-minute computerized color-word Stroop interference task delivered as one uninterrupted block on a custom program, in which participants identify the font color of color-word stimuli while ignoring word meaning, inducing acute mental fatigue prior to countermovement jump testing.
Другие имена:
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Что измеряет исследование?
Первичные показатели результатов
Мера результата |
Мера Описание |
Временное ограничение |
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Countermovement Jump Height
Временное ограничение: Assessed once per attentional-focus condition (higher of two valid trials) approximately 30 seconds after completion of each 30-minute protocol (control or mental fatigue), across two sessions separated by at least 72 hours.
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Vertical jump height, measured in centimeters, recorded using a validated video-based jump-analysis application (My Jump Lab) at 240 frames per second.
The higher of two valid trials in each protocol-by-attentional-focus condition (control vs. mental fatigue x no prescribed focus, internal focus, external focus) will be retained as the outcome value for that condition.
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Assessed once per attentional-focus condition (higher of two valid trials) approximately 30 seconds after completion of each 30-minute protocol (control or mental fatigue), across two sessions separated by at least 72 hours.
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Вторичные показатели результатов
Мера результата |
Мера Описание |
Временное ограничение |
|---|---|---|
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Subjective Mental Fatigue Rating
Временное ограничение: Immediately before and immediately after each 30-minute protocol (control and mental fatigue), across two experimental sessions separated by at least 72 hours.
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Self-reported mental fatigue rated on a 0-10 visual analogue scale, in response to "How mentally fatigued do you feel right now?" (0 = not mentally fatigued at all, 10 = the highest possible level of mental fatigue).
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Immediately before and immediately after each 30-minute protocol (control and mental fatigue), across two experimental sessions separated by at least 72 hours.
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Stroop Task Performance
Временное ограничение: Continuously recorded throughout the 30-minute mental-fatigue protocol, administered in one of the two experimental sessions per participant (protocol order randomized).
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Total trials completed, number of correct and incorrect responses, and accuracy (%), recorded automatically by the Stroop task software during the mental-fatigue protocol.
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Continuously recorded throughout the 30-minute mental-fatigue protocol, administered in one of the two experimental sessions per participant (protocol order randomized).
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Focus-Instruction Adherence
Временное ограничение: Assessed once per attentional-focus condition, immediately after completion of each 30-minute protocol (control or mental fatigue), across two experimental sessions separated by at least 72 hours.
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Self-reported adherence to the assigned attentional-focus instructions, rated on a 0-10 visual analogue scale.
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Assessed once per attentional-focus condition, immediately after completion of each 30-minute protocol (control or mental fatigue), across two experimental sessions separated by at least 72 hours.
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Соавторы и исследователи
Здесь вы найдете людей и организации, участвующие в этом исследовании.
Спонсор
Даты записи исследования
Эти даты отслеживают ход отправки отчетов об исследованиях и сводных результатов на сайт ClinicalTrials.gov. Записи исследований и сообщаемые результаты проверяются Национальной медицинской библиотекой (NLM), чтобы убедиться, что они соответствуют определенным стандартам контроля качества, прежде чем публиковать их на общедоступном веб-сайте.
Изучение основных дат
Начало исследования (Оцененный)
1 сентября 2026 г.
Первичное завершение (Оцененный)
1 октября 2026 г.
Завершение исследования (Оцененный)
1 ноября 2026 г.
Даты регистрации исследования
Первый отправленный
17 августа 2026 г.
Впервые представлено, что соответствует критериям контроля качества
19 августа 2026 г.
Первый опубликованный (Действительный)
21 августа 2026 г.
Обновления учебных записей
Последнее опубликованное обновление (Действительный)
21 августа 2026 г.
Последнее отправленное обновление, отвечающее критериям контроля качества
19 августа 2026 г.
Последняя проверка
1 августа 2026 г.
Дополнительная информация
Термины, связанные с этим исследованием
Ключевые слова
Дополнительные соответствующие термины MeSH
Другие идентификационные номера исследования
- INU-2026-10953
- 2026/10953 (Другой идентификатор: Inonu University Scientific Research Ethics Committee for Health Sciences)
Планирование данных отдельных участников (IPD)
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НЕТ
Информация о лекарствах и устройствах, исследовательские документы
Изучает лекарственный продукт, регулируемый FDA США.
Нет
Изучает продукт устройства, регулируемый Управлением по санитарному надзору за качеством пищевых продуктов и медикаментов США.
Нет
Эта информация была получена непосредственно с веб-сайта clinicaltrials.gov без каких-либо изменений. Если у вас есть запросы на изменение, удаление или обновление сведений об исследовании, обращайтесь по адресу register@clinicaltrials.gov. Как только изменение будет реализовано на clinicaltrials.gov, оно будет автоматически обновлено и на нашем веб-сайте. .