Effects of Mental Fatigue Duration on Cortical Activity and Jump Performance (MF-CMJ-EEG)
2026년 8월 4일 업데이트: Oğuzhan Bozkurt, Inonu University
Duration-Dependent Effects of Mental Fatigue on Cortical Activation Patterns and Lower-Limb Explosive Performance
"This study investigates whether the length of time spent on a mentally demanding task affects brain activity and jumping performance in physically active young men.
Twelve healthy male university students, all regularly engaged in sport, completed four separate testing sessions on different days, each at least 72 hours apart.
In one session (the control condition), participants watched a calm nature documentary.
In the other three sessions, mental fatigue was induced by having participants perform a demanding attention task (the Stroop color-word test) continuously for 10, 15, or 30 minutes.
Before and after each session, brain activity was recorded using electroencephalography (EEG), a painless method that measures electrical activity through sensors placed on the scalp.
Immediately afterward, participants performed a countermovement jump test, a standard measure of explosive leg power used in sports science.
The study examines whether longer periods of mental fatigue produce progressively larger changes in brain activity and jump performance, and whether changes in brain activity are related to changes in jumping ability.
The findings may help athletes, coaches, and students better understand how mentally tiring activities, such as studying or exams, could affect physical performance shortly afterward."
연구 개요
상태
완전한
상세 설명
"Mental fatigue is a psychobiological state induced by prolonged demanding cognitive activity, characterized by subjective tiredness and measurable decrements in sustained attention and executive control. While mental fatigue has been linked to impairments in endurance, strength, and anaerobic performance, evidence regarding explosive, single-effort tasks such as the countermovement jump (CMJ) remains sparse and inconsistent, and it remains unclear whether the cortical and behavioral consequences of mental fatigue scale with the duration of the inducing cognitive task.
This study used a single-group, repeated-measures crossover design in which the same twelve participants completed a non-fatiguing control condition and three graded mental-fatigue protocols (10, 15, and 30 minutes of continuous Stroop-task performance), with session order counterbalanced across participants and a minimum 72-hour washout between sessions. All sessions were conducted in the same laboratory within a consistent daily time window (10:00 ± 1 hour) to minimize circadian confounds.
Resting-state EEG (spectral power in delta, theta, alpha, and beta bands; theta/alpha and theta/beta ratios; spectral and sample entropy; frontal theta and posterior alpha) and subjective fatigue (0-10 visual analogue scale) were assessed immediately before and after each condition. Countermovement-jump height and its kinetic/kinematic correlates were then measured to evaluate explosive lower-limb power, the study's primary outcome; EEG parameters were treated as secondary, mechanistic outcomes.
Data were analyzed using repeated-measures ANOVA, Holm-Bonferroni-corrected Friedman/Wilcoxon tests where appropriate, and repeated-measures correlation to examine the relationship between post-intervention EEG parameters and CMJ performance. The study tested the hypothesis that increasing Stroop-task duration would produce progressively larger shifts in EEG-derived cortical activation and parallel reductions in CMJ performance, and that these neurophysiological and performance changes would be significantly associated with one another."
연구 유형
중재적
등록 (실제)
12
단계
- 해당 없음
연락처 및 위치
이 섹션에서는 연구를 수행하는 사람들의 연락처 정보와 이 연구가 수행되는 장소에 대한 정보를 제공합니다.
연구 장소
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Malatya, 터키 (Türkiye), 44280
- İnönü University, Faculty of Sport Sciences
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참여기준
연구원은 적격성 기준이라는 특정 설명에 맞는 사람을 찾습니다. 이러한 기준의 몇 가지 예는 개인의 일반적인 건강 상태 또는 이전 치료입니다.
자격 기준
공부할 수 있는 나이
- 성인
건강한 자원 봉사자를 받아들입니다
예
설명
Inclusion Criteria:
- Healthy male volunteers aged 18-30 years
- Enrolled in the Faculty of Sport Sciences at İnönü University
- Engaged in structured exercise at least three days per week
- Free of any neurological, psychiatric, cardiovascular, or musculoskeletal disorder
- Normal or corrected-to-normal vision
- Physically capable of completing the experimental protocol safely
Exclusion Criteria:
- Diagnosed neurological, psychiatric, cardiovascular, or musculoskeletal disorder
- Lower-limb injury within the preceding 6 months
- Use of medication known to affect central nervous system function
- Prior diagnosis of a sleep disorder
- Uncorrectable visual impairment or any disturbance of color perception
- Cognitive or sensory limitation likely to interfere with performance of the Stroop task
- Failure to complete a session in full, non-compliance with investigator instructions during testing, inability to produce an EEG recording of analyzable quality for technical reasons, or discontinuation of the experimental procedure for any reason
- Non-compliance with pre-session restrictions (vigorous physical exercise or alcohol consumption within 24 hours before each session; caffeine, energy drinks, or other stimulant substances within 12 hours before each session)
공부 계획
이 섹션에서는 연구 설계 방법과 연구가 측정하는 내용을 포함하여 연구 계획에 대한 세부 정보를 제공합니다.
연구는 어떻게 설계됩니까?
디자인 세부사항
- 주 목적: 치료
- 할당: 무작위
- 중재 모델: 크로스오버 할당
- 마스킹: 하나의
무기와 개입
참가자 그룹 / 팔 |
개입 / 치료 |
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가짜 비교기: Control
Participants viewed a neutral, cognitively undemanding nature documentary for a duration matched to the mental-fatigue protocols, without performing the Stroop task.
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Viewing of a neutral, cognitively undemanding nature documentary matched in duration to the mental-fatigue protocols, serving as a non-fatiguing control condition.
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실험적: MF10 (10-min Mental Fatigue)
Participants performed the Stroop color-word task continuously for 10 minutes to induce mental fatigue.
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Continuous performance of the Stroop color-word interference task for 10 minutes to induce mental fatigue.
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실험적: MF15 (15-min Mental Fatigue)
Participants performed the Stroop color-word task continuously for 15 minutes to induce mental fatigue.
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Continuous performance of the Stroop color-word interference task for 15 minutes to induce mental fatigue.
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실험적: MF30 (30-min Mental Fatigue)
Participants performed the Stroop color-word task continuously for 30 minutes to induce mental fatigue.
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Continuous performance of the Stroop color-word interference task for 30 minutes to induce mental fatigue.
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연구는 무엇을 측정합니까?
주요 결과 측정
결과 측정 |
측정값 설명 |
기간 |
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Countermovement Jump (CMJ) Height
기간: Immediately after completion of each experimental protocol (control, and 10-, 15-, and 30-minute Stroop-task mental fatigue conditions); sessions were separated by a minimum 72-hour washout period.
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Countermovement jump (CMJ) height was assessed using the My Jump Lab application (version 5.2; C. Balsalobre-Fernández, Madrid, Spain) via video recorded at 240 frames/s on an iPad Air 11-inch (M3), positioned on a tripod approximately 2 m from the participant.
Take-off and landing frames were identified manually by the same investigator using the application's frame-by-frame function, and jump height was calculated from flight time using the equation h = (g·t²)/8.
Two jump attempts were performed in each experimental session, with 60 seconds of rest between trials, and the better performance was retained for analysis.
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Immediately after completion of each experimental protocol (control, and 10-, 15-, and 30-minute Stroop-task mental fatigue conditions); sessions were separated by a minimum 72-hour washout period.
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2차 결과 측정
결과 측정 |
측정값 설명 |
기간 |
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Countermovement Jump-Derived Mechanical and Kinematic Parameters
기간: Immediately after completion of each experimental protocol.
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Countermovement jump (CMJ)-derived mechanical and kinematic parameters were obtained using the My Jump Lab application from the CMJ assessment performed at the end of each experimental protocol.
Average velocity (m/s), take-off velocity (m/s), and impulse (N·s) were provided automatically by the application as derived sub-parameters, computed from jump height and body mass using the biomechanical model incorporated in My Jump Lab.
Flight time (ms) was calculated from the same video recording using the application's frame-by-frame analysis.
These parameters were analyzed as complementary derived measures of CMJ performance.
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Immediately after completion of each experimental protocol.
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EEG Absolute Band Power (Delta, Theta, Alpha, Beta)
기간: Recorded immediately before and immediately after each experimental protocol (control, and 10-, 15-, and 30-minute Stroop-task mental fatigue conditions); each recording lasted 3 minutes with eyes closed.
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Resting-state EEG was recorded using a 10-electrode montage (Fp1, Fp2, Fz, FC1, FC2, Cz, Pz, O1, Oz, O2) following the international 10-20 system, via a wireless EEG system (Emotiv EPOC Flex) sampling at 256 Hz.
Following preprocessing (0.5-45 Hz band-pass filtering, ICA-based artifact removal, and amplitude normalization), power spectral density was computed for each channel using Welch's method, and absolute power was calculated within the delta (1-4 Hz), theta (4-8 Hz), alpha (8-13 Hz), and beta (13-30 Hz) frequency bands, expressed in normalized (dimensionless) units.
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Recorded immediately before and immediately after each experimental protocol (control, and 10-, 15-, and 30-minute Stroop-task mental fatigue conditions); each recording lasted 3 minutes with eyes closed.
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EEG Theta/Beta Ratio
기간: Immediately before and immediately after each experimental protocol.
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The theta-to-beta power ratio was calculated from resting-state EEG recordings (10-electrode montage, international 10-20 system) by dividing theta-band power by beta-band power for each channel.
The outcome was expressed as a unitless ratio.
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Immediately before and immediately after each experimental protocol.
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EEG Spectral Entropy
기간: Immediately before and immediately after each experimental protocol.
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Spectral entropy was computed from the resting-state EEG power spectrum of each channel as a measure of signal complexity, used to characterize the transition from an alert to a fatigued cortical state.
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Immediately before and immediately after each experimental protocol.
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EEG Sample Entropy
기간: Immediately before and immediately after each experimental protocol.
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Sample entropy was computed from the resting-state EEG time series of each channel as a nonlinear measure of signal irregularity and complexity.
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Immediately before and immediately after each experimental protocol.
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Frontal Theta Power
기간: Immediately before and immediately after each experimental protocol.
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Frontal theta power was extracted from frontal electrode sites (Fp1, Fp2, Fz) as a regional marker of cognitive-control demand and effortful attentional monitoring.
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Immediately before and immediately after each experimental protocol.
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Posterior Alpha Power
기간: Immediately before and immediately after each experimental protocol.
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Posterior alpha power was extracted from occipital electrode sites (O1, Oz, O2) as a regional marker of cortical inhibition and fatigue-related attentional state.
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Immediately before and immediately after each experimental protocol.
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Subjective Mental Fatigue (VAS Score)
기간: Immediately before and immediately after each experimental protocol.
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Subjective mental fatigue was rated using a paper-based 0-10 visual analogue scale, anchored at 0 ("not mentally fatigued at all") and 10 ("the highest possible level of mental fatigue"), in response to the question "How mentally fatigued do you feel right now?" Prior ratings were not visible when a new rating was provided.
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Immediately before and immediately after each experimental protocol.
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공동 작업자 및 조사자
여기에서 이 연구와 관련된 사람과 조직을 찾을 수 있습니다.
스폰서
연구 기록 날짜
이 날짜는 ClinicalTrials.gov에 대한 연구 기록 및 요약 결과 제출의 진행 상황을 추적합니다. 연구 기록 및 보고된 결과는 공개 웹사이트에 게시되기 전에 특정 품질 관리 기준을 충족하는지 확인하기 위해 국립 의학 도서관(NLM)에서 검토합니다.
연구 주요 날짜
연구 시작 (실제)
2026년 5월 1일
기본 완료 (실제)
2026년 7월 1일
연구 완료 (실제)
2026년 8월 1일
연구 등록 날짜
최초 제출
2026년 8월 4일
QC 기준을 충족하는 최초 제출
2026년 8월 4일
처음 게시됨 (실제)
2026년 8월 10일
연구 기록 업데이트
마지막 업데이트 게시됨 (실제)
2026년 8월 10일
QC 기준을 충족하는 마지막 업데이트 제출
2026년 8월 4일
마지막으로 확인됨
2026년 8월 1일
추가 정보
이 연구와 관련된 용어
추가 관련 MeSH 약관
기타 연구 ID 번호
- INU-2025-8104-MFCMJ
- 2025/8104 (기타 식별자: İnönü University Non-Interventional Clinical Research Ethics Committee)
개별 참가자 데이터(IPD) 계획
개별 참가자 데이터(IPD)를 공유할 계획입니까?
아니요
IPD 계획 설명
Individual participant data will not be shared because the study includes a small sample size, and no data-sharing plan was included in the approved study protocol or informed consent.
Aggregate study results will be reported in scientific publications.
약물 및 장치 정보, 연구 문서
미국 FDA 규제 의약품 연구
아니
미국 FDA 규제 기기 제품 연구
아니
이 정보는 변경 없이 clinicaltrials.gov 웹사이트에서 직접 가져온 것입니다. 귀하의 연구 세부 정보를 변경, 제거 또는 업데이트하도록 요청하는 경우 register@clinicaltrials.gov. 문의하십시오. 변경 사항이 clinicaltrials.gov에 구현되는 즉시 저희 웹사이트에도 자동으로 업데이트됩니다. .