Mental Fatigue Effects on Posture and Spinal Reflexes
Effects of Mental Fatigue on Posture and Spinal Reflexes Modulations
This randomized crossover study investigates the effects of mental fatigue on postural control and spinal reflex excitability in healthy physically active adults aged 18-35 years. Participants will complete two experimental conditions: a mentally fatiguing Stroop task and a control condition involving passive documentary watching, separated by at least 48 hours. Postural control will be assessed using force plate measures of center of pressure displacement during bipedal and unipedal stance, with and without concurrent cognitive dual-tasking. In parallel, spinal reflex excitability will be evaluated using H-reflex recordings from the triceps surae muscles across sitting and standing postures.
The primary aim is to determine whether mental fatigue increases postural sway, particularly in more challenging balance conditions such as single-leg stance. The secondary aim is to examine whether mental fatigue alters the normal modulation of spinal reflex excitability across progressively demanding postural tasks. Additional biomechanical and neuromuscular measures, including EMG activity and hip kinematics, will be recorded to provide insight into underlying control mechanisms.
The study will include approximately 26 participants, with each serving as their own control. Data will contribute to understanding how cognitive fatigue influences balance control and spinal-level neuromuscular regulation.
調査の概要
研究の種類
入学 (推定)
段階
- 適用できない
連絡先と場所
研究連絡先
- 名前：Sidney Grosprêtre, PhD
- 電話番号：+32 (0)2 629 22 22
- メール：sidney.grospretre@univ-fcomte.fr
研究場所
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Pleinlaan 2
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Brussels、Pleinlaan 2、ベルギー、1050
- Vrije Universiteit Brussel
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コンタクト：
- Sidney Grosprêtre, PhD
- 電話番号：+32 (0)2 629 22 22
- メール：sidney.grospretre@univ-fcomte.fr
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参加基準
適格基準
就学可能な年齢
- 大人
健康ボランティアの受け入れ
説明
Inclusion Criteria:
- Healthy participants aged between 18 and 35 years
- Recreational active
Exclusion Criteria:
- Previous major lower limb injury (last 6 months)
- Present neurological or musculoskeletal disorders
- Involvement in another concurrent physical or cognitive intervention study
研究計画
研究はどのように設計されていますか？
デザインの詳細
- 主な目的：基礎科学
- 割り当て：ランダム化
- 介入モデル：クロスオーバー割り当て
- マスキング：独身
武器と介入
参加者グループ / アーム |
介入・治療 |
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実験的：Control Condition
Participants watch a 60-minute neutral documentary of their choice.
This condition is designed to control for time, visual input, and arousal without inducing mental fatigue.
Postural control and spinal reflex excitability are assessed immediately before and after the task.
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Participants watch a 60-minute neutral documentary of their choice.
This condition is designed to match the mental fatigue intervention in duration and general sensory engagement without inducing cognitive fatigue.
No cognitive task performance is required.
Subjective mental fatigue is assessed at equivalent time points using a visual analogue scale.
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実験的：Mental Fatigue Condition
Participants complete a 60-minute computerized Stroop task designed to induce mental fatigue.
The task involves continuous performance of color-word interference trials adjusted to individual capacity.
Postural control and spinal reflex excitability are assessed immediately before and after the task.
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Participants complete a 60-minute computerized Stroop color-word task designed to induce mental fatigue.
The task consists of repeated incongruent stimuli requiring rapid and accurate responses, with difficulty individualized based on a prior maximal Stroop performance test.
Performance (reaction time and accuracy) is continuously recorded.
Subjective mental fatigue is assessed intermittently during the task using a visual analogue scale.
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この研究は何を測定していますか？
主要な結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
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Center of Pressure (CoP) Displacement (Postural Sway)
時間枠：Pre-intervention and immediately post-intervention (each experimental session)
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Postural sway will be assessed using center of pressure (CoP) displacement area and oscillation parameters measured during bipedal and unipedal stance on a force plate.
Higher values indicate greater postural instability.
Comparisons will be made between mental fatigue and control conditions, pre- and post-intervention.
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Pre-intervention and immediately post-intervention (each experimental session)
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Subjective Mental Fatigue
時間枠：During intervention (every 15 minutes) and immediately post-intervention
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Subjective mental fatigue will be assessed using a visual analog scale (VAS) ranging from 0 (no fatigue) to 100 (extreme fatigue).
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During intervention (every 15 minutes) and immediately post-intervention
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二次結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
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Spinal Reflex Excitability (H-reflex Modulation)
時間枠：Pre-intervention and immediately post-intervention across sitting, bipedal stance, and unipedal stance conditions
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Spinal reflex excitability will be assessed using H-reflex amplitude (H50 and Hmax), normalized to maximal M-wave (Mmax), recorded from the triceps surae muscles (soleus, medial gastrocnemius, lateral gastrocnemius) during sitting, bipedal stance, and unipedal stance.
Changes will be compared between mental fatigue and control conditions.
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Pre-intervention and immediately post-intervention across sitting, bipedal stance, and unipedal stance conditions
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Surface Electromyography (EMG) Activity of Postural Muscles
時間枠：Continuous recording during postural tasks, pre-intervention and immediately post-intervention (each condition)
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Muscle activation will be assessed using root mean square (RMS) electromyography (EMG) activity recorded from the soleus, medial gastrocnemius, lateral gastrocnemius, tibialis anterior, vastus medialis, and multifidus muscles, normalized to maximal M-wave (MMAX).
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Continuous recording during postural tasks, pre-intervention and immediately post-intervention (each condition)
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Hip / Leg Movement (IMU Angular Velocity)
時間枠：Pre-intervention and immediately post-intervention during bipedal and unipedal stance
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Hip and leg movements will be assessed using inertial measurement unit (IMU) sensors placed at the proximal femoral epicondyle.
Outcome is the resultant angular velocity across movement axes during postural tasks.
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Pre-intervention and immediately post-intervention during bipedal and unipedal stance
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協力者と研究者
捜査官
- スタディディレクター：Bart Roelands, Professor、Vrije Universiteit Brussel
研究記録日
主要日程の研究
研究開始 (推定)
一次修了 (推定)
研究の完了 (推定)
試験登録日
最初に提出
QC基準を満たした最初の提出物
最初の投稿 (実際)
学習記録の更新
投稿された最後の更新 (実際)
QC基準を満たした最後の更新が送信されました
最終確認日
詳しくは
本研究に関する用語
その他の研究ID番号
- MFspinal
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