The Effects of Stroboscopic Visual Conditions on Gait and Lower Limb Muscle Activity in Individuals With Chronic Ankle Instability
Ориентир для пациента и семьи
Простыми словами
Автоматическая сводка по структурированным данным реестра. Она помогает сориентироваться, но не заменяет официальный протокол или оценку врача.
- Что изучают
- В протоколе указаны: Stroboscopic Visual Conditions.
- Кому может быть актуально
- Состояния в реестре: Chronic Ankle Instability. Базовые параметры: 18 лет — 45 лет · Все.
- Что важно проверить
- Возраст, диагноз и пол — только базовые ориентиры. Предыдущее лечение, анализы и другие обязательные условия указаны ниже в критериях участия.
- Где проводится
- South Korea
- Следующий шаг
- Сохраните исследование, покажите его лечащему врачу и уточните актуальный статус у исследовательского центра. Расходы, документы и поездка →
Не всё понятно в терминах? Прочитайте наш гид для пациентов →
Обзор
This interventional study will investigate the effects of stroboscopic visual conditions on gait patterns and lower limb muscle activation in adults with chronic ankle instability (CAI). CAI often results in impaired sensorimotor control, leading to altered gait strategies such as slower walking speed, shorter step length, and increased visual reliance. Stroboscopic glasses intermittently restrict visual input, potentially reducing visual dependence and enhancing proprioceptive feedback. Participants will complete walking trials under three randomized visual conditions: high-frequency stroboscopic, low-frequency stroboscopic, and no-glasses control. Gait parameters will be measured using the GAITRite system, and surface electromyography (sEMG) will record activation of the tibialis anterior, peroneus longus, and gastrocnemius muscles. Findings may provide insight into sensorimotor adaptation mechanisms and inform rehabilitation strategies to improve functional stability in individuals with CAI.
Подробное описание
Chronic ankle instability (CAI) is a frequent outcome after ankle sprains, characterized by recurrent giving-way episodes, pain, and functional limitations. Approximately 40% of individuals with ankle sprains develop CAI, which is associated with deficits in proprioception, neuromuscular coordination, and postural stability. Increased visual reliance is a common compensatory strategy, but this can impair balance and gait when visual input is limited, raising the risk of re-injury.
Stroboscopic glasses alternate between transparent and opaque states, intermittently restricting visual information. This challenges the sensorimotor system, potentially reducing visual dependence and enhancing proprioceptive engagement. Prior research has shown benefits for static and dynamic balance, but little is known about effects on walking in CAI populations.
This randomized crossover study will assess the impact of high-frequency and low-frequency stroboscopic visual conditions compared with normal vision on gait and lower limb muscle activation in CAI. Adults aged 18-45 years with CAIT scores \< 24 and a history of ankle instability within 6 months will be recruited. Exclusion criteria include recent lower limb surgery/fracture, systemic conditions affecting balance, or inability to follow instructions.
Participants will perform walking trials on a 5-meter GAITRite walkway under three randomized visual conditions:
1. High-frequency stroboscopic (rapid alternation) 2. Low-frequency stroboscopic (slower alternation) 3. No-glasses control (normal vision)
Gait parameters (step length, step time, gait velocity, swing/stance phases) will be measured, and sEMG (Noraxon) will assess activation of the tibialis anterior, peroneus longus, and gastrocnemius, normalized to MVIC. Subjective measures include CAIT, FAAM, IdFAI, and VAS pain scores.
It is hypothesized that stroboscopic conditions will produce measurable changes in gait and muscle activity compared with control, reflecting adaptive sensorimotor strategies that can inform rehabilitation programs to improve stability, mobility, and reduce re-injury risk.
Вмешательства
- Поведенческое Stroboscopic Visual Conditions
Participants will perform walking trials under three visual conditions: high-frequency stroboscopic glasses, low-frequency stroboscopic glasses, and no-glasses control. Each participant will complete three 5-meter walking trials per condition, with the order of conditions randomized. Gait parameters will be recorded using the GAITRite walkway system, and muscle activity will be measured using surface electromyography.
Первичные конечные точки
- Change in Gait Velocity (cm/s) Under Different Stroboscopic Visual Conditions [Срок оценки: Day 1 (single experimental session; immediately after each walking condition)]
Вторичные конечные точки (12)
- Change in Step Length (cm) Under Different Stroboscopic Visual Conditions [Срок оценки: Day 1 (single experimental session; immediately after each walking condition)]
- Change in Step Width (cm) Under Different Stroboscopic Visual Conditions [Срок оценки: Day 1 (single experimental session; immediately after each walking condition)]
- Change in Swing Phase (%) Under Different Stroboscopic Visual Conditions [Срок оценки: Day 1 (single experimental session; immediately after each walking condition)]
- Change in Single Limb Support (%) Under Different Stroboscopic Visual Conditions [Срок оценки: Day 1 (single experimental session; immediately after each walking condition)]
- Change in Double Limb Support (%) Under Different Stroboscopic Visual Conditions [Срок оценки: Day 1 (single experimental session; immediately after each walking condition)]
- Change in Tibialis Anterior Muscle Activation (%MVIC) Under Different Stroboscopic Visual Conditions [Срок оценки: Day 1 (single experimental session; immediately after each walking condition)]
- Change in Peroneus Longus Muscle Activation (%MVIC) Under Different Stroboscopic Visual Conditions [Срок оценки: Day 1 (single experimental session; immediately after each walking condition)]
- Change in Gastrocnemius Muscle Activation (%MVIC) Under Different Stroboscopic Visual Conditions [Срок оценки: Day 1 (single experimental session; immediately after each walking condition)]
- Correlation Between Foot and Ankle Ability Measure - ADL Subscale (FAAM-ADL) Score and Gait Velocity (cm/s) [Срок оценки: Day 1 (questionnaire administered before walking tasks)]
- Correlation Between Foot and Ankle Ability Measure - Sports Subscale (FAAM-Sports) Score and Gait Velocity (cm/s) [Срок оценки: Day 1 (questionnaire administered before walking tasks)]
- Correlation Between Identification of Functional Ankle Instability (IdFAI) Score and Gait Velocity (cm/s) [Срок оценки: Day 1 (questionnaire administered before walking tasks)]
- Correlation Between Visual Analogue Scale (VAS) Pain Score and Gait Velocity (cm/s) [Срок оценки: Day 1 (questionnaire administered before walking tasks)]
Критерии участия
Критерии включения
- Individuals with a Cumberland Ankle Instability Tool (CAIT) score of less than 24
- Individuals diagnosed with ankle sprain or instability within the past 6 months
Критерии исключения
- Individuals who have undergone lower limb surgery or experienced a fracture due to ankle trauma within the past 6 months
- Individuals with systemic diseases, such as cardiovascular disorders, that may affect balance
- Individuals who have difficulty understanding or following instructions during assessment or training
Критерии приведены из реестра в оригинале (на английском). Окончательную оценку соответствия проводит исследовательский центр.
Здоровые добровольцы: Нет
Дизайн исследования
- Распределение
- Не применимо
- Модель
- Одна группа
- Маскирование
- Открытое
- Основная цель
- Фундаментальное исследование
Центры проведения
South Korea · 1 центр
- Sahmyook University — Seoul
Идентификаторы
NCT: NCT07134829 · SYU 2025-06-026-002