The Effects of Stroboscopic Visual Conditions on Gait and Lower Limb Muscle Activity in Individuals With Chronic Ankle Instability
试验速览
- 阶段
- 不适用
- 状态
- 尚未招募
- 入组人数
- 25
- 试验地点
- 1
- 主要终点
- Change in Gait Velocity (cm/s) Under Different Stroboscopic Visual Conditions
研究概览
简要总结
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.
详细描述
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:
- High-frequency stroboscopic (rapid alternation)
- Low-frequency stroboscopic (slower alternation)
- No-glasses control (normal vision)
研究设计
- 研究类型
- Interventional
- 分配方式
- Na
- 干预模型
- Single Group
- 主要目的
- Basic Science
- 盲法
- None
入排标准
- 年龄范围
- 18 Years 至 45 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •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
排除标准
- •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
研究组 & 干预措施
Single Group - Chronic Ankle Instability
All participants with chronic ankle instability will complete walking trials under three visual conditions: high-frequency stroboscopic glasses, low-frequency stroboscopic glasses, and no-glasses control. Each participant will perform three 5-meter walking trials per condition, with the order of conditions randomized.
干预措施: Stroboscopic Visual Conditions (Behavioral)
结局指标
主要结局
Change in Gait Velocity (cm/s) Under Different Stroboscopic Visual Conditions
时间窗: Day 1 (single experimental session; immediately after each walking condition)
Gait velocity will be measured using the GAITRite system under three visual conditions: high-frequency stroboscopic, low-frequency stroboscopic, and no stroboscopic. Each participant will perform three walking trials per condition over a 5-meter walkway. The average gait velocity (cm/s) will be calculated for each condition.
次要结局
- Change in Step Length (cm) Under Different Stroboscopic Visual Conditions(Day 1 (single experimental session; immediately after each walking condition))
- Change in Step Width (cm) Under Different Stroboscopic Visual Conditions(Day 1 (single experimental session; immediately after each walking condition))
- Change in Swing Phase (%) Under Different Stroboscopic Visual Conditions(Day 1 (single experimental session; immediately after each walking condition))
- Change in Single Limb Support (%) Under Different Stroboscopic Visual Conditions(Day 1 (single experimental session; immediately after each walking condition))
- Change in Double Limb Support (%) Under Different Stroboscopic Visual Conditions(Day 1 (single experimental session; immediately after each walking condition))
- Change in Tibialis Anterior Muscle Activation (%MVIC) Under Different Stroboscopic Visual Conditions(Day 1 (single experimental session; immediately after each walking condition))
- Change in Peroneus Longus Muscle Activation (%MVIC) Under Different Stroboscopic Visual Conditions(Day 1 (single experimental session; immediately after each walking condition))
- Change in Gastrocnemius Muscle Activation (%MVIC) Under Different Stroboscopic Visual Conditions(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)(Day 1 (questionnaire administered before walking tasks))
- Correlation Between Foot and Ankle Ability Measure - Sports Subscale (FAAM-Sports) Score and Gait Velocity (cm/s)(Day 1 (questionnaire administered before walking tasks))
- Correlation Between Visual Analogue Scale (VAS) Pain Score and Gait Velocity (cm/s)(Day 1 (questionnaire administered before walking tasks))
- Correlation Between Identification of Functional Ankle Instability (IdFAI) Score and Gait Velocity (cm/s)(Day 1 (questionnaire administered before walking tasks))
研究者
Suhyeon Jeong
Principal Investigator, MSc Candidate, Department of Physical Therapy, Sahmyook University
Sahmyook University