Effects of Single-Leg Squat Exercises With Different Attentional Focus Techniques on Plantar Pressure Distribution and Posterior Chain Muscle Activation in Individuals With Unilateral Ankle Sprain
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 发起方
- 入组人数
- 32
- 试验地点
- 1
- 主要终点
- Muscle Activation (%MVIC)
研究概览
简要总结
This study investigates the acute effects of single-leg squat exercises conducted under different attentional focus strategies (internal, external, and no focus) on plantar pressure distribution and posterior chain muscle activation in individuals with a history of unilateral ankle sprain. The study aims to determine whether external focus improves neuromuscular efficiency and postural control compared to internal or no attentional focus.
详细描述
Unilateral ankle sprain is a common condition that compromises proprioception and neuromuscular control, often leading to chronic ankle instability. This randomized crossover trial examines the impact of attentional focus strategies during single-leg squats on surface electromyography (sEMG) activity of posterior chain muscles (gluteus medius, biceps femoris, lateral gastrocnemius, and peroneus) and plantar pressure parameters (COP path length and ellipse area) using pedobarographic analysis. Results may guide rehabilitation protocols by integrating cognitive-motor strategies for improved stability and performance.
研究设计
- 研究类型
- Interventional
- 分配方式
- Non Randomized
- 干预模型
- Crossover
- 主要目的
- Treatment
- 盲法
- Single (Outcomes Assessor)
盲法说明
Although participants and intervention providers were not masked due to the nature of attentional focus instructions, the outcomes assessor was blinded to the type of attentional focus condition applied during each trial. The assessor responsible for analyzing the sEMG and pedobarographic data was not present during exercise implementation and was unaware of the group assignments. Data files were coded and randomized before analysis to minimize detection bias and ensure objective evaluation.
入排标准
- 年龄范围
- 18 Years 至 25 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Healthy individuals aged approximately 18-25 years
- •History of unilateral ankle sprain
- •Ability to perform single-leg squat exercises
- •Willingness to provide written informed consent
排除标准
- •Acute musculoskeletal injuries preventing participation
- •Neurological or neuromuscular impairments
- •Uncorrected visual impairments
- •Recent surgery or conditions precluding safe exercise
结局指标
主要结局
Muscle Activation (%MVIC)
时间窗: Immediately post-intervention in a single session.
Measured via sEMG for Gluteus Medius, Biceps Femoris, Lateral Gastrocnemius, and Peroneus muscles during single-leg squats under each attentional focus condition.
Center of Pressure (COP) Path Length
时间窗: Immediately post-intervention in a single session.
Postural control was assessed immediately after each intervention using a pedobarographic platform. Participants stood barefoot on the affected leg for 30 seconds in a standardized posture (hands on hips, eyes open). The primary outcome in this measure is the COP path length, which represents the total displacement of the pressure center during the trial. Longer COP path lengths indicate greater postural instability. Data were sampled at 100 Hz and analyzed using standardized software to evaluate the immediate effects of attentional focus strategies on postural stability.
COP Ellipse Area
时间窗: Immediately post-intervention, in a single session.
In the same testing conditions as described above, the COP ellipse area was measured. This reflects the 95% confidence area of sway, providing a spatial measure of postural control. Larger ellipse areas denote impaired balance and increased sway. This variable was computed using pedobarographic data sampled at 100 Hz and processed with standardized software.
次要结局
未报告次要终点