Comparison of Lower Limb COP and Muscle Activation During Single-Leg Deadlift Using Elastic and Inelastic Barbells
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 发起方
- 入组人数
- 27
- 试验地点
- 2
- 主要终点
- Center of Pressure Displacement - Anterior-Posterior (AP)
研究概览
简要总结
This study aims to investigate the effects of barbell type (elastic vs. inelastic) and lifting speed on lower limb balance and muscle activation during the Single-Leg Deadlift (SLDL) exercise. Using a randomized crossover design, healthy adults performed SLDL at three different movement speeds while center of pressure (COP) and electromyographic (EMG) responses were measured. The study seeks to determine whether elastic barbells, which create top-down perturbations, enhance neuromuscular control and postural stability more effectively than traditional inelastic barbells.
详细描述
This randomized clinical trial examines how barbell type and movement speed affect lower limb stability and muscle activation during Single-Leg Deadlift (SLDL) exercises. The intervention compares elastic barbells-designed to generate upper-limb-initiated dynamic perturbations-to conventional inelastic barbells. Twenty-seven healthy adults with prior resistance training experience participated in the study. All participants performed SLDL using both barbell types across three speeds: normal (2 seconds), fast (1 second), and power (as fast as possible).
Center of Pressure (COP) data were recorded using a force platform to assess anterior-posterior (AP) and medial-lateral (ML) sway. Surface electromyography (EMG) was collected from eight lower limb muscles to evaluate neuromuscular responses. Data were analyzed using two-way repeated measures ANOVA.
The findings revealed that elastic barbells significantly reduced COP displacement and increased activation in the gluteus medius, biceps femoris, semitendinosus, and gastrocnemius muscles-particularly at high movement speeds. These results suggest that elastic barbells may improve dynamic stability and neuromuscular coordination, offering potential applications in sports rehabilitation and unilateral training programs.
研究设计
- 研究类型
- Interventional
- 分配方式
- Na
- 干预模型
- Single Group
- 主要目的
- Treatment
- 盲法
- None
入排标准
- 年龄范围
- 18 Years 至 —（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •No history of musculoskeletal disorders in the past 6 months
- •At least 1 year of experience in resistance or functional training
- •Able to perform single-leg deadlift exercise safely
- •Provided written informed consent
排除标准
- •History of lower extremity surgery or major musculoskeletal injury within the past year
- •Current pain or symptoms in the hip, knee, or ankle joints
- •Neurological, cardiovascular, or balance disorders
- •Participation in other conflicting research studies within the last 3 months
- •Inability to maintain single-leg stance for at least 5 seconds
- •Presence of skin irritation or condition at electrode placement sites
结局指标
主要结局
Center of Pressure Displacement - Anterior-Posterior (AP)
时间窗: During single-leg deadlift task (within single session)
The range of anterior-posterior (AP) sway displacement (in centimeters) will be measured using a force platform (AMTI OR6). Participants perform SLDL under both barbell conditions at three different movement speeds. Lower values indicate greater postural stability.
Center of Pressure Displacement - Medial-Lateral (ML)
时间窗: During single-leg deadlift task (within single session)
The range of medial-lateral (ML) sway displacement (in centimeters) will be measured using a force platform (AMTI OR6). The COP variability is analyzed as an indicator of dynamic balance control.
Muscle Activation of Lower Limb Muscles (%MVIC)
时间窗: During single-leg deadlift task (within single session)
Surface electromyography (EMG) will be used to measure muscle activation in eight lower limb muscles during single-leg deadlifts under elastic and inelastic barbell conditions at three movement speeds (normal, fast, power). The muscles assessed include gluteus medius, rectus femoris, vastus medialis, vastus lateralis, biceps femoris, semitendinosus, gastrocnemius, and tibialis anterior. EMG signals will be processed using RMS and normalized to maximum voluntary isometric contraction (%MVIC). Increased %MVIC indicates higher neuromuscular demand under perturbation.
次要结局
未报告次要终点
研究者
Ji Hwan Jeong
Principal Investigator
Busan University of Foreign Studies