Changes in Biceps Femoris Architecture, Hamstrings Eccentric Strength, and Sprint Performance Following Romanian Deadlift vs. Nordic Hamstring Exercise Intervention
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 32
- 试验地点
- 1
- 主要终点
- Biceps femoris long head fascicle length
研究概览
简要总结
The overall goal of this study is to investigate the effects of a 6-week training program between two hamstring exercises-the Romanian deadlift (RDL) and the Nordic hamstring exercise (NHE)-on hamstring strain injury risk factors and sprint performance.
详细描述
Prior to the intervention, participants will report to the lab on one occasion for baseline assessments. During the baseline visit, a) regional measures of biceps femoris long head fascicle length, pennation angle, muscle thickness, and anatomical cross-sectional area will be determined using ultrasound, b) baseline NHE strength and 3RM for the RDL will be determined, and c) maximal 60 m sprint performance will be measured.
Participants will be randomly assigned to either the RDL or NHE. After randomization, each participant will undergo the 6 week intervention program based upon their group allocation. Exercises will be performed using a 6 second eccentric (i.e., lowering) contraction.
Following the 6 week intervention, participants would return to the lab for post-intervention assessments of regional hamstring morphology and architecture and sprint testing, which would be carried out in the same manner as baseline assessments. Since fascicle length changes are known to return to baseline values within 2 weeks after the cessation of eccentric training, participants will be asked to return to the lab following a 2 week detraining period where final imaging, strength, and sprint performance assessments will be determined.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Other
- 盲法
- Double (Investigator, Outcomes Assessor)
入排标准
- 年龄范围
- 18 Years 至 25 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •18-25 years of age
- •Have >6 months experience in resistance training
排除标准
- •History of hamstring strain injury within the last 12 months
- •History of lower extremity surgery
- •Current musculoskeletal injury to the lower extremity
- •Females who are currently pregnant
- •Individuals who indicate they are unwilling to refrain from novel outside training activities
- •Individuals who do not complete 75% (9 out of 12) of the training sessions
研究组 & 干预措施
Romanian Deadlift
The training intervention groups will undergo the same program with the only difference being the interventional hamstring exercise. The program will consist of a 2-week acclimatization period followed by 4-weeks of progressive training. The RDL will be performed with a 6 second eccentric component with the athlete returning to the start position with a maximal concentric hip extension.
干预措施: Ultrasound imaging (Diagnostic Test)
Romanian Deadlift
The training intervention groups will undergo the same program with the only difference being the interventional hamstring exercise. The program will consist of a 2-week acclimatization period followed by 4-weeks of progressive training. The RDL will be performed with a 6 second eccentric component with the athlete returning to the start position with a maximal concentric hip extension.
干预措施: Hamstring Eccentric Strength Testing (Other)
Romanian Deadlift
The training intervention groups will undergo the same program with the only difference being the interventional hamstring exercise. The program will consist of a 2-week acclimatization period followed by 4-weeks of progressive training. The RDL will be performed with a 6 second eccentric component with the athlete returning to the start position with a maximal concentric hip extension.
干预措施: Maximal 60 m Sprint (Other)
Romanian Deadlift
The training intervention groups will undergo the same program with the only difference being the interventional hamstring exercise. The program will consist of a 2-week acclimatization period followed by 4-weeks of progressive training. The RDL will be performed with a 6 second eccentric component with the athlete returning to the start position with a maximal concentric hip extension.
干预措施: Romanian Deadlift (Other)
Nordic Hamstring Exercise
The training intervention groups will undergo the same program with the only difference being the interventional hamstring exercise. The program will consist of a 2-week acclimatization period followed by 4-weeks of progressive training. During the acclimatization period, the relative intensity will be lower compared to the 4-week progressive training to ensure each participant performs the exercise with proper technique. During the subsequent progressive training weeks, the participants will perform the NHE without the bands.
干预措施: Ultrasound imaging (Diagnostic Test)
Nordic Hamstring Exercise
The training intervention groups will undergo the same program with the only difference being the interventional hamstring exercise. The program will consist of a 2-week acclimatization period followed by 4-weeks of progressive training. During the acclimatization period, the relative intensity will be lower compared to the 4-week progressive training to ensure each participant performs the exercise with proper technique. During the subsequent progressive training weeks, the participants will perform the NHE without the bands.
干预措施: Hamstring Eccentric Strength Testing (Other)
Nordic Hamstring Exercise
The training intervention groups will undergo the same program with the only difference being the interventional hamstring exercise. The program will consist of a 2-week acclimatization period followed by 4-weeks of progressive training. During the acclimatization period, the relative intensity will be lower compared to the 4-week progressive training to ensure each participant performs the exercise with proper technique. During the subsequent progressive training weeks, the participants will perform the NHE without the bands.
干预措施: Maximal 60 m Sprint (Other)
Nordic Hamstring Exercise
The training intervention groups will undergo the same program with the only difference being the interventional hamstring exercise. The program will consist of a 2-week acclimatization period followed by 4-weeks of progressive training. During the acclimatization period, the relative intensity will be lower compared to the 4-week progressive training to ensure each participant performs the exercise with proper technique. During the subsequent progressive training weeks, the participants will perform the NHE without the bands.
干预措施: Nordic hamstring exercise (Other)
结局指标
主要结局
Biceps femoris long head fascicle length
时间窗: Post 2 week de-training (8 weeks)
Biceps femoris long head fascicle length
时间窗: Baseline
Biceps femoris long head fascicle length
时间窗: Post-intervention (6 weeks)
次要结局
- Biceps femoris long head anatomical cross sectional area(Baseline, Post-intervention (6 weeks), Post 2 week de-training (8 weeks))
- Romanian deadlift (RDL) 3-repetition maximal strength(Baseline, Post-intervention (6 weeks), Post 2 week de-training (8 weeks))
- Nordic hamstring exercise (NHE) maximal strength(Baseline, Post-intervention (6 weeks), Post 2 week de-training (8 weeks))
- Maximal 60 m sprint times(Baseline, Post-intervention (6 weeks), Post 2 week de-training (8 weeks))
- Biceps femoris long head muscle thickness(Baseline, Post-intervention (6 weeks), Post 2 week de-training (8 weeks))
- Biceps femoris long head pennation angle(Baseline, Post-intervention (6 weeks), Post 2 week de-training (8 weeks))