The Effect of a 6 Week Nordic Hamstring Exercise and an Assisted Nordic Hamstring Program on Hamstring Muscle Strength
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 38
- 试验地点
- 1
- 主要终点
- Hamstring strength endurance
研究概览
简要总结
This study aims to compare the effect of two hamstring strengthening programs on hamstring muscle strength in university students. 60 participants will be recruited for this study. They will be randomly assigned to one of two 6-week hamstring strengthening programs, namely the single leg bridge exercise and the Nordic hamstring exercise protocol, and one control group. Eccentric and isometric hamstring strength, gluteal strength and will sprint speed will be measured before and after the intervention.
详细描述
Participants will be recruited from the local university sports clubs. Club chairpersons will be asked to send an email to club players. Players interested in participating in the study will be asked to attend a meeting where the study will be explained to them. Those who were interested will then be assessed for inclusion and exclusion criteria.
Group allocation:
A four block randomization method will be used to allocate participants to the Nordic hamstring exercise protocol or the single leg bridge protocol.
Interventions:
The Nordic hamstring exercise program or the single leg bridge program.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Prevention
- 盲法
- Double (Investigator, Outcomes Assessor)
入排标准
- 年龄范围
- 18 Years 至 35 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •free from hamstring injury in the 6 months prior to the study
- •currently competing in team sports at least three occasions per week
排除标准
- •history of a hip or knee injury in the 3 months prior to the study
- •a history of anterior cruciate ligament rupture
- •a history of involvement in a hamstring strengthening, injury prevention programme in the 3 months prior to the study.
研究组 & 干预措施
Nordic hamstring exercise program
Participants are required to kneel on a gym mat keeping their hips in a slightly flexed position and to slowly lower themselves in a controlled manner as far as they could towards the ground. When they can no longer lower themselves as such, they are instructed to utilise their arms to buffer the fall and touch their chest off the ground, while maintaining tension in their hamstrings. Once their chest touches the ground they are instructed to immediately return to the starting position by pushing up with their hands
干预措施: Nordic hamstring exercise program (Other)
Assisted nordic hamstring exercise program
Participants are required to kneel on a gym mat keeping their hips in a slightly flexed position and to slowly lower themselves in a controlled manner as far as they could towards the ground. During this exercise, participants are attached to a weighted pulley cable system via a chest attachment. A sufficient amount of assistance is given to allow the participant to lower to 30 degrees of knee flexion. When they can no longer lower themselves as such, they are instructed to utilise their arms to buffer the fall and touch their chest off the ground, while maintaining tension in their hamstrings. Once their chest touches the ground they are instructed to immediately return to the starting position by pushing up with their hands
干预措施: Assisted nordic hamstring exercise program (Other)
结局指标
主要结局
Hamstring strength endurance
时间窗: Change from baseline after 6 weeks
This will be measured by assessing the number of repetitions of the single leg bridge exercise to failure
Eccentric hamstring strength
时间窗: Change from baseline after 6 weeks
This will be measured using devices that measure the eccentric strength of the hamstrings during the Nordic hamstring exercise. The devices are called the Hamstring Solo device and the Nordbord device. Participants will kneel on the padded surface of the device with their lower limbs held in position just above the ankles. The ankle supports have load sensitive cells. The participants will be asked to complete the nordic hamstring exercise. This involves them folding their arms across their chest and slowly lowering themselves towards the ground by allowing their knees to slowly straighten. The load cells will record the force (newtons) during the exercise for each leg.
Eccentric hamstring moment
时间窗: Change from baseline after 6 weeks
This will be measured using devices that measure the eccentric strength of the hamstrings during the Nordic hamstring exercise. The devices are called the Hamstring Solo device and the Nordbord device. Participants will kneel on the padded surface of the device with their lower limbs held in position just above the ankles. The ankle supports have load sensitive cells. The participants will be asked to complete the nordic hamstring exercise. This involves them folding their arms across their chest and slowly lowering themselves towards the ground by allowing their knees to slowly straighten. The load cells will record the force (newtons) during the exercise for each leg. The distance from the load cells to the knee joint will be measured (meters) to calculate the moment in Newton meters for the exercise
次要结局
- Muscle soreness ratings following exercise(immediately following each session)
- between limb asymmetries in hamstring strength, moment and endurance.(Change from baseline after 6 weeks)
研究者
Enda Whyte
Assistant Professor
Dublin City University