The Impact of Unilateral Lumbar Mobilisations on Hamstring Strength, sEMG Activity and Failure Point of the Hamstring Nordic Exercise
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 24
- 试验地点
- 2
- 主要终点
- Hamstring Peak Force
研究概览
简要总结
The aim of this study is to build on previous published work, which has indicated lumbar mobilisations have the ability to increase hamstring extensibility and decrease muscle activity. The primary aim of this project is investigate if lumbar mobilisations have an affect on the Nordic Hamstring exercise.
Aim: To investigate the short-term effects L4 and L5 Unilateral Posterior Anterior (UPA) Mobilisations on the lumbar spine on the Nordic Hamstring Exercise. Measures will include hamstring peak torque, sEMG activity and knee angle at first rapid change in angular acceleration.
详细描述
The study aims to investigate the short-term effects L4 and L5 Unilateral Posterior Anterior (UPA) Mobilisations on the lumbar spine on the Nordic Hamstring Exercise. Measures will include hamstring peak torque, sEMG activity and knee angle at first rapid change in angular acceleration.
Recruitment will take place via flyer and email. All testing will take place in the biodex laboratory at Teesside University. Due to the nature of the cross-over design participants will attend the laboratory six times, two for familiarisation sessions, and a remaining four testing session all 72 hours apart. The four testing sessions will contain two control and two intervention sessions attended in a randomised order.
Following recruitment participants will be required to complete a medical questionnaire and sign a consent form following reading the participant information sheet.
The Nordic Hamstring exercise will be performed by each participant across the intervention and control conditions. Participants will watch a video of a subject completing the Nordic exercise program. They will also receive the following verbal instructions:
'Players start in a kneeling position, with the torso from the knees upward held rigid and straight. The training partner ensures that the player's feet are in contact with the ground throughout the exercise by applying pressure to the player's heels/lower legs. The player then lowers his upper body to the ground, as slowly as possible to maximize loading in the eccentric phase. Hands and arms are used to break his forward fall and to push him back up after the chest has touched the ground, to minimize loading in the concentric phase (Mjølsne et al, 2005; Petersen et al, 2011).
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Crossover
- 主要目的
- Treatment
- 盲法
- Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
入排标准
- 年龄范围
- 18 Years 至 40 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Current Teesside University Students/Staff 18+ years Engaged in Football related activity once a week Provide Informed Consent No current musculoskeletal Injury
排除标准
- •Current symptomatic low back pain or lower limb pathology including any injuries to the lower limb/lumbar spine within the last 6 months Previous ACL/Hamstring Rupture tear or diagnosed anterior knee pain. Under supervision of another health clinician Medical questionnaire not completed Red flags on medical questionnaire Any neurological problems Contraindications or precautions to spinal mobilisation
- •malignancy, inflammatory or infectious processes involving the spine or peripheral joints,
- •osteoporosis,
- •spinal disorders including spondylolisthesis, ankylosing spondylitis, spinal fusion
结局指标
主要结局
Hamstring Peak Force
时间窗: Immediate data collection during Nordic Hamstring Exercise
Peak Force of the Hamstring as measured by the Hamstring Solo Device during a Nordic eccentric hamstring exercise The hamstring solo device calculates Force (N), time of exercise (secs), Torque (Nm) and Torque per kg. This is collected in real-time. The hamstring solo calculates the eccentric force of the hamstring in real time. Participants are placed on the board with their ankle strapped. They follow previously discussed instructions to eccentrically lower themselves to the ground from a kneeling position.
sEMG of Biceps Femoris
时间窗: Immediate data collection during Nordic Hamstring Exercise
Record electromyography (SEMG) activity in the muscles of the participants in this study the Zerowire Cometa system will be used. Every electrode unit is equipped with a small unit for signal processing and transmission to the data receiver. The electrodes are single use disposable, self-adhesive silver chloride dual snap on electrodes pre-set at a distance of 20mm. All participants will have the skin prepared prior to the noraxon electrode being placed on their skin. Electrodes will be attached according to European recommendation (seniam) to the Biceps Femoris of both limbs. The electrode placement and sEMG recording will be taken by a qualified laboratory technician employed by Teesside University.
Vicon 3D Motion Capture
时间窗: Immediate data collection during Nordic Hamstring Exercise
Participants will have their mass (kg), height (cm), knee joint (between the medial and lateral epicondyle), ankle joint width (malleoli) and leg length (ASIS to medial malleolus) measured prior to recording.Widths will be measured using anthropometric calipers. Stretch height will be performed to improve the accuracy of the measurement. Six wall-mounted Vicon MX13 infrared cameras (Vicon) will collect 3D motion capture data at a sampling frequency of 100 Hz.. 3D motion capture data will be processed via Vicon Nexus version 1.8.5 using inbuilt pipeline functions to calculate 3D kinematic data (hip,pelvis, knee). Participants will have retroflective markers (14 mm) attached to the following landmarks on both the right and left side of the body; ASIS, PSIS, greater trochanter, mid-thigh, lateral epicondyle (of the knee), mid-tibia, lateral malleolus, calcaneus, and 2nd toe. The markers will be affixed with double-sided tape placed on the overlaying skin of the bony landmark.
次要结局
- Subjective Likert Scale(Immediate post Nordic hamstring Exercise)
研究者
Paul Chesterton
Senior Lecturer Sport and Exercise
Teesside University