The Acute Effects of an Isometric Loading Intervention on Lower Extremity Landing Biomechanics in Individuals With Patellar Tendinopathy
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 43
- 试验地点
- 2
- 主要终点
- Difference in the change in mean internal knee extension moment during landing between groups
研究概览
简要总结
The purpose of this study is to determine differences in lower extremity landing biomechanics and real-world physical activity between individuals with patellar tendinopathy compared to individuals without patellar tendinopathy,and to determine the acute effects of an isometric loading intervention on lower extremity landing biomechanics in individuals with patellar tendinopathy.
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
- Double (Participant, Investigator)
盲法说明
Participants are masked to their group assignment until the end of the study. Investigator is masked to intervention condition.
入排标准
- 年龄范围
- 15 Years 至 28 Years（Child, Adult）
- 性别
- Male
- 接受健康志愿者
- 是
入选标准
- •The investigators will recruit a convenience sample of participants who meet the following overall criteria:
- •Age 15 and post-pubertal (confirmed by Pubertal Development Scale Questionnaire) - 28 years
- •Actively participating within an organized sport setting (high school, collegiate, club, competitive intramural sports) in their respective team's weekly training and competitions, quantified by a Tegner Activity Level Scale of at least 5.
排除标准
- •The following exclusion criteria will be applied to all participants:
- •Any anterior knee pain with no patellar tendon abnormality on ultrasound assessment.
- •History of any knee joint surgery ever.
- •History of other (non-knee) lower extremity surgery in the last 1 year.
- •History of lower extremity injury in last 6 months (other than patellar tendinopathy).
- •An injection (corticosteroids, plasma-rich-protein, etc.) to the patellar tendon in the last 3 months.
- •Known history of osteoarthritis or current symptoms related to osteoarthritis (i.e. stiffness, swelling).
- •Participation in formal rehabilitation for patellar tendinopathy in prior 3 months
- •Known neurological disorders, including: stroke, multiple sclerosis, ALS, diabetic neuropathy, epilepsy, traumatic brain injury resulting in loss of consciousness, concussion within the last 6 months, cranial neural surgery, balance disorders.
- •Use of pacemaker or another implantable electronic device.
- •History of cardiac arrhythmia or any cardiac condition.
- •History of psychiatric disorder. *
- •History of cancer in the brain or thigh musculature.
- •Pubertal Development Scale Score < 12 (Stages 1-4)
- •Note: Rationale for exclusion of individuals with a history of psychiatric disorders is that these individuals may have taken or be taking pharmacological agents that could affect pain or neuromuscular control.
研究组 & 干预措施
Isometric Exercise Condition
The participant will perform 5 sets of a 45-second isometric contractions at 70% of their maximum voluntary isometric contraction (MVIC). During the 45-second contraction, the participant will be provided with visual biofeedback on a computer screen (70% MVIC target line and +/- 5% error lines). The participant will be instructed to produce a level of isometric quadriceps contraction that maintains the isometric torque output line as close the target line as possible and always between the two error lines.
干预措施: Isometric Exercise (Other)
Sham TENS Condition
Two electrodes of the Select System TENS unit (Empi, Inc., St. Paul, MN) will be placed on either side of the patellar tendon on the test limb. The same instruction script will be used for each participant, stating, "A surface electrode has been placed on either side of your patellar tendon. I will turn on the stimulation unit to emit a stimulus to your patellar tendon. This is a special sub-sensory stimulation treatment, so you will not feel anything during this period as the stimulus is set at a very low, non-detectable threshold. Please remain still during this 45-second period, letting your leg rest passively in the machine without contracting your leg muscles. After the 45-second period, the stimulation unit will be turned off and you will have a 2-minute rest period. We will repeat this same treatment/rest sequence 5 total times."
干预措施: Sham Transcutaneous Electrical Nerve Stimulation (Other)
结局指标
主要结局
Difference in the change in mean internal knee extension moment during landing between groups
时间窗: Pre- and post-intervention condition (~30 minutes)
Angular force or moment will be measured in Nm/kg\*m where "Nm" represents angular force and "kg\*m" represents normalization to body weight and height.
Difference in the change in mean internal hip flexion moment during landing between groups
时间窗: Pre- and post-intervention condition (~30 minutes)
Angular force or moment will be measured in Nm/kg\*m where "Nm" represents angular force and "kg\*m" represents normalization to body weight and height.
Difference in the change in mean peak patellar tendon force during landing between groups
时间窗: Pre- and post-intervention condition (~30 minutes)
Patellar tendon force will be measured in N(BW) where "N" is a measure of force and "BW" represents normalization to body weight.
Difference in the change in mean peak vertical ground reaction force during landing between groups
时间窗: Pre- and post-intervention condition (~30 minutes)
Vertical ground reaction force will be measured in N(BW) where "N" is a measure of force and "BW" represents normalization to body weight.
Difference in the change in mean peak vertical ground reaction force loading rate during landing between groups
时间窗: Pre- and post-intervention condition (~30 minutes)
Vertical ground reaction force loading rate will be measured in N(BW)/s where "N" is a measure of force and "BW" represents normalization to body weight and "s" is the time unit seconds.
次要结局
- Difference in average minutes of moderate-to-vigorous physical activity (MVPA) between groups(Day 1 - Day 7)
- Difference in change in anterior knee pain (self-reported via visual analog scale (0-10)) between groups(Pre- and post-intervention condition (~10 minutes))
- Difference in average steps-per-day between groups(Day 1 - Day 7)