Tendinopathy
Conditions
Keywords
Exercise, Physical Activity, Biomechanics
Brief summary
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.
Interventions
OTHERIsometric Exercise
5 sets of 45-seconds quadriceps contraction, each followed by 2-minutes of rest.
5 sets of 45-seconds intervals without quadriceps contraction, each followed by 2-minutes of rest.
Sponsors
Foundation for Physical Therapy, Inc.
University of North Carolina, Chapel Hill
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
TREATMENT
Masking
DOUBLE (Subject, Investigator)
Masking description
Participants are masked to their group assignment until the end of the study. Investigator is masked to intervention condition.
Eligibility
Sex/Gender
MALE
Age
15 Years to 28 Years
Healthy volunteers
Yes
Inclusion criteria
The investigators will recruit a convenience sample of participants who meet the following overall criteria: 1. Age 15 and post-pubertal (confirmed by Pubertal Development Scale Questionnaire) - 28 years 2. 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.
Exclusion criteria
The following
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Difference in the change in mean peak patellar tendon force during landing between groups | 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 internal hip flexion moment during landing between groups | 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 vertical ground reaction force during landing between groups | 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 | 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. |
| Difference in the change in mean internal knee extension moment during landing between groups | 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. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Difference in average minutes of moderate-to-vigorous physical activity (MVPA) between groups | Day 1 - Day 7 | MVPA calculated by an ActiGraph GT9X Link Accelerometer (ActiGraph Corporation, Pensacola, FL) wearable physical activity device worn at the hip using a belt clip. |
| Difference in change in anterior knee pain (self-reported via visual analog scale (0-10)) between groups | Pre- and post-intervention condition (~10 minutes) | A standard visual analog scale (0-10) will be utilized to assess pain, where 0=complete absence of pain and 10=worst pain imaginable (higher scores indicate worse pain). This scale will be delivered verbally and the participants will respond verbally. |
| Difference in average steps-per-day between groups | Day 1 - Day 7 | Steps-per-day calculated by an ActiGraph GT9X Link Accelerometer (ActiGraph Corporation, Pensacola, FL) wearable physical activity device worn at the hip using a belt clip. |
Countries
United States
Outcome results
None listed