Patellar Tendinopathy
Conditions
Keywords
eccentric squatting, electromyografic activation, exercise, patellar tendinopathy
Brief summary
Previous studies have generally investigated patellar tendon stiffness, cross-sectional area of patellar tendon, patellar tendon length, patellar force and patellafemoral forces during decline squat. However, there is just a few study about electromyographic (EMG) activity during the eccentric squating, which is about rectus femoris (RF) recruitment. In the present study the investigators primarly aimed to quantify the activation of RF, vastus lateralis (VL), and vastus medialis obliqus (VMO) during eccentric squat on different decline angle (0, 5°, 10°, 15°, 20°). An additional purpose of our study was to compare the changes in muscle activation at various arc of knee flexion motion (degrees of 0-30, 30-60, 60-90, 0-60, 30-90, 0-90).The investigators hypothesised that the recruitment of RF, VL, and VMO during eccentric squat would differ according to decline angle and arc of motion.
Detailed description
The squat procedure in each condition will be repeated 10 times on a treadmill. The treadmill will be used to adjust the degree of decline in a standard manner. There will be a metronome to keep the speed of exercise in the same rhythm. All squats will be performed with a weighted barbell. The weight of it will be set as in ratio 30% of the participant's body weight
Interventions
None listed
Sponsors
Ordu University
Study design
Observational model
CASE_CROSSOVER
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
* had exercised regularly (\>3 days in a week) for at least six months. * older than 18 years old.
Exclusion criteria
* had patellofemoral pain, knee pain otherwise unrelated to the knee extensor mechanism and other injuries that would restrict performance of the tasks (e.g. ankle pathology).
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Electromyographic measurement of muscle activation | 50 minutes | Surface electromyographic (EMG) system (Noraxon Telemyo DTS System, Scottsdale, USA) will be use to measure the muscle activation ratios of RF, VL, and VMO. Electrodes will be placed according to Surface EMG for noninvasive assessment of muscles (SENIAM) recommendations on the dominant leg. The muscle activation during eccentric phase of the decline squat for RF, VL, and VMO will be determined. The decline squat will be performed under different conditions (various decline angle: 0, 5, 10,15, 20 degree) The muscle activation will also be investigated within various arc of motion of knee flexion (0-30, 30-60, 60-90, 0-60, 0-90, 30-90) which is determined using the motion analysis system (Noraxon, MYOmotion Scottsdale, USA). |
| Maximal voluntary isometric contractions (MVICs) | 5 minutes | MVICs for the RF, VL, and VMO at their manual muscle test positions will be assessed within 3 trials, which lasts 5 seconds. The muscle test position will be standardized 90 degrees hip flexion and 60 degrees knee flexion. One minute a rest period will be between each trial. The peak EMG amplitude will be used for the normalization. |
| Normalized EMG values | 5 minutes | The amount of muscle activation in each condition will be proportioned to MVICs value for normalization using a calculator. The value will be represented in percentile (%). |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Weight | 1 minute | The participant's weight will be determined a weighing machine inkilogram. |
| Height | 1 minute | The participant's height will be measured in cm. |
Countries
Turkey (Türkiye)
Contacts
Primary ContactSevim Acaröz Candan, PhD
Outcome results
None listed