Electromyographic Evaluation of Quadriceps During Eccentric Decline Squat

NCT04204460 | Unknown

• 1 other identifier: OrduU6
• Study Type: observational
• Target: 20
• Locations: 1 country
• Sites: 1

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.

Conditions

Patellar Tendinopathy

Keywords

eccentric squatting; electromyografic activation; exercise; patellar tendinopathy

Outcome Measures

Primary Outcomes (3)

• Electromyographic measurement of muscle activation

  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).

  50 minutes

• Maximal voluntary isometric contractions (MVICs)

  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.

  5 minutes

• Normalized EMG values

  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 (%).

  5 minutes

Secondary Outcomes (2)

• Weight

  1 minute

• Height

  1 minute

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)
• Sampling Method: Probability Sample

Study Population

Asymptomathic older than 18 years, voluntary subjects who are students in a high school of physical education and sports.

You may qualify if:

• had exercised regularly (\>3 days in a week) for at least six months.
• older than 18 years old.

You may not qualify if:

• 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).

Sponsors & Collaborators

• Ordu University: lead

Study Sites (1)

Sevim ACARÖZ CANDAN

Ordu, Altinordu, 52100, Turkey (Türkiye)

Location

MeSH Terms

Conditions

Motor Activity

Condition Hierarchy (Ancestors)

Behavior

Study Officials

• Sevim Acaröz Candan, PhD

  Ordu University

  PRINCIPAL INVESTIGATOR

Central Study Contacts

Sevim Acaröz Candan, PhD

CONTACT

004522265200; fzt_acaroz@hotmail.com

Study Design

• Study Type: observational
• Observational Model: CASE CROSSOVER
• Time Perspective: PROSPECTIVE
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Head of Department of Physiotherapy and Rehabilitation

Study Record Dates

• First Submitted: December 6, 2019
• First Posted: December 19, 2019
• Study Start: December 15, 2019
• Primary Completion: December 21, 2019
• Study Completion: December 22, 2019
• Last Updated: December 19, 2019

Record last verified: 2019-12

Data Sharing

• IPD Sharing: Will not share

Locations

TU (1)