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Completed

NCT Number: NCT03066102

Muscle Fatigue and Scapular Sensorimotor System

The aims of this study are to investigate the effects of scapular muscle fatigue on scapular joint position sense and neuromuscular performance (scapular muscle strength, the kinematics data and muscle activity of shoulder during scaption (arm elevation in the scapular plane)). The investigators hypothesize that scapular muscle fatigue would increase scapular reposition error and affect neuromuscular performance of the scapular during scaption.

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Key information

Conditions

Muscle; Fatigue Fatigue Pathological Conditions, Signs and Symptoms Signs and Symptoms

Age range

20 year–40 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

National Yang Ming University

Taipei, 11221, Taiwan

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • no shoulder, cervical, and thoracic spine pain within six months
  • negative for subacromial impingement test
  • normal range of motion of glenohumeral joint

Exclusion criteria

  • history of dislocation, fracture, or surgery of shoulder joint
  • history of central nervous system disorder, rheumatoid arthritis, shoulder osteoarthritis, or cervical radiculopathy

Treatment and study plan

muscle fatigue

Other

Modified push-up plus exercise:

the participants first supported by both knees and the single elbow, and then performed sustained scapular protraction for three minutes with ten repetitions in males and two minutes with five repetitions in females with forty-five seconds rest between.

Primary outcomes

  1. Change From Baseline in Scapular Proprioception

    Time frame: through fatigue intervention completion, an average of 20 minutes in female subjects and 40 minutes in male subjects

    Test the ability of active re-position the scapula from neutral to 90% range of protraction, and elevation.

  2. Change From Baseline in Muscle Activation During Scapular Proprioception

    Time frame: through fatigue intervention completion, an average of 20 minutes in female subjects and 40 minutes in male subjects

    Test the ability of muscle activation (upper trapezius, lower trapezius, and serratus anterior) during active re-position the scapula from neutral to 90% range of protraction, and elevation.

    Muscle activation during active re-position would divide into muscle activation during maximum voluntary isometric contraction (MVIC), present in percent.

Secondary outcomes

  1. Change From Baseline in Scapular Muscle Strength

    Time frame: through fatigue intervention completion, an average of 20 minutes in female subjects and 40 minutes in male subjects

    use dynamometer to detect the force of maximum isometric voluntary contraction of upper trapezius, lower trapezius and serratus anterior

  2. Change From Baseline in Shoulder Kinematics Data During Shoulder Elevation in the Scapular Plane

    Time frame: through fatigue intervention completion, an average of 20 minutes in female subjects and 40 minutes in male subjects

    use Liberty to detect the motion of spine, humerus, and scapula during shoulder elevation in the scapular plane (scaption)

  3. Change From Baseline in Scapular Muscle Activity During Shoulder Elevation in the Scapular Plane

    Time frame: through fatigue intervention completion, an average of 20 minutes in female subjects and 40 minutes in male subjects

    Test the ability of muscle activity (upper trapezius, lower trapezius, and serratus anterior) during shoulder elevation in the scapular plane (scaption).

    Muscle activation during scaption would divide into muscle activation during maximum voluntary isometric contraction (MVIC), present in percent.

  4. Change From Baseline in Scapular Muscle Recruitment Timing During Arm Elevation in Scapular Plane

    Time frame: through fatigue intervention completion, an average of 20 minutes in female subjects and 40 minutes in male subjects

    Test the ability of muscle onset timing (upper trapezius, lower trapezius, and serratus anterior) during shoulder elevation in the scapular plane (scaption).

    Onset timing was determined by EMG signals bigger than resting signals plus 3 times standard deviations.

    Origin was set at onset of kinematics data of glenohumeral joint.

Sponsors and collaborators

Lead sponsor

National Yang Ming Chiao Tung University

Other

Registry information

Important dates

Study start
2017
Primary completion
2017
Study completion
2018
First posted
Feb 28, 2017
Registry last updated
Jul 29, 2019

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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