Muscle Fatigue and Scapular Sensorimotor System

• ClinicalTrials.gov Identifier: NCT03066102
• Recruitment Status: Completed
• First Posted: February 28, 2017
• Results First Posted: July 15, 2019
• Last Update Posted: July 29, 2019
• Sponsor: National Yang Ming University
• Information provided by (Responsible Party): Yi-Fen Shih, National Yang Ming University

Study Description

Brief Summary:

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.

Condition or disease	Intervention/treatment	Phase
Muscle; Fatigue	Other: muscle fatigue	Not Applicable

Study Design

• Study Type: Interventional (Clinical Trial)
• Actual Enrollment: 30 participants
• Allocation: N/A
• Intervention Model: Single Group Assignment
• Masking: None (Open Label)
• Primary Purpose: Other
• Official Title: Muscle Fatigue and Scapular Sensorimotor System
• Actual Study Start Date: July 1, 2017
• Actual Primary Completion Date: August 11, 2017
• Actual Study Completion Date: March 27, 2018

Arms and Interventions

Intervention Details:

• Other: muscle fatigue

  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.

Outcome Measures

Primary Outcome Measures :

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 Outcome Measures :

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.

Eligibility Criteria

• Ages Eligible for Study: 20 Years to 40 Years (Adult)
• Sexes Eligible for Study: All
• Accepts Healthy Volunteers: Yes

Criteria

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

Contacts and Locations

Locations

Taiwan

National Yang Ming University

Taipei, Taiwan, 11221

Sponsors and Collaborators

National Yang Ming University

  Study Documents (Full-Text)

Documents provided by Yi-Fen Shih, National Yang Ming University:

Study Protocol and Statistical Analysis Plan  [PDF] March 27, 2018

More Information

• Responsible Party: Yi-Fen Shih, Associate Professor, National Yang Ming University
• ClinicalTrials.gov Identifier: NCT03066102
• Other Study ID Numbers: YM105067E
• First Posted: February 28, 2017
• Results First Posted: July 15, 2019
• Last Update Posted: July 29, 2019
• Last Verified: July 2019

Individual Participant Data (IPD) Sharing Statement:

• Plan to Share IPD: Undecided

• Studies a U.S. FDA-regulated Drug Product: No
• Studies a U.S. FDA-regulated Device Product: No

Keywords provided by Yi-Fen Shih, National Yang Ming University:

sensorimotor system; scapular joint position sense; fatigue

Additional relevant MeSH terms:

Fatigue