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.

Study Overview

• Status: Completed
• Conditions: Muscle; Fatigue
• Intervention / Treatment: Other: muscle fatigue

• Study Type: Interventional
• Enrollment (Actual): 30
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Taiwan
  • Taipei, Taiwan, 11221
    • National Yang Ming University

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 38 years (Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

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

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Other
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change From Baseline in Scapular Proprioception	Test the ability of active re-position the scapula from neutral to 90% range of protraction, and elevation.	through fatigue intervention completion, an average of 20 minutes in female subjects and 40 minutes in male subjects
Change From Baseline in Muscle Activation During Scapular Proprioception	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.	through fatigue intervention completion, an average of 20 minutes in female subjects and 40 minutes in male subjects

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change From Baseline in Scapular Muscle Strength	use dynamometer to detect the force of maximum isometric voluntary contraction of upper trapezius, lower trapezius and serratus anterior	through fatigue intervention completion, an average of 20 minutes in female subjects and 40 minutes in male subjects
Change From Baseline in Shoulder Kinematics Data During Shoulder Elevation in the Scapular Plane	use Liberty to detect the motion of spine, humerus, and scapula during shoulder elevation in the scapular plane (scaption)	through fatigue intervention completion, an average of 20 minutes in female subjects and 40 minutes in male subjects
Change From Baseline in Scapular Muscle Activity During Shoulder Elevation in the Scapular Plane	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.	through fatigue intervention completion, an average of 20 minutes in female subjects and 40 minutes in male subjects
Change From Baseline in Scapular Muscle Recruitment Timing During Arm Elevation in Scapular Plane	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.	through fatigue intervention completion, an average of 20 minutes in female subjects and 40 minutes in male subjects

Collaborators and Investigators

• Sponsor: National Yang Ming University

Study record dates

Study Major Dates

• Study Start (Actual): July 1, 2017
• Primary Completion (Actual): August 11, 2017
• Study Completion (Actual): March 27, 2018

Study Registration Dates

• First Submitted: February 16, 2017
• First Submitted That Met QC Criteria: February 27, 2017
• First Posted (Actual): February 28, 2017

Study Record Updates

• Last Update Posted (Actual): July 29, 2019
• Last Update Submitted That Met QC Criteria: July 15, 2019
• Last Verified: July 1, 2019

More Information

Terms related to this study

• Keywords: fatigue; sensorimotor system; scapular joint position sense
• Additional Relevant MeSH Terms: Fatigue
• Other Study ID Numbers: YM105067E

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: Undecided

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No