Is There an Immediate Effect on Pectoralis Minor Length After Performing a Prone Scapular Retraction Exercise

Is There an Immediate Effect on Pectoralis Minor Length After Performing a Prone Scapular Retraction Exercise Using Typical Sets and Repetitions in Pain Free Participants

The goal of this clinical trial is to test normal participants.

The main question it aims to answer is:

• Do the participant's pectoralis minor muscles change length immediately after performing an exercise that recruits the scapular retractor muscles? Participants will have their pectoralis minor muscle measured, then perform an exercise recruiting the scapular retractor muscles, and then have their pectoralis muscle measured again.

Study Overview

• Status: Completed
• Conditions: Pectoralis Minor Length
• Intervention / Treatment: Other: Scapular retraction exercise

Detailed Description

The participants will have their standing height measured in centimeters with a tape measure fixed against a wall. Participants will then step away from the wall and will be asked to stand in their normal resting position. A mark will be placed on the most medial-inferior aspect of the coracoid process and a second mark on the anterior-inferior edge of the third rib, one index finger's width lateral to the sternum. A caliper will then be used to measure the distance between these marks as the participant holds a normal exhalation.

Participants will then lay prone on a treatment plinth with a small towel roll under their forehead. The participants will form both fists and place them on the plinth just superior to their head, with bilateral thumbs up and the ulnar side of the hands resting on the plinth, and their arms relaxed so their elbows remain on the plinth. The participants will then lift their elbows off the plinth as high as possible while keeping their hands on the plinth. The participants will repeat this motion for 10 repetitions, performing three sets of this exercise with 30 seconds of rest in between each set.

After the third set, the participants will stand up and a second caliper will be used to once again measure PM length by the same tester using the same marks. This will conclude the testing procedure and the participant's involvement in the study.

• Study Type: Interventional
• Enrollment (Actual): 50
• Phase: Not Applicable

Contacts and Locations

Study Locations

• United States
  • Idaho
    • Hayden, Idaho, United States, 83835
      • North Idaho Physical Therapy

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

• 18 years of age or older. At least 130 degrees of shoulder elevation. None of the exclusion criteria.

Exclusion Criteria:

• Current shoulder pathology and or pain, prior shoulder surgery, any neurological impairment, any upper quarter deformity, a fracture of the upper extremity, or systemic inflammatory disease.

Study Plan

How is the study designed?

Design Details

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

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Intervention arm; Participants who underwent intervention.	Other: Scapular retraction exercise; Participant lies prone with hands superior to the head on a treatment plinth and lifts their elbows 10 repetitions for three sets with 30 seconds of rest between each set.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Pectoralis Minor Length	Length of the Pectoralis Muscle length in millimeters	Measured before and immediately after intervention

Collaborators and Investigators

• Sponsor: Andrews University
• Investigators: Principal Investigator: Jeremy Dye, MPT, North Idaho Physical Therapy

Publications and helpful links

General Publications

• Borstad JD. Measurement of pectoralis minor muscle length: validation and clinical application. J Orthop Sports Phys Ther. 2008 Apr;38(4):169-74. doi: 10.2519/jospt.2008.2723. Epub 2007 Nov 21.
• Viriyatharakij N, Chinkulprasert C, Rakthim N, Patumrat J, Ketruang B. Change of pectoralis minor length, and acromial distance, during scapular retraction at 60 degrees shoulder elevation. J Bodyw Mov Ther. 2017 Jan;21(1):53-57. doi: 10.1016/j.jbmt.2016.04.015. Epub 2016 Apr 29.

Study record dates

Study Major Dates

• Study Start (Actual): July 15, 2021
• Primary Completion (Actual): January 10, 2022
• Study Completion (Actual): January 10, 2022

Study Registration Dates

• First Submitted: February 28, 2024
• First Submitted That Met QC Criteria: April 2, 2024
• First Posted (Actual): April 4, 2024

Study Record Updates

• Last Update Posted (Actual): April 4, 2024
• Last Update Submitted That Met QC Criteria: April 2, 2024
• Last Verified: November 1, 2023

More Information

Terms related to this study

• Keywords: Reciprocal Inhibition; Pectoralis Minor
• Other Study ID Numbers: 12241976

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

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