Changes in Muscle Activation When Carrying Backpacks

Changes in Muscle Activation of Serratus Anterior, Deltoid (Anterior) and Trapezius (Upper and Lower) According to the Methods of Carrying Backpacks

To investigate change of shoulder muscles by measuring muscle activity according to the position of the backpack.

Study Overview

• Status: Withdrawn
• Conditions: Shoulder Muscle Activation; Surface Emg
• Intervention / Treatment: Diagnostic test: surface EMG

Detailed Description

Most of modern people, including students and office workers, wear backpacks for a considerable amount of time. There have been prior studies on the change in muscle activity around the spine and shoulders muscles according to the weight of the backpack, but studies on the change in muscle activity according to the direction of the bag are insufficient. So this study is to evaluate the effect on the musculoskeletal system by comparing the activity of the muscles around the shoulder according to the anterior or posterior wearing of the backpack.

Muscles around the shoulder are composed of: Serratus anterior, trapezius(upper and lower) which control scapular movement and deltoid muscles which activate shoulder abduction directly. We would like to focus change of these muscles's activities when carrying a backpack according to the anterior or posterior direction and bilateral or unilateral.

To measure muscle activity, eight-channel electromyography (EMG) Using Nicolet EDX (Natus Medical Inc., San Carolos, CA, USA), surface EMG (sEMG) signal were used.

• Study Type: Interventional
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Korea, Republic of
  • Gyeonggi-do
    • Seongnam-si, Gyeonggi-do, Korea, Republic of
      • Bundang Cha Medical Center

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 20 years to 59 years (Adult)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• Healthy adults from 20s to 50s

Exclusion Criteria:

• Restriction of joint motion range of shoulder and elbow
• Hisory of upper limb surgery in the past 6 months
• If there is an external wire such as a temporary external pacemaker or central line guide wire

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Diagnostic
• 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: Experimental group; Group measuring shoulder muscle activities by surface EMG with carrying backpacks forward	Diagnostic test: surface EMG; Carrying backpacks forward or backward

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Root mean square of each muscle activation	Quantification of muscle activity	through study completion, an average of 1 year

Collaborators and Investigators

• Sponsor: Bundang CHA Hospital
• Investigators: Study Director: Kyunghoon Min, MD, PhD, Department of Rehabilitation Medicine, CHA Bundang Medical Center, CHA University School of Medicine

Study record dates

Study Major Dates

• Study Start (Actual): May 3, 2021
• Primary Completion (Actual): May 28, 2021
• Study Completion (Actual): May 28, 2021

Study Registration Dates

• First Submitted: April 8, 2021
• First Submitted That Met QC Criteria: April 30, 2021
• First Posted (Actual): May 3, 2021

Study Record Updates

• Last Update Posted (Actual): June 1, 2021
• Last Update Submitted That Met QC Criteria: May 28, 2021
• Last Verified: May 1, 2021

More Information

Terms related to this study

• Keywords: backpack; shoulder muscle activation; surface emg; deltoid, serratus anterior, trapezius
• Other Study ID Numbers: BundangCHA

Plan for Individual participant data (IPD)

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

Drug and device information, study documents

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