Changes in Muscle Activation When Carrying Backpacks

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

WITHDRAWN

Clinical Phase

NA

Study Classification

INTERVENTIONAL

Study Start Date

2021-05-03

Study Completion Date

2021-05-28

Brief Summary

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

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Detailed Description

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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.

Conditions

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Shoulder Muscle Activation Surface Emg

Study Design

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Allocation Method

NA

Intervention Model

SINGLE_GROUP

Primary Study Purpose

DIAGNOSTIC

Blinding Strategy

NONE

Study Groups

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Experimental group

Group measuring shoulder muscle activities by surface EMG with carrying backpacks forward

Group Type EXPERIMENTAL

surface EMG

Intervention Type DIAGNOSTIC_TEST

Carrying backpacks forward or backward

Interventions

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surface EMG

Carrying backpacks forward or backward

Intervention Type DIAGNOSTIC_TEST

Eligibility Criteria

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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

Minimum Eligible Age

20 Years

Maximum Eligible Age

59 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes