Changes in Shoulder Muscle Activation According to the Methods of Carrying Backpacks

CHA University

Status

Unknown

Conditions

Shoulder Muscle Activation

Surface Emg

Treatments

Diagnostic Test: surface EMG

Study type

Interventional

Funder types

Other

Identifiers

NCT04879901

BundangCHA

Details and patient eligibility

About

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

Full 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.

Enrollment

30 estimated patients

Sex

All

Ages

20 to 59 years old

Volunteers

Accepts Healthy Volunteers

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