Selective Activation of the Infraspinatus During External Rotation Exercises in Participants With Rounded Shoulder Posture

Selective Activation of the Infraspinatus During External Rotation Exercises in Participants With Rounded Shoulder Posture: Comparison of 3 Common Exercises and Muscle Architecture-Based Exercise

Status

Completed

Phases

Unknown

Study type

Observational

Source

ClinicalTrials.gov

Registry ID

NCT06070909

Enrollment

Registered

2023-10-06

Start date

2023-07-15

Completion date

2023-07-30

Last updated

2023-10-06

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Shoulder Disease

Keywords

Infraspinatus, Muscle architecture, Rounded Shoulder Posture, Superficial EMG

Brief summary

The purpose of this prospective, cross-sectional study was to evaluate the selective activation of the infraspinatus during external rotation exercises in participants with rounded shoulder postures and compare the different exercise positions. The fifteen (7 males and 8 females) participants with rounded shoulder posture were recruited for this study. The EMG activations of the middle trapezius, posterior deltoid and infraspinatus muscles in the dominant limb were recorded during exercises in standing external rotation (SER), side-lying position (SDER), scapular plane (SPER) and muscle architecture-based (MABER) positions.

Interventions

DEVICEThe EMG activations

The EMG activations of the middle trapezius, posterior deltoid and infraspinatus muscles in the dominant limb were recorded during exercises in standing external rotation (SER), side-lying position (SDER), scapular plane (SPER) and muscle architecture-based (MABER) positions

Study design

Observational model

COHORT

Time perspective

CROSS_SECTIONAL

Eligibility

Sex/Gender

ALL

Age

18 Years to 30 Years

Healthy volunteers

Yes

Inclusion criteria

* without shoulder pain, * totally able to perform overhead activities with no pain or discomfort, * without a history of shoulder injuries * with rounded shoulder posture

Exclusion criteria

* a history of shoulder muscle injury * bone fractures in shoulder region * luxation or subluxation * cervical dysfunction radiating to upper limbs * neurologic or musculoskeletal disorders that would prevent shoulder external rotation in the testing postures.

Design outcomes

Primary

Measure	Time frame	Description
The EMG activations of the middle trapezius, posterior deltoid and infraspinatus muscles in the dominant limb	4 weeks	The EMG activations of the middle trapezius, posterior deltoid and infraspinatus muscles in the dominant limb were recorded during exercises in standing external rotation (SER), side-lying position (SDER), scapular plane (SPER) and muscle architecture-based (MABER) positions

Countries

Turkey (Türkiye)

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026