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Latissimus Dorsi Activation During Shoulder Extension Exercises
Sponsor: Hacettepe University
Summary
This observational, cross-sectional laboratory study at Hacettepe University will examine surface EMG activation of the latissimus dorsi during resisted, dynamic shoulder extension performed at three shoulder flexion angles (30°,60°, 90°, 120°). The primary objective is to quantify latissimus dorsi activation and to determine how elevation angle influences activation; secondary analyses compare synergists.
Official title: Investigation of Latissimus Dorsi Muscle Activation During Shoulder Extension Exercises
Key Details
Gender
All
Age Range
18 Years - 40 Years
Study Type
OBSERVATIONAL
Enrollment
31
Start Date
2025-10-14
Completion Date
2026-04-01
Last Updated
2026-10-26
Healthy Volunteers
Yes
Conditions
Interventions
Exercise
Standing with the shoulder in \~30° abduction and neutral rotation and the elbow extended, participants elevate the arm to three preset flexion angles (30°,60°, 90°, 120°; measured by goniometer) and then perform shoulder extension past the trunk against color-coded elastic bands. Bands are anchored overhead and pulled diagonally downward; the band angle is adjusted to match each shoulder-flexion condition. Within each angle condition, the band and grip length were kept constant across the three repetitions, and participants maintained the marked starting hand position at a horizontal distance of 120 cm from the band anchor. Resistance is individualized using the OMNI Perceived Exertion Scale and titrated until 6-8/10 is reached prior to data capture. Each condition is recorded for 3 repetitions with \~5 s between reps; \~2 min rest is provided between conditions. A brief familiarization (\~3 min per condition) is given, and the order of MVICs and exercise conditions is randomized.
Locations (1)
Hacettepe University
Ankara, Samandag, Turkey (Türkiye)