Latissimus Dorsi Activity During Different Exercises

NCT07297771 | Recruiting

• 1 other identifier: LDORSI-EMG
• Study Type: observational
• Target: 30
• Locations: 1 country
• Sites: 1

Brief Summary

This single-visit, laboratory study will quantify latissimus dorsi activation during standardized band/body-weight exercises commonly used in rehabilitation (e.g., standing bent-over row, inferior glide, seated press-up, body-lifting). Healthy, physically active adults (18-40 y; Tegner ≥5) will perform three repetitions per exercise with metronome-paced phases (≈3 s concentric, 3 s isometric, 3 s eccentric), 5-s rest between repetitions and 2-min between exercises; load will be individualized to reach OMNI RPE 6-8. Surface EMG (TeleMyo DTS; Noraxon) will be recorded from the latissimus dorsi (medial and lateral) and selected synergists (teres major, infraspinatus, posterior deltoid, triceps); electrode placement will follow SENIAM recommendations. Signals will be band-pass filtered (20-500 Hz), rectified, RMS-smoothed with a 100-ms window, and normalized to %MVIC using standardized MVC tests; exercise/MVC order will be randomized to limit bias. The primary outcome is mean normalized EMG amplitude per exercise; secondary outcomes include peak amplitude and categorical activation levels (low ≤20% MVIC, moderate 21-40%, high 41-60%, very high \>60%). The study involves minimal risk (possible mild skin irritation under electrodes and transient post-exercise fatigue).

Conditions

Muscle Activation

Keywords

Latissimus Dorsi; Shoulder; Electromyography

Outcome Measures

Primary Outcomes (1)

• Electromyography

  Surface EMG from the latissimus dorsi (medial and lateral sites) will be recorded with an 8-channel system (TeleMyo DTS; Noraxon). Skin will be shaved and cleaned with 70% isopropyl alcohol; bipolar Ag/AgCl electrodes will be placed per SENIAM with a 2 cm inter-electrode distance (MLD \~lateral to T9; LLD \~4 cm inferior to the scapular inferior angle, midway between the spine and lateral trunk). A synchronized video (Logitech C920) will mark movement onset/offset and will be deleted after analysis (no copies kept). Signals will be normalized to %MVIC using three 5-s MVIC trials (30-s rest between trials; \~2-min between muscles) performed in standardized positions with verbal encouragement. The outcome is the mean %MVIC during the steady phase of each exercise.

  Baseline (Day 1)

Secondary Outcomes (2)

• Electromyography-Other muscles

  Baseline (Day 1)

• Activity Level

  Baseline (Day 1)

Study Arms (1)

Healthy adults

Single-visit laboratory cohort. Physically active adults perform exercises; surface EMG is recorded from the latissimus dorsi

Behavioral: Exercise

Interventions

Exercise BEHAVIORAL

Participants will perform six standardized pulling tasks-inferior glide, low row, seated row, bent-over row, seated press-up, and body lifting-using a resistance band or body weight. Each exercise is done for 3 repetitions with \~5 s between reps and \~2 min between exercises. Resisted exercises follow a metronome-paced 3 s concentric / 3 s isometric / 3 s eccentric tempo; purely isometric tasks are held for 3 s. Load is individualized with the OMNI 0-10 scale and increased during up to 10 familiarization reps until perceived exertion reaches 6-8/10. Exercise order is randomized to minimize ordering effects.

Healthy adults

Eligibility Criteria

• Age: 18 Years - 40 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64)
• Sampling Method: Non-Probability Sample

Study Population

Healthy, physically active adults aged 18-40 years. Eligibility requires Tegner ≥5, full glenohumeral range of motion, no shoulder/cervical/lumbar complaints in the past 6 months, and no systemic or neurological disease.

You may qualify if:

• Age 18-40 years
• No range-of-motion restriction at the glenohumeral joint
• No shoulder, cervical, or lumbar region complaints/injury within the past 6 months
• No systemic or neurological disease
• Competent to consent and provides written informed consent
• Tegner Activity Scale ≥ 5

You may not qualify if:

• Body mass index (BMI) \> 25 kg/m²

Sponsors & Collaborators

• Hacettepe University: lead

Study Sites (1)

Hacettepe University

Ankara, Altındag, 06100, Turkey (Türkiye)

RECRUITING

MeSH Terms

Interventions

Exercise

Intervention Hierarchy (Ancestors)

Motor Activity; Movement; Musculoskeletal Physiological Phenomena; Musculoskeletal and Neural Physiological Phenomena

Study Design

• Study Type: observational
• Observational Model: OTHER
• Time Perspective: CROSS SECTIONAL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Professor, Department of Physiotherapy and Rehabilitation

Study Record Dates

• First Submitted: December 9, 2025
• First Posted: December 22, 2025
• Study Start: October 12, 2025
• Primary Completion: February 25, 2026
• Study Completion: February 25, 2026
• Last Updated: December 29, 2025

Record last verified: 2025-12

Data Sharing

• IPD Sharing: Will not share

Locations

TU (1)