Actively Recruiting
Effects of Contralateral Eccentric and Concentric Resistance Training During Immobilization on Neuromuscular Function, Functional Recovery, and Quality of Life in Patients With Acromioclavicular Joint Injury: A Randomized Controlled Trial
Led by Universidad Nacional Andres Bello · Updated on 2026-06-08
16
Participants Needed
1
Research Sites
N/A
Total Duration
On this page
AI-Summary
What this Trial Is About
This research aims to compare the effects of two types of contralateral resistance training—eccentric and concentric—performed during the immobilization period after an acute acromioclavicular joint injury. Immobilization with a sling is common but can cause loss of muscle strength, neuromuscular function, and upper-limb ability. The study seeks to find which training method better preserves these functions and supports recovery in patients needing temporary upper-limb immobilization. Participants will be randomly assigned to either a supervised contralateral eccentric or concentric resistance training group using their non-injured upper limb during the 2 to 4 weeks of sling immobilization. Training involves three sessions per week, with 5 sets of 8-12 repetitions at 60-90% of one-repetition maximum, each contraction lasting 4 seconds and rest intervals of 3 minutes. After immobilization, all participants will follow the same standardized 4-week rehabilitation program focused on restoring shoulder stability and function. Throughout the study, participants will undergo assessments before immobilization, immediately after immobilization, and following rehabilitation. These include tests of neuromuscular function using nerve stimulation and muscle activity measurements, ultrasound imaging of muscle morphology, and clinical questionnaires evaluating upper-limb function and quality of life. The main outcomes measured will be maximal voluntary isometric contraction and rate of force development. This timeline covers approximately 6 to 8 weeks of study participation, allowing researchers to evaluate functional recovery and quality of life changes.
CONDITIONS
Brief Title
Contralateral Resistance Training During Immobilization in Patients With Acromioclavicular Joint Injury
Who Can Participate
Eligibility Criteria
You may qualify if you...
- Men and women aged 18 to 36 years
- Diagnosis of acute acromioclavicular joint injury confirmed by an orthopedic surgeon
- Physician-prescribed upper-limb immobilization using a sling for approximately 2 to 4 weeks, with or without surgical repair
- Ability to understand study procedures and provide written informed consent
- Medical clearance to participate in the rehabilitation and resistance training program
You will not qualify if you...
- Previous surgery or severe musculoskeletal injury affecting either upper limb within the previous 12 months
- Neurological disorders affecting motor function or neuromuscular performance
- Contraindications to transcranial magnetic stimulation according to established safety guidelines
- Current participation in another clinical trial or structured upper-limb rehabilitation program
- Cognitive impairment or inability to comply with study procedures
- Pregnancy
- Any medical condition that may compromise participant safety or study participation
AI-Screening
AI-Powered Screening
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Your Study Journey
Duration - 2 to 4 weeks
Participants are screened for eligibility to participate in the trial.
1 visit (in-person)
Duration - 2 to 4 weeks
Participants perform supervised contralateral eccentric or concentric resistance training with the non-injured upper limb during the period of physician-prescribed sling immobilization following acute acromioclavicular joint injury.
3 supervised training sessions per week during immobilization
Duration - 4 weeks
Following immobilization, participants complete a standardized 4-week rehabilitation program focused on restoring shoulder stability, muscle strength, and functional capacity.
Scheduled rehabilitation visits over 4 weeks
Trial Site Locations
Total: 1 location
1
Clínica Indisa
Santiago, Providencia, Chile
Actively Recruiting
Research Team
O
Omar E Valdés Tapia, PT, MSc, PhD(c)
How is the study designed?
Study Type
INTERVENTIONAL
Masking
SINGLE
Allocation
RANDOMIZED
Model
PARALLEL
Primary Purpose
TREATMENT
Number of Arms
2
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