Shoulder strength testing measures force production in specific shoulder positions. External rotation, internal rotation and abduction strength tests can help professionals compare sides, monitor progress and guide upper-limb programming. Results should be interpreted as position-specific strength measures, not as a complete measure of shoulder function.
A client may report reduced confidence with overhead movement, pressing, throwing, swimming or upper-limb loading. Strength testing can help quantify whether there is a measurable difference between sides or whether force output changes across a training block.
Shoulder strength testing is most useful when the setup is consistent. Test position, device placement, trial number, stabilisation, pain and compensation all influence the result. The goal is to create a repeatable measurement that can be tracked over time, not to make a diagnosis from a single score.
Test name: Shoulder Strength Testing
Tests covered: Shoulder external rotation, shoulder internal rotation and shoulder abduction strength
Purpose: Assess shoulder force production in defined positions
What it assesses: Isometric shoulder strength, side-to-side comparison, pain response and progress over time
Equipment: Handheld dynamometer, Muscle Meter or equivalent force device, Measurz for recording
Key finding: Peak force, best trial or average trial score
Best used with: Shoulder ROM tests, push-up testing, closed-chain upper-extremity testing, med ball throw and upper-body strength assessments
Key limitation: Results are position-specific and do not represent full shoulder function on their own
Shoulder strength testing uses a force-measuring device to record how much force a client can produce in a defined shoulder position. Testing may include external rotation, internal rotation and abduction.
The result is usually recorded as force, using the unit provided by the device. Each test should include the side tested, position used, number of trials, pain response and whether the recorded score is the best trial or average of trials.
Shoulder strength testing is used to establish a baseline, compare left and right sides, monitor progress and guide strength programming.
It may be useful for overhead athletes, swimmers, throwers, racquet sport athletes, gym clients, contact sport athletes and clients completing upper-limb strength programmes.
Shoulder strength testing measures isometric force production in the selected position.
It may reflect:
Shoulder rotation strength
Shoulder elevation strength
Side-to-side force differences
Pain response during resisted testing
Strength changes across sessions
Consistency of force production
It does not diagnose shoulder pathology, identify the source of pain, prove overhead readiness or measure complete shoulder function by itself.
The Shoulder External Rotation Strength Test measures force production as the client rotates the arm outward against resistance. It is commonly used alongside internal rotation strength testing to understand shoulder rotation strength.
The result is specific to the tested position. External rotation tested with the arm by the side should be recorded separately from external rotation tested in an abducted position.
The Shoulder Internal Rotation Strength Test measures force production as the client rotates the arm inward against resistance. It can be used to compare sides and to provide context alongside external rotation strength.
Internal rotation strength should be interpreted with the exact shoulder and elbow position used during testing.
The Shoulder Abduction Strength Test measures force production during resisted shoulder elevation. The test may be performed in abduction or scaption, depending on the protocol selected.
Arm angle, device placement and lever length strongly influence the result, so they must be standardised and recorded.
Shoulder strength testing may be useful for clients who need measurable upper-limb strength tracking. This includes athletes, gym clients, swimmers, throwers, racquet sport players, contact sport athletes and clients completing shoulder strength or upper-limb loading programmes.
It may not be suitable when pain prevents maximal effort, the test position cannot be standardised, the client cannot follow instructions safely or the result would not influence programming decisions.
Handheld dynamometer, Muscle Meter or equivalent force device
Chair, treatment table or standing test area
Optional towel roll if used consistently
Optional strap fixation if used consistently
Measurz for recording
Optional video review
Choose whether the session will include external rotation, internal rotation, abduction or all three. Record each test separately.
Select the shoulder position, elbow angle and body position before testing. Use the same position for both sides and for future retesting.
Place the client in the selected seated, standing or lying position. The trunk, shoulder and elbow should remain as still as possible during the test.
Position the force device at the agreed landmark. For rotation tests, this is commonly near the distal forearm. For abduction testing, this may be the distal upper arm or distal forearm depending on the chosen protocol.
Stabilise the trunk, shoulder and elbow as required. Any strap, towel roll or external fixation should be recorded and repeated during retesting.
Ask the client to gradually build force into the device and hold a maximal effort for the selected test duration. The client should avoid sudden jerking, trunk movement or compensatory movement.
Perform two to three trials per side with adequate rest between trials. Record whether the final score is the best trial or the average of trials.
Record pain, symptom location, apprehension, fatigue and any compensation that may affect interpretation.
Record force in the unit provided by the device. Also record side tested, test position, trial number and whether the score represents the best trial or average of trials.
Interpretation should include:
Absolute force
Side-to-side comparison
Pain score
Symptom location
Bodyweight-normalised force where relevant
Test position
Trial consistency
Previous baseline
Related ROM findings
Related functional test results
A lower score may indicate reduced force production under the tested setup, but it does not explain the cause. Pain, positioning, apprehension, stabilisation and familiarisation can all affect performance.
Shoulder strength values vary by age, sex, body size, sport, limb dominance, test position, device placement and testing method. Broad normative values should be used cautiously unless the testing protocol and population match.
For most Measurz use, the most practical benchmarks are the client’s baseline, side-to-side comparison and progress across sessions.
Handheld dynamometry can be reliable for shoulder strength testing when the protocol is standardised. Reliability improves when the same position, device placement, examiner instructions, trial number, rest period and scoring method are used across sessions.
Shoulder strength testing is valid as a measure of force production in the selected test position. It should not be interpreted as a complete measure of shoulder capacity, shoulder health or sport readiness.
Common errors include inconsistent device placement, poor stabilisation, changing test position, allowing trunk movement, allowing elbow drift, using different trial scoring methods, ignoring pain and comparing results across different positions.
Limitations include position specificity, pain inhibition, tester strength, learning effect, device variation and compensation during maximal effort.
Use shoulder strength testing to monitor external rotation, internal rotation and abduction strength over time. Results can support upper-limb programming, side-to-side comparison, progress tracking and decisions about whether additional ROM, strength or functional tests are needed.
Shoulder strength testing is most useful when interpreted alongside shoulder ROM, upper-limb strength tests, closed-chain tests, power tests and the client’s training or sport demands.
Record each shoulder strength test separately.
For each test, record:
Test name
Side tested
Body position
Shoulder position
Elbow angle
Device placement
Trial scores
Best or average score
Pain score
Symptom location
Body weight if normalising force
Compensation notes
Comparison side
Retest date
For external rotation and internal rotation, record the shoulder angle and whether the arm was tested by the side or in an abducted position.
For abduction testing, record the arm angle, arm plane, device landmark and whether the test was performed in abduction or scaption.
Useful compensation notes include trunk rotation, trunk lean, shoulder shrug, elbow drift, wrist compensation, poor hold time, pain-limited effort or inconsistent force output.
Shoulder Flexion ROM Test
Shoulder Abduction ROM Test
Shoulder External Rotation ROM Test
Shoulder Internal Rotation ROM Test
Push-Up Test
Closed Kinetic Chain Upper Extremity Test
Med Ball Throw
Bench Press 1RM Test
Posterior Shoulder Endurance Test
It measures force production in a defined shoulder position.
Yes. Each test measures a different movement direction and should be recorded separately.
No. It provides strength information only and should be interpreted alongside other findings.
Yes. Pain score and symptom location are important because pain can influence force output.
Either can be used if applied consistently. The scoring method should be recorded.
Shoulder strength testing should use a standardised position and device placement.
External rotation, internal rotation and abduction should be recorded separately.
Results are position-specific and should not be overgeneralised.
Pain, compensation and trial method should always be recorded.
Use Measurz to track force, side comparison and progress across sessions.
Chamorro, C., Armijo-Olivo, S., De la Fuente, C., Fuentes, J., & Chirosa, L. J. (2017). Absolute reliability and concurrent validity of hand held dynamometry and isokinetic dynamometry in the shoulder rotator strength assessment: Systematic review and meta-analysis. International Journal of Sports Physical Therapy, 12(5), 776–788.
Saccol, M. F., et al. (2021). Reliability of shoulder strength assessment using handheld dynamometry: A systematic review. Physical Therapy in Sport, 49, 108–119.
Cools, A. M., et al. (2021). Inclinometer reliability for shoulder ranges of motion in individuals with subacromial impingement syndrome. Journal of Manipulative and Physiological Therapeutics, 44(3), 236–244.
