The Shoulder Horizontal Abduction [Muscle Meter] test measures how much force a client can produce when moving the arm away from the midline in a horizontal plane against resistance. It is commonly used to assess isometric posterior shoulder and scapular retraction-related force in a controlled setup. This can provide useful context for pulling, rowing, throwing preparation, overhead sport, posture-related loading, shoulder-girdle strength profiling and progress tracking.
The Muscle Meter is used to measure force output during the test. When used on its own, the Muscle Meter primarily measures peak force, which is the highest force value produced during the effort. When used with Measurz, Muscle Meter data can be recorded and analysed with broader strength and force-time metrics, including peak force, impulse, torque, rate of force development, time to peak and fatigue index.
For routine shoulder horizontal abduction testing, peak force is usually the main metric. Force as a percentage of body weight may be useful if directly calculated from the client’s test force and body weight, especially for baseline comparison, side-to-side comparison and retesting. Torque may be useful if the lever arm is measured and a more biomechanical interpretation is required. Rate of force development and time to peak may be useful when rapid posterior shoulder or pulling force matters, such as throwing, swimming, grappling, climbing, rowing or contact sport tasks. Impulse may be useful if sustained force over a defined time window is intentionally tested. Fatigue index is only relevant if repeated or sustained horizontal abduction contractions are part of the protocol.
The result can support assessment reasoning and progress tracking, but it does not diagnose shoulder pain, scapular dyskinesis, posterior shoulder weakness, nerve injury, injury risk, sport readiness or work capacity on its own.
The Shoulder Horizontal Abduction [Muscle Meter] test is an isometric force assessment where the client pushes or pulls the arm backwards or away from the midline in the horizontal plane into the Muscle Meter without visible shoulder movement.
The movement direction is shoulder horizontal abduction. The test may be performed prone, seated, standing or in another standardised position depending on the goal and available setup.
The Muscle Meter is positioned so the client produces force in the intended horizontal abduction direction. Depending on the protocol, the device may be placed against the distal humerus, forearm, wrist or hand.
This test may involve the posterior deltoid, middle trapezius, rhomboids, rotator cuff and other scapular stabilisers depending on body position and arm angle.
Consistent setup matters because shoulder elevation angle, arm rotation, elbow position, forearm position, trunk position, scapular position, device placement, strap angle, stabilisation and client effort can all affect the result. This test measures force output in a specific setup. It does not fully measure shoulder control, rowing capacity, throwing performance, scapular coordination, posture, endurance or movement quality on its own.
Prepare the client
Explain that the test measures how strongly they can move the arm backwards or away from the body into the Muscle Meter.
Record baseline symptoms, shoulder discomfort, posterior shoulder symptoms, neck symptoms, upper back symptoms, elbow symptoms, fatigue, recent training and confidence with the test.
Use at least one submaximal practice trial so the client understands the movement direction and avoids excessive trunk, neck or elbow compensation.
Set the client position
Choose a repeatable test position.
Common options include prone, seated or standing. Prone or strap-stabilised setups may reduce trunk compensation and improve repeatability.
Record:
body position
side tested
shoulder elevation angle
arm rotation position
elbow angle
forearm position
wrist or hand position
trunk position
scapular starting position
whether straps or handheld resistance are used
Set up the Muscle Meter
Place the Muscle Meter or strap so the client can produce horizontal abduction force in the intended direction.
For improved repeatability, use a strap-stabilised or fixed setup where possible. If handheld, record this because handheld scores may be influenced by professional strength and stabilisation.
Place the device or strap
Position the device at the agreed contact point, such as the distal humerus, forearm, wrist or hand depending on the protocol.
Avoid uncomfortable pressure on bony areas, the elbow, wrist or sensitive tissue.
Stabilise the position
Stabilise the trunk and shoulder girdle so the client does not compensate with trunk rotation, shoulder shrugging, neck movement, elbow bending, scapular elevation or breath holding beyond the intended setup.
Give clear instructions
Use consistent instructions such as:
“Push your arm back into the device as hard as you can and hold.”
“Build up smoothly, then push hard.”
“Keep your trunk and shoulder position still.”
“Keep breathing.”
“Tell me if you feel pain, cramping, tingling or anything unusual.”
Record trials
Use 1–2 practice trials, then record 2–3 maximal trials.
A common contraction duration is 3–5 seconds.
Rest for 30–60 seconds between trials, or longer if symptoms, cramping or fatigue occur.
Record whether the final score uses the best trial or average of recorded trials.
Identify invalid trials
Repeat or mark a trial as invalid if:
the trunk rotates
the shoulder position changes
the elbow angle changes
the device slips
the strap or anchor moves
the client pushes in a different direction
the neck extends or rotates
pain limits effort
the client starts before the device is ready
the professional cannot hold the device steady
the effort becomes more of a trunk or whole-body movement than shoulder horizontal abduction
Record symptoms
Record shoulder pain, posterior shoulder discomfort, neck pain, upper back symptoms, elbow symptoms, paraesthesia, cramping, confidence and apprehension.
For retesting, match the same position, device placement, shoulder angle, instructions, contraction duration, rest period, scoring method and symptom recording.
The Shoulder Horizontal Abduction [Muscle Meter] test is used to quantify posterior shoulder and scapular retraction-related force output in a repeatable setup.
It may be useful for:
baseline shoulder strength assessment
side-to-side comparison
monitoring change over time
tracking upper-limb strength after reduced loading
supporting pulling and rowing strength profiling
assessing posterior shoulder force context
supporting overhead sport, throwing, swimming or climbing assessment
comparing strength with shoulder ROM, scapular control, horizontal adduction and push/pull tests
client education
The test should support assessment reasoning. It should not be used as a stand-alone diagnostic or clearance measure.
The test primarily measures isometric shoulder horizontal abduction force in the chosen setup.
It may provide useful information about:
horizontal abduction force capacity
posterior shoulder force context
scapular retraction force context
side-to-side force difference
confidence producing posterior shoulder force
pain response during resisted horizontal abduction
change in force over time
relationship between strength and related pulling or overhead tasks
It does not directly measure:
isolated posterior deltoid strength
isolated middle trapezius strength
isolated rhomboid strength
scapular coordination
posture
shoulder diagnosis
rowing performance
throwing performance
sport readiness
work readiness
A higher score may suggest greater horizontal abduction force output in that specific setup. A lower score may suggest reduced force output, but the reason should be interpreted carefully.
Lower force may be influenced by pain, apprehension, poor familiarisation, fatigue, guarding, shoulder symptoms, neck symptoms, inconsistent device placement, poor stabilisation, altered shoulder angle or reduced confidence.
One result should not be interpreted in isolation. Interpretation is strongest when the same setup is repeated over time and reviewed alongside symptoms, confidence, movement quality, related tests and functional goals.
Important influences include:
shoulder elevation angle
arm rotation position
elbow angle
device placement
strap angle
trunk position
neck position
scapular starting position
stabilisation
pain
apprehension
fatigue
guarding
breath holding
client confidence
professional strength if handheld
Published Muscle Meter-specific universal norms for Shoulder Horizontal Abduction are limited.
Shoulder and scapular muscle dynamometry research supports the use of standardised isometric testing, but values are protocol-specific. Device type, body position, arm position, contact point, stabilisation and scoring method must match closely before applying published values.
For most Measurz use, the most useful comparisons are:
the client’s own baseline
right versus left comparison
change across retests
pain or symptom response
confidence during testing
relationship to related shoulder and upper-limb assessments
bodyweight-normalised force if directly calculated
A side-to-side difference of around 10% or more is often worth reviewing more closely in strength testing, especially if it matches symptoms, previous injury, confidence changes or functional differences. This should not be used as a strict pass/fail rule.
Reference values provide context, not diagnostic or clearance cut-offs.
Use this order:
compare with the client’s own baseline
compare right and left sides when relevant
consider symptoms during and after testing
consider confidence and effort quality
review whether compensations were present
compare with related strength, mobility or performance tests
relate the result to sport, gym, work or daily-life demands
retest under the same conditions to monitor change
do not use reference values as pass/fail criteria
Use for maximum horizontal abduction force output, baseline strength, side-to-side comparison, progress tracking and comparing force across retests.
Look for best score or average score, consistent setup, side-to-side difference, change from baseline, pain response and compensation during maximal effort.
Use only when calculated directly from test force and body weight.
Look for changes over time and side-to-side differences. Do not treat it as a universal target unless the comparison data use the same method.
Use only when lever arm is measured and a more biomechanical interpretation is needed.
Torque may help when arm length or device contact point changes the raw force reading. It should not be used as normative data unless the reference data match the setup closely.
Use when rapid posterior shoulder or pulling force production matters, such as throwing, swimming, rowing, climbing, grappling or contact sport tasks.
Look for early force production and whether RFD changes while peak force stays similar.
Use to understand whether force is produced quickly or gradually.
Look for delayed peak force, faster time to peak across retests, and whether a slower time reflects caution, pain, poor cueing or actual performance difference.
Use only if a sustained force window is intentionally tested.
Look for whether the client can produce and sustain force briefly and whether impulse improves while peak force stays similar.
Use only if repeated or sustained horizontal abduction contractions are part of the protocol.
Look for drop-off across repeated trials, symptom-related fatigue and whether fatigue improves across a training block.
Consider growth, maturation, coordination, attention, training age and familiarisation. Practice trials are important so the client learns to push backwards or away from the body without excessive trunk or shoulder compensation.
Use the test for baseline strength, progress tracking and confidence with pulling or posterior shoulder force. Compare results with shoulder ROM, rowing strength, push-pull balance and general training goals.
Consider shoulder comfort, neck symptoms, fatigue, daily reaching or pulling tasks and confidence. A lower score may provide useful context, but it should not be interpreted without functional assessment.
Consider throwing, swimming, rowing, climbing, grappling, tackling, contact sport and gym demands. Peak force alone does not equal sport performance, but it can support a broader upper-limb strength profile.
Consider pulling, carrying, reaching, bracing, lifting and manual handling demands. Do not use one strength score to clear work duties.
Use the test to monitor force output, confidence and symptom response over time. Strength alone should not confirm readiness.
Pain, fear, guarding, fatigue, apprehension and confidence may influence force. Record symptoms carefully and compare with related findings.
Absolute force and force relative to body mass may both be useful. Avoid assumptions and interpret the result in relation to goals, symptoms and function.
Repeatability improves when the same setup is used each time.
Record and standardise:
same body position
same side tested
same shoulder elevation angle
same arm rotation position
same elbow position
same trunk position
same neck position
same scapular position
same device placement
same strap setup, if used
same anchor height and distance, if straps are used
same stabilisation
same instructions
same contraction duration
same rest period
same scoring method
same symptom and compensation recording
Shoulder and scapular dynamometry can be reliable when protocols are standardised. However, handheld testing may be affected by the professional’s ability to stabilise the device. Strap-stabilised or fixed setups can improve consistency where available.
Because horizontal abduction can be tested in several positions, results should be interpreted as protocol-specific.
Common errors include:
inconsistent device placement
changing shoulder elevation angle
changing arm rotation position
changing elbow position
allowing trunk rotation
allowing neck movement
allowing shoulder shrugging
poor stabilisation
device slipping
strap or anchor movement
breath holding
testing through high pain
comparing different protocols directly
treating the score as a diagnosis
Limitations include:
testing is setup-dependent
manual resistance may be limited by professional strength
strap setup requires careful anchor control
Muscle Meter-specific universal norms may be limited
pain, fear or guarding can reduce force output
peak force does not measure endurance or movement quality
side-to-side symmetry does not automatically mean function is ready for sport or work
the test does not determine sport or work readiness on its own
The Shoulder Horizontal Abduction [Muscle Meter] test may be useful for:
establishing a baseline
tracking horizontal abduction strength over time
comparing right and left sides
reviewing force relative to body weight if directly calculated
monitoring response to exercise or intervention
supporting pulling, rowing and posterior shoulder strength profiling
comparing with shoulder ROM, scapular control, horizontal adduction and push-pull tests
educating the client about measurable progress
reviewing sport, gym, work or daily-life demands
If force is low on both sides, consider assessing shoulder ROM, thoracic mobility, pulling strength, scapular control, fatigue and confidence with loading.
If one side is much lower, compare with symptoms, injury history, shoulder mobility, neck symptoms, upper-limb strength and functional tasks.
If pain limits the result, record the pain response and review whether the test position, pressure point or effort level needs modification.
If force is good but function is limited, compare with rowing capacity, scapular control, throwing, swimming, pulling tasks and sport or work demands.
If the client is improving, keep the same protocol and monitor whether strength, symptoms, confidence and function improve together.
Position: Prone, seated or standing, standardised
Start position: Shoulder and elbow position recorded
Joint or trunk angle: Record shoulder elevation angle, arm rotation position, elbow angle, trunk position and scapular position
Trials: 1–2 practice trials, then 2–3 recorded trials
Contraction duration: 3–5 seconds
Rest: 30–60 seconds between efforts
Metric: Peak force, plus percentage of body weight only if directly calculated
Attachment or device setup: Muscle Meter positioned for shoulder horizontal abduction force; strap-stabilised or fixed setup if used
Final score: Best trial or average of trials
Key retesting requirement: Same position, device placement, shoulder angle, instructions, contraction duration, rest and scoring method
It measures isometric force output as the client pushes or pulls the arm backwards or away from the body in the horizontal plane.
No. It may bias the posterior shoulder, but middle trapezius, rhomboids, rotator cuff, trunk and scapular stabilisers may contribute depending on the setup.
It can be if calculated directly from test force and body weight. Use it for baseline and side-to-side comparison rather than as a universal target.
Published universal Muscle Meter norms for this exact protocol are limited. Baseline comparison, side-to-side comparison and retesting under the same setup are usually more useful.
No. It can measure force output, but it does not diagnose scapular movement issues or explain symptoms on its own.
Changing shoulder angle or arm rotation changes the force direction and muscle contribution. Record the position and repeat it at retest.
Different device placement, shoulder position, trunk compensation, stabilisation, fatigue, pain and inconsistent instructions can affect results.
Record side, position, shoulder angle, device placement, peak force, percentage of body weight if directly calculated, symptoms, compensations, confidence, scoring method and related findings.
Shoulder Horizontal Abduction [Muscle Meter] measures isometric posterior shoulder and horizontal abduction force.
Peak force is usually the main routine Muscle Meter metric.
Percentage of body weight should only be used when calculated directly from force and body weight.
Setup consistency is essential because shoulder angle, arm rotation, device placement and stabilisation strongly affect the result.
Baseline comparison, side-to-side comparison and retesting consistency are usually more useful than broad norms.
Measurz should capture setup, symptoms, bodyweight-normalised values where directly calculated, compensations and retesting conditions.
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Katoh, M. (2015). Test-retest reliability of isometric shoulder muscle strength measurement with a handheld dynamometer and belt. Journal of Physical Therapy Science, 27(6), 1719–1722. https://doi.org/10.1589/jpts.27.1719
Manchado, M. C., et al. (2023). Isometric shoulder testing using a forcemeter is a reliable method for muscle function evaluation. Sensors, 23(22), 9106. https://doi.org/10.3390/s23229106
Michener, L. A., Boardman, N. D., Pidcoe, P. E., & Frith, A. M. (2005). Scapular muscle tests in subjects with shoulder pain and functional loss: Reliability and construct validity. Physical Therapy, 85(11), 1128–1138.
Moraux, A., Canal, A., Ollivier, G., Ledoux, I., Doppler, V., Payan, C., & Hogrel, J.-Y. (2023). Psychometric properties of a standardized protocol of muscle strength assessment by hand-held dynamometry in healthy adults. BMC Musculoskeletal Disorders, 24, 311. https://doi.org/10.1186/s12891-023-06400-2
