Strength Isometric Test: Supination Resistance Test

The Supination Resistance Test [Muscle Meter] measures the amount of external force required to initiate supination of the foot and ankle in a weight-bearing position. It is commonly used to provide context for foot posture, subtalar joint mechanics, lower-limb loading, footwear or orthotic reasoning, running assessment and progress tracking.

The Muscle Meter is used to quantify the force required to lift or supinate the medial arch/foot region in a standardised position. When used on its own, the Muscle Meter primarily measures peak force, which is the highest force value recorded during the test. When used with Measurz, Muscle Meter data can be recorded and analysed with broader force-time metrics, including peak force, impulse, torque, rate of force development, time to peak and fatigue index.

For routine Supination Resistance Test use, 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 because body mass can influence foot loading. Torque may be useful only if a lever arm is measured and a biomechanical interpretation is required. Rate of force development, time to peak, impulse and fatigue index are usually less central for routine supination resistance testing unless the protocol intentionally includes a specific force-time analysis.

The result can support assessment reasoning and progress tracking, but it does not diagnose plantar fasciopathy, posterior tibial tendon dysfunction, flat feet, ankle instability, foot posture problems, injury risk, running capacity or orthotic need on its own.

What Is the Supination Resistance Test [Muscle Meter]?

The Supination Resistance Test is a weight-bearing foot and ankle assessment that estimates how much force is required to move the foot toward supination.

In a Muscle Meter setup, the client usually stands with body weight distributed in a standardised way while the device is used to apply upward or supinating force to the medial side of the foot. The force needed to initiate supination is recorded.

The test is not a pure muscle strength test. It is more accurately described as a mechanical resistance or force requirement test. It reflects how much external force is required to supinate the foot in that specific standing setup.

Consistent setup matters because stance width, foot posture, body weight distribution, contact point, device angle, footwear, surface and examiner technique can all affect the result. This test measures force requirement in a specific weight-bearing setup. It does not fully measure foot strength, gait, running mechanics, injury risk or orthotic requirement on its own.

Step-by-Step Protocol / Practice

1. Prepare the client

Explain that the test estimates how much force is required to move the foot toward supination while standing.

Record baseline symptoms, foot pain, arch discomfort, heel pain, ankle symptoms, calf symptoms, recent activity, footwear, fatigue and confidence with standing assessment.

Use a gentle practice application so the client understands the test and does not actively resist or assist the movement.

2. Set the client position

A common setup is standing with both feet on a flat surface.

Record:

• barefoot or footwear condition
• stance width
• foot angle
• knee position
• body weight distribution
• test side
• support used
• whether the opposite foot remains loaded
• whether the client is relaxed or instructed to maintain posture

3. Set up the Muscle Meter

Set the Muscle Meter so it measures the force required to initiate supination in the intended direction.

The device may be placed against the medial arch, medial forefoot, navicular-region contact area or another defined contact point depending on the chosen protocol. The exact contact point must be recorded.

4. Place the device

Position the Muscle Meter comfortably against the chosen foot landmark.

Avoid excessive pressure on sensitive bony areas. Keep the force direction consistent and avoid pushing into the skin or soft tissue in a way that changes the measurement.

5. Stabilise and standardise the position

Ask the client to keep the same standing posture and avoid shifting weight, lifting the toes, gripping the floor, bending the knee, rotating the hip or actively assisting the movement.

6. Give clear instructions

Use consistent instructions such as:

“Stand relaxed and keep your weight even.”

“Do not help or resist the movement.”

“I am going to apply force until the foot begins to move.”

“Tell me if you feel pain, discomfort or anything unusual.”

7. Record trials

Use one gentle familiarisation trial, then record 2–3 measured trials.

Rest briefly between trials if the foot becomes uncomfortable or the client starts to actively resist.

Record whether the final score uses the best trial, average of trials or first valid trial.

8. Identify invalid trials

Repeat or mark a trial as invalid if:

• the client shifts weight
• the knee or hip position changes
• the foot lifts unexpectedly
• the toes grip strongly
• the contact point changes
• the device slips
• the force direction changes
• pain limits the test
• the client actively assists or resists the movement
• the examiner cannot identify the movement endpoint consistently

9. Record symptoms

Record foot pain, arch discomfort, heel symptoms, ankle symptoms, calf symptoms, confidence, apprehension and any symptom response after testing.

For retesting, match the same stance, body weight distribution, device placement, force direction, endpoint definition, scoring method and symptom recording.

Why It Is Used

The Supination Resistance Test is used to quantify the external force required to supinate the foot in a weight-bearing position.

It may be useful for:

• baseline foot and ankle mechanical assessment
• side-to-side comparison
• monitoring change over time
• supporting foot posture and lower-limb loading assessment
• providing context for footwear or orthotic reasoning
• comparing force requirement with symptoms and function
• assessing running or walking-related foot mechanics context
• reviewing changes after footwear, orthotic, mobility or strength interventions
• client education

The test should support assessment reasoning. It should not be used as a stand-alone diagnostic, prescription or clearance measure.

What It Measures

The test primarily measures the external force required to initiate foot supination in a standardised standing setup.

It may provide useful information about:

• supination resistance
• foot and ankle mechanical loading context
• side-to-side difference
• force required to alter foot posture
• symptom response to supination loading
• change in force requirement over time
• relationship between foot mechanics and related tasks

It does not directly measure:

• isolated muscle strength
• foot posture diagnosis
• subtalar joint pathology
• plantar fascia tissue status
• posterior tibial tendon function
• orthotic requirement
• running gait quality
• balance
• sport readiness
• work readiness

Understanding the Result, Reference Values and What to Look For

What a higher or lower result may suggest

A higher score means more external force was required to initiate supination in the tested setup. A lower score means less external force was required.

A higher result may suggest greater resistance to supination under weight-bearing. A lower result may suggest the foot was easier to supinate. However, the meaning depends on symptoms, foot posture, body size, stance, loading, movement tasks and related findings.

A high or low value should not be interpreted as good or bad in isolation. Interpretation is strongest when the same setup is repeated over time and reviewed alongside symptoms, gait, footwear, training load, lower-limb strength, balance and functional goals.

What can influence the result

Important influences include:

• body weight
• weight distribution
• foot posture
• stance width
• foot angle
• knee position
• footwear
• surface
• contact point
• device angle
• examiner technique
• pain
• guarding
• toe gripping
• apprehension
• client relaxation
• symptom sensitivity

Normative, reference and comparative values

Recent research has begun to report normative values for the Supination Resistance Test, which strengthens interpretation. However, values remain protocol-specific and should only be applied when the measurement method, population and force application approach are comparable.

For routine Measurz use, the most useful comparisons are:

• the client’s own baseline
• right versus left comparison
• change across retests
• pain or symptom response
• relationship to running, walking or standing symptoms
• relationship to footwear or orthotic changes
• bodyweight-normalised force if directly calculated

A side-to-side difference is worth noting, especially if it aligns with symptoms, prior injury, footwear response, balance differences or gait observations.

Reference values provide context, not diagnostic or orthotic prescription cut-offs.

Practical interpretation priorities

Use this order:

• compare with the client’s own baseline
• compare right and left sides when relevant
• consider symptoms during and after testing
• consider body weight distribution and stance consistency
• review whether the client actively resisted or assisted
• compare with related foot posture, strength, mobility and gait findings
• relate the result to walking, running, sport, work or daily-life demands
• retest under the same conditions to monitor change
• do not use reference values as pass/fail criteria

What to Look at for Each Relevant Muscle Meter Metric

Peak force

Use for the maximum force required to initiate supination in the tested setup.

Look for consistent setup, right-left comparison, change from baseline, symptom response, body weight distribution and whether the endpoint was identified consistently.

Force as percentage of body weight

Use only when calculated directly from test force and body weight.

This may help interpret the force requirement relative to the client’s size, but it should not be treated as a universal target unless comparison data use the same method.

Torque

Use only when a lever arm is measured and a specific biomechanical interpretation is needed.

For routine use, peak force and bodyweight-normalised force are usually more practical than torque.

Rate of force development

RFD is usually not central to routine Supination Resistance Test interpretation because the goal is to determine force required to initiate movement, not rapid force production.

Use only if the protocol is specifically designed for force-time analysis.

Time to peak

Time to peak is usually not central for routine use.

It may be useful only if the protocol includes a controlled ramp and the professional wants to understand how force was applied.

Impulse

Impulse is usually not central unless the protocol intentionally uses a sustained force application over a defined time window.

Fatigue index

Fatigue index is generally not relevant unless repeated or sustained supination resistance trials are intentionally used.

Assessing and Providing Context for Different Client Populations

Youth clients

Consider growth, foot posture changes, coordination, attention and ability to relax during testing. Practice and clear instructions are important.

Adults and general fitness clients

Use the test for baseline foot mechanics context, side-to-side comparison and progress tracking. Compare results with symptoms, footwear, walking and training goals.

Older adults

Consider balance, foot comfort, skin sensitivity, footwear, standing tolerance and confidence. Support may be required, but it must be recorded.

Athletes and sport clients

Consider running, jumping, cutting, landing, footwear, training load and sport-specific foot loading. The result can support a broader foot and ankle profile but does not determine sport readiness.

Workplace and manual task clients

Consider prolonged standing, footwear, surface exposure, walking distance, stairs, carrying and manual task demands. Do not use one score to clear work duties.

Clients with foot or ankle symptoms

Pain, guarding, apprehension, footwear and symptom sensitivity may influence the result. Record symptoms carefully and compare with related findings.

Higher body mass clients

Body weight may influence supination resistance. Absolute force and force relative to body mass may both be useful if interpreted carefully.

Reliability, Validity and Measurement Considerations

Repeatability improves when the same setup is used each time.

Record and standardise:

• same barefoot or footwear condition
• same surface
• same stance width
• same foot angle
• same weight distribution
• same knee position
• same side tested
• same device contact point
• same force direction
• same endpoint definition
• same number of trials
• same scoring method
• same symptom and compensation recording

Published research supports the Supination Resistance Test as a reliable foot and ankle measure when the protocol is standardised. It has also been studied in relation to foot and ankle biomechanics and symptomatic foot and ankle groups.

Because results are strongly setup-dependent, the test should be interpreted as a protocol-specific force requirement measure rather than a broad diagnosis.

Common Errors and Limitations

Common errors include:

• inconsistent contact point
• changing force direction
• changing stance width
• changing foot angle
• changing footwear condition
• allowing weight shift
• allowing toe gripping
• not defining the movement endpoint
• applying force too quickly
• not recording symptoms
• comparing different protocols directly
• treating the score as a diagnosis or orthotic prescription rule

Limitations include:

• testing is setup-dependent
• endpoint judgement can vary
• body weight and stance affect results
• pain or guarding can affect results
• the test does not measure muscle strength directly
• reference values are protocol-specific
• high or low scores are not automatically good or bad
• the test does not determine footwear, orthotic, sport or work decisions on its own

Practical Applications

The Supination Resistance Test [Muscle Meter] may be useful for:

• establishing a baseline foot mechanics measure
• comparing right and left sides
• tracking changes over time
• reviewing response to footwear or orthotic changes
• comparing findings with foot posture and symptoms
• supporting running or walking assessment
• educating the client about measurable change
• reviewing sport, work or daily-life demands

Ideas to Make the Result Better

If supination resistance is high, consider reviewing symptoms, foot posture, footwear, calf capacity, ankle mobility, balance, gait and running mechanics.

If one side is much higher, compare with symptoms, previous injury, foot posture, strength, balance and walking or running observations.

If pain limits the test, record the pain response and consider modifying contact point, force direction or testing intensity.

If the result changes after footwear or orthotic modification, record the exact footwear, device or setup change.

If the client is improving, keep the same protocol and monitor whether force requirement, symptoms, confidence and function improve together.

Recommended Standard Protocol Summary

Position: Standing, weight-bearing, barefoot or footwear condition recorded
Start position: Standardised stance width, foot angle and weight distribution
Joint or trunk angle: Record knee position, foot posture and support use
Trials: 1 familiarisation trial, then 2–3 recorded trials
Contraction duration: Not a maximal contraction; apply force gradually until supination begins
Rest: Brief rest between trials as needed
Metric: Peak force required to initiate supination; percentage of body weight only if directly calculated
Attachment or device setup: Muscle Meter placed at a consistent medial foot contact point
Final score: Average of valid trials or best/selected value according to protocol
Key retesting requirement: Same stance, contact point, force direction, endpoint definition and scoring method

FAQs

What does the Supination Resistance Test measure?

It measures the external force required to initiate supination of the foot in a weight-bearing position.

Is it a muscle strength test?

Not exactly. It measures resistance to foot supination, not isolated muscle strength.

Should the result be recorded as percentage of body weight?

It can be if calculated directly from force and body weight. This may provide useful context because body size can influence foot loading.

Are there universal norms for this test?

Recent normative data are emerging, but values are protocol-specific. Use matched data only when the method and population are comparable.

Can this test diagnose plantar fasciopathy or posterior tibial tendon dysfunction?

No. It can provide useful foot mechanics context, but it does not diagnose conditions on its own.

Can this test prescribe orthotics?

No. It may help inform broader reasoning, but it should not be used alone to prescribe footwear or orthotics.

What can make the result unreliable?

Different stance, contact point, force direction, weight shift, footwear, pain, guarding and inconsistent endpoint judgement can affect results.

What should be recorded in Measurz?

Record side, stance, footwear, contact point, peak force, percentage of body weight if calculated, symptoms, weight shift, compensation and retest conditions.

Key Takeaways

• The Supination Resistance Test measures the force required to initiate foot supination.
• It is a weight-bearing mechanical resistance test, not an isolated strength test.
• 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.
• Baseline comparison, side-to-side comparison and retesting consistency are essential.
• Reference values provide context, not diagnostic, orthotic or clearance cut-offs.
• Measurz should capture stance, contact point, symptoms, force value and retesting conditions.

References

Movement Assessment Technologies. (2026). Supination Resistance Test. https://www.matassessment.com/blog/supination-resistance-test

Payne, C. (2023). The supination resistance test: What, why, how. Progressive Podiatry Project. https://www.progressivepodiatryproject.com/blog/the-supination-resistance-test-what-why-how

Razzante, M. C., Vicenzino, B., Rathleff, M. S., & others. (2024). Supination resistance variations in foot and ankle musculoskeletal disorders: A systematic review. Journal of Foot and Ankle Research. https://doi.org/10.1186/s13047-023-00681-5

Razzante, M. C., Vicenzino, B., & others. (2026). Establishing normative values for the Supination Resistance Test: An international study. Journal of Foot and Ankle Research.