The Wrist Extension Strength Test measures the maximum isometric force produced when lifting the back of the hand towards the forearm. Using the Anker, the assessment provides an objective and repeatable measure of wrist extensor strength in a standardised position.
Wrist extension strength is critical for grip performance because the wrist extensors stabilise the wrist during forceful gripping. It is also important during lifting, pushing, racquet sports, throwing, climbing, manual handling and many occupational tasks requiring sustained hand function.
The primary muscles assessed include extensor carpi radialis longus, extensor carpi radialis brevis and extensor carpi ulnaris.
When used with Measurz, the Anker records peak force and can calculate additional metrics including force relative to body weight, impulse, torque (when the lever arm is entered), rate of force development, time to peak and fatigue index.
The assessment measures muscle force only and should always be interpreted alongside symptoms, wrist mobility, grip strength and functional performance.
The Wrist Extension Strength Test is an isometric assessment where the client attempts to lift the back of the hand towards the forearm while maintaining a stable forearm and elbow.
The assessment is typically performed with the elbow flexed to approximately 90°, the forearm supported and the wrist beginning in a neutral position. Standardising the testing position improves consistency between assessments.
The Anker provides fixed resistance, allowing objective and repeatable strength assessment when client positioning, anatomical landmarks and verbal instructions remain unchanged.
Explain that the assessment measures how strongly they can lift the back of their hand without moving the forearm.
Record any:
wrist pain
forearm pain
hand pain
previous wrist injury
previous surgery
neurological symptoms
fatigue
Complete one or two familiarisation contractions before maximal testing.
Position the client:
seated upright
forearm fully supported
elbow flexed to approximately 90°
forearm pronated
wrist in neutral
fingers relaxed
Maintain identical positioning during every reassessment.
Ensure:
the forearm remains supported
the elbow remains still
the wrist begins in neutral
the hand remains relaxed
Position the Anker load cell against the dorsal surface of the second and third metacarpals, immediately proximal to the metacarpal heads.
Avoid direct pressure over the fingers or wrist joint.
Record the contact point to improve repeatability.
Prevent movement of:
forearm
elbow
shoulder
trunk
The movement should occur only as an isometric wrist extension effort.
Use consistent verbal cues.
"Lift the back of your hand."
"Increase the pressure smoothly."
"Push as hard as you can."
"Hold."
"Keep breathing."
Repeat the same wording during every reassessment.
Use:
1–2 familiarisation trials
2–3 maximal trials
3–5 second contractions
30–60 seconds rest between trials
Record either:
the highest force value, or
the average of the recorded trials
Maintain the same scoring method during future testing.
the forearm lifts
the elbow moves
the shoulder compensates
the wrist deviates
the fingers extend excessively
the load cell slips
pain limits maximal effort
the client starts before instructed
The assessment may be useful for:
establishing baseline wrist extensor strength
comparing left and right limbs
monitoring changes over time
upper-limb strength profiling
athlete performance assessment
objective reporting using Measurz
monitoring response to exercise
client education
The assessment should contribute to broader assessment reasoning and should not be used as a stand-alone diagnostic assessment.
The primary outcome is peak isometric wrist extension force.
When analysed in Measurz, additional metrics may include:
Peak force
Force relative to body weight
Impulse
Torque
Rate of force development
Time to peak
Fatigue index
The assessment does not directly measure:
wrist range of motion
ligament integrity
tendon pathology
grip endurance
readiness for work or sport
Higher force values generally indicate greater wrist extensor strength.
Lower force values may reflect:
pain
fatigue
previous injury
reduced confidence
inconsistent positioning
movement compensation
Interpret results by considering:
previous assessment results
left versus right differences
symptoms during testing
grip strength
occupational and sporting demands
Published Anker-specific normative values are currently unavailable.
Handheld dynamometry has demonstrated good reliability for wrist extensor testing when forearm position, wrist position and lever arm remain standardised. Comparing results with the client's own baseline and repeated testing using the same protocol provides the most meaningful assessment of change.
A side-to-side difference of approximately 10% or greater may warrant further assessment when accompanied by symptoms or functional limitations.
Youth
Interpret relative to growth, coordination and sporting participation.
Adults
Useful for baseline assessment and monitoring progress.
Older adults
Interpret alongside grip strength, hand function and activities of daily living.
Athletes
Particularly useful for racquet sports, climbing, golf, baseball, cricket and manual workers.
Clients with persistent symptoms
Interpret alongside pain, confidence and functional performance rather than strength alone.
Common errors include:
forearm lifting
elbow movement
wrist deviation
finger extension
inconsistent load cell placement
inconsistent verbal cueing
Limitations include:
results are position-specific
pain may reduce maximal force production
muscle strength alone does not determine upper-limb function
published Anker-specific normative values remain limited
The assessment may be useful for:
baseline assessment
progress monitoring
side-to-side comparison
upper-limb performance profiling
objective reporting within Measurz
educating clients using measurable outcomes
It measures maximal isometric wrist extension strength.
Extensor carpi radialis longus, extensor carpi radialis brevis and extensor carpi ulnaris.
Peak force is the primary outcome measure.
Yes. Bilateral testing allows meaningful comparison.
No. It measures muscle force only.
Measures maximal isometric wrist extension strength.
Primarily assesses the wrist extensor muscles.
Peak force is the primary routine outcome measure.
Consistent positioning and metacarpal contact point improve repeatability.
Measurz provides additional force-time metrics.
Compare results with previous assessments and the opposite limb.
Bohannon, R. W. (1997). Reference values for extremity muscle strength obtained by hand-held dynamometry from adults aged 20 to 79 years. Archives of Physical Medicine and Rehabilitation, 78(1), 26–32.
Stark, T., Walker, B., Phillips, J. K., Fejer, R., & Beck, R. (2011). Hand-held dynamometry correlation with the gold standard isokinetic dynamometry: A systematic review. PM&R, 3(5), 472–479.
Mentiplay, B. F., Perraton, L. G., Bower, K. J., Adair, B., Pua, Y. H., Williams, G. P., McGaw, R., & Clark, R. A. (2015). Assessment of lower limb muscle strength and power using hand-held and fixed dynamometry: A reliability and validity study. PLOS ONE, 10(10), e0140822.
