Maximal Voluntary Effort

Group 2

Jamar Hand Dynamometer

It is used to evaluate a person’s Maximum Voluntary Effort, based on hand dynamometer tests.

This test has been used for over 35 years for compensation determinations.

It accommodates various hand sizes and has 5 positions..

Work places:– Shelf Stockers– Construction– Administrative Assistant

Place of Employment

Happy Wrists

Sore Wrists

Test Procedures

Sit or stand with shoulder adducted and neutral

Elbow at 90 degrees Forearm and wrist in neutral position Test should repeated 3 times and the

average will be the final result.

Set the adjustable handle to desired spacing Rotate the red peak-hold needle counter clockwise

to 0 Start with the smallest grip setting, right and then the

left. Record reading Reset and redo alternating 3 times left and right side. Evaluee can take a break (no more than 2 minutes)

How is the test measured?

The test is measured by the coefficient of variation

CofV= Standard Deviation /Mean X 100

Our Data

Normative Data

Interpretation of Results

It is based on the following three outcomes:– CofV does not exceed the cut point for any trials.

This means the evaluee has demonstrated max effort

– CofV exceeds the cut point for fewer than three trials. This means that the evaluee has demonstrated a max voluntary effort in this test.

- CofV exceeds the cut point for three trials. The evaluee has not demonstrated max voluntary effort on the test.

Reason for less than max effort could be:

A) Unidentified impairment or tiring easily B) Fear of re-injury or test anxiety C) Symptom magnification syndrome

To help distinguish between three possible interpretations

1) Unidentified impairment 2) Fear Response 3) Symptom magnification syndrome

Rapid Exchange Grip Test:

It helps to identify maximal grip strength in individuals with whom the evaluator is not believe the evaluee is giving maximal effort. It also will add further validity to the original JAMAR MVE findings.

Testing Procedure:

Test is done after the 5 position static grip test REG setting is a setting that the evaluee did their

best Evaluee must not know the results Evaluee switches hands rapidly while providing max

grip effort on each trial The Dynamometer should be held by the evaluator in

a position where they can reset the gauge easily Verbal encouragement and quickness is needed

Results

Positive: If the score is greater than or equal to the static score. Suggests lack of full effort

Negative- If the score is less than (around 15%) than the static score.

Jamer Hydraulic Gauge

It is designed for use in hand strength testing applications- Specifically the measurement of tip, key and palmer pinch.

Can also be used as a diagnostic, or as a means of monitoring progress of rehabilitation of the hand.

Tip Pinch- Thumb tip to index finger tip Key Pinch- Thumb pad to lateral aspect of

the middle phalanx of index finger Palmer Pinch- Thumb pad to pads of index

and middle finger

Average Performance for Tip Pinch

Average Performance for Key Pinch

Average Performance for Palmar Pinch

Alternatives

Smedley Hand Dynamometer   – for measuring grip strength, fatigue rate, and

recovery rate. The dominant hand should be 10% stronger than the nondominant hand. This comparison is frequently used in neuropsychological test batteries to assess function of the nervous system.