1. Maximal Voluntary Effort
Group 2

3. 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..

4. Work places:
Shelf Stockers
Construction
Administrative Assistant

5. Place of Employment

6. Happy Wrists

7. Sore Wrists

8. 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.

9. 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)

10. How is the test measured?
The test is measured by the coefficient of variation
CofV= Standard Deviation /Mean X 100

11. Our Data

12. Normative Data

13. 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.

14. 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

15. To help distinguish between three possible interpretations
1) Unidentified impairment
2) Fear Response
3) Symptom magnification syndrome

16. 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.

17. 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

18. 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.

19. 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.

20. 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

21. Average Performance for Tip Pinch

22. Average Performance for Key Pinch

23. Average Performance for Palmar Pinch

24. 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.