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Comparison of Rolyan and Jamar dynamometers for measuring grip strength
1Program in Occupational Therapy, University of Minnesota, Minneapolis, MN 55455, USA. mathi003@umn.edu
Occupational Therapy International
|October 11, 2002
Summary
The Jamar and Rolyan hydraulic dynamometers demonstrate high reliability and validity for measuring grip strength. These devices can be used interchangeably in clinical settings, allowing therapists to use existing normative data.
Area of Science:
- Rehabilitation Medicine
- Biomedical Engineering
- Clinical Measurement
Background:
- Grip strength is a crucial measure in clinical assessments.
- Accurate and reliable dynamometers are essential for evaluating grip strength.
- Comparing different dynamometer models ensures consistency in clinical practice.
Purpose of the Study:
- To compare the Jamar and Rolyan hydraulic dynamometers.
- To determine their concurrent validity with known weights.
- To assess inter-instrument reliability and concurrent validity in a clinical setting.
Main Methods:
- A repeated measure design was employed.
- Thirty males and 30 females participated in the study.
- Grip strength was measured using both Jamar and Rolyan dynamometers.
Main Results:
- Both dynamometers showed high concurrent validity with known weights (r >= 0.9994).
- Inter-instrument reliability was excellent (intraclass correlation coefficients 0.90-0.97).
- No significant differences were found between the dynamometers' grip strength measurements.
Conclusions:
- Jamar and Rolyan hydraulic dynamometers measure grip strength equivalently.
- The devices can be used interchangeably in clinical practice.
- Therapists can confidently use normative data collected with the Jamar dynamometer for the Rolyan dynamometer.