Related Experiment Videos
Accuracy of Spring and Strain Gauge Hand-held Dynamometers
The Journal of Orthopaedic and Sports Physical Therapy
|January 1, 1989
Summary
Strain gauge dynamometers demonstrated greater accuracy than spring gauge models when measuring force. This finding suggests strain gauge devices may be a more reliable choice for force measurement after extensive use.
Area of Science:
- Biomechanics
- Measurement Science
Background:
- Hand-held dynamometers are commonly used in clinical and research settings.
- Assessing the accuracy of these devices, particularly after prolonged use, is crucial for reliable data collection.
Purpose of the Study:
- To compare the accuracy of spring gauge and strain gauge hand-held dynamometers.
- To determine if extensive prior use affects dynamometer accuracy.
Main Methods:
- Two spring gauge and two strain gauge dynamometers were tested using certified weights from 5 to 55 lbs in 5 lb increments.
- Analysis of variance (ANOVA) and Pearson product moment correlations were employed to analyze the data.
Main Results:
- Both types of strain gauge dynamometers showed measurements not significantly different from actual certified weights.
- Spring gauge dynamometers exhibited measurements that differed significantly from actual weights.
- High correlations (≥0.98) were found between measurements from devices of the same type.
Conclusions:
- Strain gauge dynamometers appear to be more accurate than spring gauge dynamometers, especially after considerable use.
- The findings suggest strain gauge technology may offer superior reliability for force measurement applications.