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A comparison of trunk extensor strength and squat lifting ability
J M Roberson1, P Witt, M T Gross
1Physical Therapy and Exercise Science Department, State University of New York at Buffalo 14214, USA.
The Journal of Orthopaedic and Sports Physical Therapy
|February 1, 1997
Summary
Back testing devices do not accurately predict lifting ability. Trunk extensor strength, body weight, and torso length showed no correlation with 30.5 cm to knuckle lifting performance in this study.
Area of Science:
- Occupational Health
- Biomechanics
- Physical Therapy
Background:
- Back testing devices are common in clinical settings for assessing functional capacity and return-to-work readiness.
- Limited research exists on the validity of these devices in accurately reflecting job task performance.
Purpose of the Study:
- To investigate correlations between squat lifting performance and trunk extensor strength (isoinertial and isometric).
- To determine relationships between torso length, body weight, and trunk extensor strength.
- To assess if trunk extensor strength can predict lifting ability (30.5 cm to knuckle).
Main Methods:
- Twenty-eight subjects participated in two testing sessions.
- Included B200 testing and assessment of 30.5 cm to knuckle lifting ability.
- Statistical analyses included regression and correlation.
Main Results:
- Body weight and torso length did not correlate with trunk extensor strength.
- Neither isometric nor isoinertial trunk extensor strength accurately estimated 30.5 cm to knuckle lifting ability.
- The study found no significant relationship between the tested anthropometric measures and functional lifting capacity.
Conclusions:
- Current anthropometric measures like body weight and torso length are insufficient for estimating trunk extensor strength.
- Functional testing, rather than strength measurements alone, is recommended for evaluating an individual's work capacity.
- Further research should explore other anthropometric variables for strength estimation.