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Comparison between tests of fatigue and force for trunk flexion
Ian Shrier1, Debbie Feldman, Jackie Klvana
1Centre for Clinical Epidemiology and Community Studies, SMBD-Jewish General Hospital, McGill University, Montreal, QC H3T 1E2, Canada. ian.shrier@mcgill.ca
Spine
|July 3, 2003
Summary
Trunk flexion isometric force and fatigue tests show low correlation. This suggests careful selection of assessment methods is needed for accurate trunk flexion fitness evaluation.
Area of Science:
- Biomechanics
- Exercise Physiology
- Sports Science
Background:
- Trunk flexion force and fatigue are common measures of trunk flexion fitness.
- The validity of using a single test depends on high correlations between different assessment methods.
Purpose of the Study:
- To compare intraindividual differences between trunk flexion isometric force, isometric fatigue, and dynamic fatigue.
- To determine the correlation between different measures of trunk muscle function.
Main Methods:
- A quasi-experimental study involving healthy secondary school students.
- Measurement of isometric force, isometric fatigue (time to task failure), and dynamic fatigue (sit-ups in 2 minutes).
- Analysis controlled for upper body mass and included gender as a variable.
Main Results:
- Low adjusted R-squared values were found between isometric force and fatigue measures (0.34 for isometric, 0.31 for dynamic).
- Correlation between dynamic fatigue and isometric fatigue was also low (0.27).
- Inclusion of gender did not significantly alter the results.
Conclusions:
- A lack of high correlation exists between trunk flexion isometric fatigue, dynamic fatigue, and isometric force.
- Healthcare professionals should exercise caution when selecting trunk flexion assessment tests.
- The choice of test should align with specific clinical needs or research questions.