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Reliability and validity of the five-repetition sit-to-stand test for children with cerebral palsy
Tze-Hsuan Wang1, Hua-Fang Liao, Yi-Chun Peng
1School and Graduate Institute of Physical Therapy, College of Medicine, National Taiwan University, Taiwan.
Insights
The five-repetition sit-to-stand test reliably measures functional strength in children with spastic diplegia. This test demonstrates good validity, making it suitable for clinical use in assessing muscle strength.
Area of Science:
- Pediatrics
- Rehabilitation Medicine
- Neurology
Background:
- Spastic diplegia is a common form of cerebral palsy affecting lower limb movement.
- Assessing functional strength is crucial for monitoring progress and guiding interventions in children with spastic diplegia.
- The five-repetition sit-to-stand test is a functional strength assessment tool.
Purpose of the Study:
- To evaluate the psychometric properties of the five-repetition sit-to-stand test.
- To determine the reliability and validity of this test in children diagnosed with spastic diplegia.
Main Methods:
- A methodology study involving 108 children with spastic diplegia and 62 typically developing children (aged 5-12 years).
- Test-retest reliability was assessed in 22 children with spastic diplegia within one week.
- Convergent and known-group validity were examined using correlations with other strength and function measures.
Main Results:
- Excellent intra-session (ICC=0.95) and test-retest (ICC=0.99) reliability were observed.
- The test showed strong convergent validity with measures of muscle strength and motor function (r or rho = 0.40-0.78).
- Known-group validity was supported, with typically developing children and those with lower Gross Motor Function Classification System levels demonstrating higher performance.
Conclusions:
- The five-repetition sit-to-stand test is a reliable and valid measure of functional muscle strength.
- This test is appropriate for use in clinical settings to assess children with spastic diplegia.
Unlabelled:
OBJECTIVE To investigate the psychometric properties of the five-repetition sit-to-stand test, a functional strength test, in children with spastic diplegia.
Design:
Methodology study.
Settings:
Hospital, laboratory or home.
Participants:
In total, 108 children with spastic diplegia and 62 with typical development aged from five to 12 years were tested. For test-retest reliability, 22 children with spastic diplegia were tested twice within one week.
Interventions:
Not applicable.
Main Measures:
The five-repetition sit-to-stand test measures time needed to complete five consecutive sit-to-stand cycles as quickly as possible. The higher the rate of five-repetition sit-to-stand (repetitions per second), the more strength a person has.
Results:
The intraclass correlation coefficients of intra-session reliability and test-retest reliability were 0.95 and 0.99 respectively. The minimal detectable difference was 0.06 rep/sec. The convergent validity of the five-repetition sit-to-stand test was supported by significant correlation with one-repetition maximum of the loaded sit-to-stand test, isometric muscle strength, scores of Gross Motor Function Measure, and gait function (r or rho = 0.40-0.78). For known group validity, children with typical development and children classified as Gross Motor Function Classification System level I performed higher rates of five-repetition sit-to-stand than children classified as level II, and children classified as level II performed higher rates than level III.
Conclusion:
The five-repetition sit-to-stand test was a reliable and valid test to measure functional muscle strength in children with spastic diplegia in clinics.
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