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Reliability and Factorial Validity of Squat and Countermovement Jump Tests

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Randomized trial assesses the reliability of SJ and CMJ tests in physical education students, suggesting effectiveness for measuring explosive power.

This study aims to evaluate the reliability and factorial validity of squat and countermovement jump tests while comparing methods for estimating vertical jump height.
Evaluated 7 explosive power tests among 93 physical education students.
Analyzed reliability using Cronbach's alpha and within-subject variation (CV).
Conducted factor analysis to determine the principal components related to jump performance.
Squat jump (SJ) and countermovement jump (CMJ) tests showed the highest reliability (Cronbach's alpha 0.97-0.98).
Factor analysis revealed one significant component explaining 66.43% variance, correlating with explosive power (r = 0.76-0.87).
CMJ demonstrated the strongest relationship with explosive power (r = 0.87), indicating its factorial validity.

Marković et al. (2004) studied this question.

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Randomized trial assesses the reliability of SJ and CMJ tests in physical education students, suggesting effectiveness for measuring explosive power.