Ensuring reliability of measurement instruments in combat sports is crucial for coaches and researchers, promoting their widespread use. This study assessed the reliability of a procedure that measures kinetic and kinematic variables in karate athletes` roundhouse kicks. Twenty-four male karate athletes participated, performing three kicks initially and three 48 h later. Paired Student`s t-test found no significant differences between tests. Bland-Altman plot revealed few outliers. Strong agreement between test and retest was shown by Pearson correlations, Intraclass Correlation Coefficient (ICC), and Coefficient of Variation (CV) for impact force variables: r = 0.96; ICC = 0.93; CV = 0.12%, impulse: r = 0.95; ICC = 0.93; CV = 1.08%, attack time: r = 0.82; ICC = 0.70; CV = 0.14%, contact time: r = 0.72; ICC = 0.60; CV = 0.18%, return time: r = 0.80; ICC = 0.71; CV = 4.28%, and kick time: r = 0.84; ICC = 0.77; CV = 2.88%. No Smallest Worthwhile Changes (SWC) were observed, and Cronbach`s alpha indicated acceptable internal consistency. In conclusion, the procedure demonstrated reliability in terms of internal and measurement consistency, without random errors.
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