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Objective As computerized cognitive testing becomes increasingly popular in clinical and research settings, conducting studies on efficacy and psychometric properties is essential. One such program is RC21X, a web-based brain performance measurement tool. Based on empirically supported neurocognitive and neuromotor tasks, the 12-min test consists of 15 modules measuring memory, motor coordination, processing speed, and executive functioning. Because individuals may use RC21X repeatedly to track changes in cognitive performance, establishing reliability of the program is imperative. The current study examined test–retest reliability of RC21X within a 2-week period. Method The sample consisted of 222 individuals: 192 (86.5%) were male, and 30 (13.5%) were female. Average age was 44.06 years (SD = 17.76), with ages ranging from 7 to 82 years. We computed Pearson’s correlation coefficients for module and composite scores to determine reliability between performance at times 1 and 2. Results All correlations were statistically significant (p < .001). The 2-week test–retest reliability for composite score was 0.72, with subtest coefficients ranging from 0.54 on an auditory memory recognition task to 0.89 on a finger tapping task. We replicated these analyses with participants’ (n = 43) test sessions 3 and 4; we found similar results to those from test 1 and test 2 analyses, suggesting stability of results over multiple administrations. Conclusions Results for RC21X were comparable to existing literature that supports moderate to high reliability of other computer-based tests. Although future research needs to investigate validity of RC21X, our findings support potential applications in research, clinical use, and personal brain performance measurement.

Various methods are used to measure hip and knee joint motion angles; however, their use is often limited by cost or inability to measure dynamic movements. The assessment of movement patterns is clinically useful in individuals with osteoporosis (OP) and osteopenia (OPe) through its potential to optimize fracture risk assessment. This study evaluates the inter-rater reliability of using Dartfish 2-D Motion Analysis Software to measure maximum flexion and extension angles at the hip and knee in individuals with OP or OPe while performing five tasks of the Safe Functional Motion test. Twelve participants were videotaped performing the pour, footwear, newspaper, sweep, and sit-to-floor tasks. Five raters used Dartfish to analyze maximum flexion and extension angles at the hip and knee, and an intra-class correlation coefficients (ICC) and SEM were calculated for each measurement. In all five tasks, ICC and SEM values ranged from 0.23 to 0.95, and 1.75 to 11.54 degrees, respectively, with maximum knee flexion angles generally having higher ICC, and lower SEM point estimates. The results indicate that Dartfish measurements of maximum knee flexion angles in uniplanar tasks demonstrate a moderate to excellent degree of inter-rater reliability, while measurements at the hip joint should be used with caution. Given that the results of this study display moderate to excellent reliability, they lay the groundwork for future research aimed at determining the validity of these measurements. Such research would help to further develop the base of evidence surrounding the usefulness of Dartfish Motion Analysis in fracture risk analysis among individuals with OP.