Test-retest Reliability and Influence of Visual Constraint During Two Novel Reactive-agility Tasks
Context: Patients continue to report high-reinjury rates, low rates of return to sport (RTS), and poor long-term function, with only 44-55% of athletes reaching full return to competitive sports. RTS tests inadvertently fail to consider the complex dynamics of sport (e.g. reactive and cognitive-motor demands associated with rapidly changing environment), which may threaten their utility in preventing subsequent injury. Objective: To establish within and between session test-retest reliability of two novel reactive agility tasks (Aim 1) and to assess the influence of a challenging visual constraint (e.g. stroboscopic visual field disruption) on participants' reaction time, time to target, total targets achieved and time to completion (Aim 2) Design: Descriptive case series with a test-retest design. Participants: Three healthy, physically active participants (Male n = 1 Female n = 2) aged 18-30 years old participated. Intervention: Participants completed two novel reactive agility tasks in a randomized order. Each participant completed 2 sessions approximately 7 days apart. Each session consisted of two sub-sessions that were identical excluding task order randomization and the addition of stroboscopic glasses during session 2b. After each task the participants completed the NASA-TLX survey. Main Outcome Measures: Task 1 outcomes included: Average Reaction Time (seconds), Average Time To Target (seconds), Number of Target Deactivations (n = #) Task 2 outcomes included: Average Time To Target (seconds), Number of Target Deactivations (n = #), Time to Completion (seconds). The NASA-TLX survey results were included as a secondary outcome measure for both tasks. Results: Overall, the ICC values for within and between session reliability of reaction time were moderate to weak and with wide confidence intervals (within: ICC = 0.782, 95% CI .000-.994, between: ICC = 0.318, 95% CI .000-.975). ICC values for time to completion, time to target and number of target deactivations within and between session reliability were moderate-excellent but with wide confidence intervals. The strobe condition did not impact reaction time but did seem to impact pursuit of target. Conclusion: Reaction time was not a reliable measure in this study. Time to target, time to completion and number of target deactivations had moderate-excellent reliability.