This study explores the impact of app-based imagery and traditional methods (i.e., reflective diary) on cognitive-specific (CS) imagery in junior national squash athletes. A total of 75 participants (mean age = 15.22, SD = 2.14) without prior imagery training were allocated into app-based imagery (n = 25), reflective diary (n = 25), and control groups (n = 25). After an imagery workshop and a 12-week reinforcement, CS imagery scores were assessed pretest, post-test, and follow-up using the Sport Imagery Questionnaire (SIQ), as well as technical shot execution (i.e., drive, boast, dropshot, lob, and volley). Using one-way repeated measures analysis of variance and the Friedman test, we examined differences in CS imagery and technical skills across timepoints. The app-based group showed significant improvements in SIQ scores at post- (F(2,72) = 58.53, p < .001, η2 = 0.61) and follow-up tests (F(2,72) = 97.31, p < .001, η2 = 0.73), as well as in technical skills (drive, χ2(2) = 40.92, p < 0.001; boast, χ2(2) = 45.81, p < 0.001; dropshot, χ2(2) = 38.57, p < 0.001; lob, χ2(2) = 42.51, p < 0.001; volley, χ2(2) = 41.81, p < 0.001). A post-hoc analysis revealed that the app-based imagery group experienced the most substantial effect, surpassing reflective diary and control groups, indicating the effectiveness of app-based interventions in enhancing CS imagery and technical performance. The results demonstrate that mobile applications represent a practical and effective substitute for traditional imagery and mental skill reinforcement techniques, rendering these essential tools more accessible to athletes.
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