Iran Medical Council Journal of Iranian Medical Council 2645-338X 8 2 2025 04 01 The Effectiveness of Volleyball Exercises on Cognitive Function and Daily Living Skills in Patients with Schizophrenia: A Randomized Clinical Trial 294 306 214690 10.18502/jimc.v8i2.17701 EN Maryam Khazaei Poul Department of Occupational Therapy, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran Parvin Raji Department of Occupational Therapy, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran Mohammadreza Gharib Dr Gharib Comprehensive Rehabilitation Center of Chronic Psychiatric Patients Nowshahr, Mazandaran, Iran Elham Faghihzadeh Department of Biostatistics and Epidemiology, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran 0000-0002-9128-2685 Journal Article 2024 04 02 <strong>Background: </strong>This study aimed to investigate the effectiveness of volleyball exercises on executive function and daily living skills in schizophrenia. <br><strong>Methods: </strong>In this randomized study, 28 individuals with schizophrenia participated. The intervention was volleyball exercises for two months. The Functional Independence Measure, The Lawton instrumental activities of daily living scale‏, and Loewenstein Occupational Therapy Cognitive Assessment battery tests were used in this study. Repeated measures and effect size were utilized for analysis. <br><strong>Results:</strong> Volleyball exercises improve cognitive function and Activities of Daily Living (ADLs) in the intervention group in the following: group effect, time effect, and group and time interaction. They were significant respectively (p-value1=0.041, p-value2=0.001, p-value3=0.001, Cohen’s d=1.267,1.266), (p-value1=0.001, p-value2=0.001, p-value3= 0.001, Cohen’s d=3.967,3.749). With this intervention, no significant difference was observed between the control and intervention groups in instrumental activities of daily Living.<br><strong>Conclusion:</strong> Volleyball exercises improve executive function and ADLs in individuals with schizophrenia.<br><br> https://www.jimc.ir/article_214690_bff6893e12b10e529807e069384dcbd2.pdf