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Jamie B. Barker and Marc V. Jones

This study reports the effects of a hypnosis intervention on a professional soccer player who reported low self-efficacy and a negative mood state relative to his soccer performance. Pre- and postintervention data were collected via a Soccer Self-Efficacy Questionnaire (SSEQ) that consisted of 10 items relating to good soccer performance, the Trait Sport Confidence Inventory (TSCI), the Positive and Negative Affect Schedule (PANAS), and a Soccer Performance Measure (SPM). An intervention program consisting of eight hypnosis sessions was conducted. These sessions comprised the presentation of ego-strengthening suggestions. Both visual and statistical analysis revealed substantial increases in trait sport confidence, self-efficacy, positive affect, and soccer performance, as well as a substantial decrease in negative affect over the course of the intervention. The findings of this case study suggest that hypnosis can be used to enhance self-efficacy, affect, and sport performance. A number of practical issues are presented surrounding the use of hypnosis in the context of English soccer and with athletes in general.

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Andrew G. Wood, Jamie B. Barker, Martin Turner, and Peter Thomson

seen in single-case designs ( Barker et al., 2013 ). To explore the magnitude of the intervention effectiveness, effect sizes were calculated and interpreted using guidelines and classification of Cohen’s d ( 1988 ), specifically, where M 1 − M 2 indicates the difference between mean group scores

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Iva Obrusnikova, Haley M. Novak, and Albert R. Cavalier

). Optimizing behavioral health interventions with single-case designs: From development to dissemination . Translational Behavioral Medicine, 4 ( 3 ), 290 – 303 . PubMed ID: 25264468 doi:10.1007/s13142-014-0258-z Doyle , P.M. , Wolery , M. , Ault , M.J. , & Gast , D.L. ( 1988 ). System of least

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Karin Moesch, Andreas Ivarsson, and Urban Johnson

.2307/3090197 Kratochwill , T. , Hitchcock , J. , Horner , R. , Levin , J.R. , Odom , S. , Rindskopf , D. , & Shadish , W. ( 2010 ). Single-case designs technical documentation . What Works Clearinghouse . Retrieved from Kroenke , K

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Paul R. Ashbrook, Andrew Gillham, and Douglas Barba

-case research designs: Methods for clinical and applied settings ( 2nd ed. ). New York, NY : Oxford University Press . Kratochwill , T.R. , Hitchcock , J. , Horner , R.H. , Levin , J.R. , Odom , S.L. , Rindskopf , D.M. , & Shadish , W.R. ( 2010 ). Single-case designs technical documentation