Validity and Reliability of the MyJump 2 Application for Measuring Vertical Jump in Youth Soccer Players Across Age Groups
The aim of this study was to assess the validity and intra-session reliability of the MyJump 2 smartphone application for evaluating countermovement jump (CMJ) and squat jump (SJ) performance in youth soccer players using the Chronojump contact mat system as a reference. Twenty-one male soccer playe...
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2025-06-01
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| author | Andreas Stafylidis Yiannis Michailidis Athanasios Mandroukas Ioannis Metaxas Konstantinos Chatzinikolaou Charalampos Stafylidis Sophia D. Papadopoulou Thomas I. Metaxas |
| author_facet | Andreas Stafylidis Yiannis Michailidis Athanasios Mandroukas Ioannis Metaxas Konstantinos Chatzinikolaou Charalampos Stafylidis Sophia D. Papadopoulou Thomas I. Metaxas |
| author_sort | Andreas Stafylidis |
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| description | The aim of this study was to assess the validity and intra-session reliability of the MyJump 2 smartphone application for evaluating countermovement jump (CMJ) and squat jump (SJ) performance in youth soccer players using the Chronojump contact mat system as a reference. Twenty-one male soccer players from an elite team (U14–U19) were randomly selected to participate in countermovement jump (CMJ) and squat jump (SJ) assessments, with jump heights recorded simultaneously by both systems. Validity was examined through Bland–Altman analysis, Pearson and Spearman correlations and linear regression. Reliability was assessed using intraclass correlation coefficients (ICC), standard error of measurement (SEM) and Bland–Altman test–retest analysis. Results revealed minor systematic overestimation by MyJump 2 (+0.943 cm for CMJ; +1.042 cm for SJ). Strong correlations were found between MyJump 2 and Chronojump (r = 0.972 for CMJ; r = 0.955 for SJ), while ICCs exceeded 0.97 for both jump types, indicating excellent reliability. These findings support MyJump 2 as a valid and reliable alternative for vertical jump testing in adolescent and junior soccer players as an accessible and suitable tool for field-based performance monitoring regarding vertical jumping ability. |
| format | Article |
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| issn | 2076-3417 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | MDPI AG |
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| spelling | doaj-art-a97ead9992f14ff98c5ec6bfe44a3bde2025-08-20T02:32:57ZengMDPI AGApplied Sciences2076-34172025-06-011511625310.3390/app15116253Validity and Reliability of the MyJump 2 Application for Measuring Vertical Jump in Youth Soccer Players Across Age GroupsAndreas Stafylidis0Yiannis Michailidis1Athanasios Mandroukas2Ioannis Metaxas3Konstantinos Chatzinikolaou4Charalampos Stafylidis5Sophia D. Papadopoulou6Thomas I. Metaxas7Laboratory of Evaluation of Human Biological Performance, Department of Physical Education and Sports Sciences, Aristotle University of Thessaloniki, University Campus of Thermi, 57001 Thessaloniki, GreeceLaboratory of Evaluation of Human Biological Performance, Department of Physical Education and Sports Sciences, Aristotle University of Thessaloniki, University Campus of Thermi, 57001 Thessaloniki, GreeceLaboratory of Evaluation of Human Biological Performance, Department of Physical Education and Sports Sciences, Aristotle University of Thessaloniki, University Campus of Thermi, 57001 Thessaloniki, GreeceLaboratory of Evaluation of Human Biological Performance, Department of Physical Education and Sports Sciences, Aristotle University of Thessaloniki, University Campus of Thermi, 57001 Thessaloniki, GreeceLaboratory of Motor Behavior and Adapted Physical Activity, Department of Physical Education & Sport Science, Aristotle University of Thessaloniki, 57001 Thessaloniki, GreeceDepartment of Physical Education and Sports Sciences, Democritus University of Thrace, 69100 Komotini, GreeceLaboratory of Evaluation of Human Biological Performance, Department of Physical Education and Sports Sciences, Aristotle University of Thessaloniki, University Campus of Thermi, 57001 Thessaloniki, GreeceLaboratory of Evaluation of Human Biological Performance, Department of Physical Education and Sports Sciences, Aristotle University of Thessaloniki, University Campus of Thermi, 57001 Thessaloniki, GreeceThe aim of this study was to assess the validity and intra-session reliability of the MyJump 2 smartphone application for evaluating countermovement jump (CMJ) and squat jump (SJ) performance in youth soccer players using the Chronojump contact mat system as a reference. Twenty-one male soccer players from an elite team (U14–U19) were randomly selected to participate in countermovement jump (CMJ) and squat jump (SJ) assessments, with jump heights recorded simultaneously by both systems. Validity was examined through Bland–Altman analysis, Pearson and Spearman correlations and linear regression. Reliability was assessed using intraclass correlation coefficients (ICC), standard error of measurement (SEM) and Bland–Altman test–retest analysis. Results revealed minor systematic overestimation by MyJump 2 (+0.943 cm for CMJ; +1.042 cm for SJ). Strong correlations were found between MyJump 2 and Chronojump (r = 0.972 for CMJ; r = 0.955 for SJ), while ICCs exceeded 0.97 for both jump types, indicating excellent reliability. These findings support MyJump 2 as a valid and reliable alternative for vertical jump testing in adolescent and junior soccer players as an accessible and suitable tool for field-based performance monitoring regarding vertical jumping ability.https://www.mdpi.com/2076-3417/15/11/6253MyJump 2vertical jumpcountermovement jump (CMJ)squat jump (SJ)validityreliability |
| spellingShingle | Andreas Stafylidis Yiannis Michailidis Athanasios Mandroukas Ioannis Metaxas Konstantinos Chatzinikolaou Charalampos Stafylidis Sophia D. Papadopoulou Thomas I. Metaxas Validity and Reliability of the MyJump 2 Application for Measuring Vertical Jump in Youth Soccer Players Across Age Groups Applied Sciences MyJump 2 vertical jump countermovement jump (CMJ) squat jump (SJ) validity reliability |
| title | Validity and Reliability of the MyJump 2 Application for Measuring Vertical Jump in Youth Soccer Players Across Age Groups |
| title_full | Validity and Reliability of the MyJump 2 Application for Measuring Vertical Jump in Youth Soccer Players Across Age Groups |
| title_fullStr | Validity and Reliability of the MyJump 2 Application for Measuring Vertical Jump in Youth Soccer Players Across Age Groups |
| title_full_unstemmed | Validity and Reliability of the MyJump 2 Application for Measuring Vertical Jump in Youth Soccer Players Across Age Groups |
| title_short | Validity and Reliability of the MyJump 2 Application for Measuring Vertical Jump in Youth Soccer Players Across Age Groups |
| title_sort | validity and reliability of the myjump 2 application for measuring vertical jump in youth soccer players across age groups |
| topic | MyJump 2 vertical jump countermovement jump (CMJ) squat jump (SJ) validity reliability |
| url | https://www.mdpi.com/2076-3417/15/11/6253 |
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