Reliability of the 30-15 intermittent fitness test in semiprofessional soccer players

Thomas, C; Dos’Santos, T; Jones, PA; Comfort, P

Abstract

Purpose: The purpose of this investigation was to determine the reliability of the 30-15 Intermittent Fitness Test (30-15IFT) in semiprofessional soccer players. Methods: Fourteen male semiprofessional soccer players performed the 30-15IFT on 2 occasions separated by 7 d. Reliability was assessed by intraclass correlation coefficient (ICC), typical error of measurement expressed as a coefficient of variation (CV), and smallest worthwhile change (SWC) to determine any significant difference between testing sessions. Results: Maximal intermittent running velocity (VIFT) demonstrated good reliability (ICC = .80) for between-sessions reliability. The CV was 2.5% for between-sessions reliability of the 30-15IFT. As the SWC (0.70 km/h) falls within the range in which the individual’s true score is likely to lie (1.0 km/h), the usefulness of the VIFT was rated as marginal. Despite the usefulness of the 30-15IFT being deemed marginal, a change in performance as small as 1.0 km/h (2 stages) in VIFT could be considered substantial or real. Conclusion: This study demonstrates that VIFT in the 30-15IFT is reliable, resulting in a reliable assessment of team-sport-specific cardiorespiratory fitness, with changes as small as 1.0 km/h (2 stages) in VIFT considered meaningful.

Citation

Thomas, C., Dos’Santos, T., Jones, P., & Comfort, P. (2016). Reliability of the 30-15 intermittent fitness test in semiprofessional soccer players. International Journal of Sports Physiology and Performance, 11(2), 172-175. https://doi.org/10.1123/ijspp.2015-0056

• Journal Article Type: Article
• Publication Date: Mar 1, 2016
• Deposit Date: Mar 18, 2016
• Journal: International Journal of Sports Physiology and Performance
• Print ISSN: 1555-0265
• Publisher: Human Kinetics
• Volume: 11
• Issue: 2
• Pages: 172-175
• DOI: https://doi.org/10.1123/ijspp.2015-0056
• Publisher URL: http://dx.doi.org/10.1123/ijspp.2015-0056
• Related Public URLs: http://journals.humankinetics.com/ijspp