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Reliability and criterion-related validity of the 20-yard shuttle test in competitive junior tennis players
Rehab City Östermalm, Stockholms läns landsting.
Department of environmental Medicine,Musculoskeletal and Sportsinjury epidemiologycenter, Karolinska institutet, Stockholm.
Linköping University, Department of Medical and Health Sciences, Division of Physiotherapy. Linköping University, Faculty of Medicine and Health Sciences. Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
2015 (English)In: Open Access Journal of Sports Medicine, ISSN 1179-1543, E-ISSN 1179-1543, Vol. 6, 269-276 p.Article in journal (Refereed) Published
Abstract [en]

PURPOSE: This study adds to the previous work in the field of sport-specific fitness testing by evaluating a tennis-specific agility test called "the 20-yard shuttle test". The aim of the study was to evaluate the test-retest reliability, the inter-rater reliability, and the criterion-related validity of the 20-yard shuttle test on competitive junior tennis players.

PARTICIPANTS AND METHODS: Totally, 34 Swedish tennis players (13 girls), mean age 14±1.6 years, participated in the study. To examine test-retest reliability, the subjects performed the 20-yard shuttle test three times on the same day and then the same procedure was repeated after 3 days. To test the inter-rater reliability, the time was measured with a stopwatch simultaneously by two different raters. The time recorded manually was compared to the gold standard of digital timing to evaluate the criterion-related validity.

RESULTS: Excellent test-retest reliability was found both within the same day (intraclass correlation coefficient [ICC] 0.95) and between days (ICC 0.91). Furthermore, the results showed excellent inter-rater reliability (ICC 0.99) and criterion-related validity on both test occasions (ICC 0.99).

CONCLUSION: We have provided introductory support for the 20-yard shuttle test as a reliable and valid test for use in competitive junior tennis players. The ease of administration makes this test a practical alternative to evaluate physical fitness in order to optimally train the athletes.

Place, publisher, year, edition, pages
2015. Vol. 6, 269-276 p.
Keyword [en]
agility; performance; physical fitness; physiotherapy
National Category
URN: urn:nbn:se:liu:diva-126473DOI: 10.2147/OAJSM.S86442PubMedID: 26316829OAI: diva2:915046
Available from: 2016-03-29 Created: 2016-03-29 Last updated: 2016-04-20

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