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Validity of the 30-15 Intermittent Fitness Test in Subelite Female Athletes

Bruce, Lyndell M.1; Moule, Simon J.1,2

Journal of Strength and Conditioning Research: November 2017 - Volume 31 - Issue 11 - p 3077–3082
doi: 10.1519/JSC.0000000000001775
Original Research

Bruce, LM and Moule, SJ. Validity of the 30-15 intermittent fitness test in subelite female athletes. J Strength Cond Res 31(11): 3077–3082, 2017—The purpose of this study was to assess the suitability of the 30-15 Intermittent Fitness Test (IFT) as a test in netball using female athletes. Twenty-six female subelite netballers (mean age = 19.7 ± 4.6 years, mean height = 176.0 ± 6.1 cm, mean body mass = 69.7 ± 9.3 kg) completed the yo-yo intermittent recovery test level 1 (yo-yo IRT1) and the 30-15 IFT. Participants performed both assessments 1 week apart before the intervention and both tests 1 week apart after the training intervention (for a total of 4 testing sessions). A 6-week training intervention occurred between the test occasions. Pearson's correlations revealed significant very strong relationships between the 30-15 IFT and yo-yo IRT on both test occasions (test occasion 1: r = 0.71, p = 0.003 [95% confidence interval {CI} 0.35–0.89], magnitude of effect, most likely; test occasion 2: r = 0.72, p = 0.001 [95% CI: 0.42–0.88], magnitude of effect, most likely). Repeated-measures analysis of variances examining the effect of position on performance changes revealed main effects for test occasion and a position × test occasion interaction for both the 30-15 IFT and the yo-yo IRT1 (30-15 IFT: test occasion [F(1,14) = 28.68, p = 0.001, ηp2 = 0.67], position × test occasion interaction [F(2,14) = 9.38, p = 0.003, ηp2 = 0.57]; yo-yo IRT1: test occasion [F(1,15) = 11.72, p = 0.004, ηp2 = 0.44], position × test occasion interaction [F(2,15) = 9.96, p = 0.002, ηp2 = 0.57]). Results show that the 30-15 IFT is a suitable test for female netballers as it was able to detect improvements in performance after a training intervention, in addition to having a very strong significant relationship with the yo-yo IRT1.

1Exercise Science, RMIT University, Melbourne, Australia; and

2Boroondara Express Netball Club, Victorian Netball League, RMIT University, Melbourne, Australia

Address correspondence to Lyndell Bruce,

Copyright © 2017 by the National Strength & Conditioning Association.