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PURPOSE:  The aim of this study was to examine the reliability, validity and usefulness of the 30–15 IFT  in competitive female soccer players.   METHODS:  Seventeen elite female soccer players participated in the study. A within subject test-retest study design was utilized to assess the reliability of the 30–15 intermittent fitness test (IFT). Seven days prior to 30–15 IFT , subjects performed a continuous aerobic running test (CT) under laboratory conditions to assess the criterion validity of the 30–15 IFT . End running velocity (V CT  and V IFT ), peak heart rate (HRpeak) and maximal oxygen consumption (VO 2max ) were collected and/or estimated for both tests.   RESULTS:  V IFT  (ICC = 0.91; CV = 1.8%), HRpeak (ICC = 0.94; CV = 1.2%), and VO 2max  (ICC = 0.94; CV = 1.6%) obtained from the 30–15 IFT  were all deemed highly reliable ( p  > 0.05). Pearson product moment correlations between the CT and 30–15 IFT  for VO 2max , HRpeak and end running velocity were large ( r  = 0.67,  p  = 0.013), very large ( r  = 0.77,  p  = 0.02) and large ( r  = 0.57,  p  = 0.042), respectively.   CONCLUSION:  Current findings suggest that the 30–15 IFT  is a valid and reliable intermittent aerobic fitness test of elite female soccer players. The findings have also provided practitioners with evidence to support the accurate detection of meaningful individual changes in V IFT  of 0.5 km/h (1 stage) and HRpeak of 2 bpm. This information may assist coaches in monitoring “real” aerobic fitness changes to better inform training of female intermittent team sport athletes. Lastly, coaches could use the 30–15 IFT  as a practical alternative to laboratory based assessments to assess and monitor intermittent aerobic fitness changes in their athletes.

Reliability, Validity and Usefulness of 30–15 Intermittent Fitness Test in Female Soccer Players