Objective: To establish the validity of a 15 m multistage shuttle run test (MSRT) as a predictor of anaerobic capacity (expressed as mean power output (MPO) from the 30 second Wingate anaerobic test (WAnT)) in female university standard games players. Methods: Data came from three phases using a total of 72 players (mean (SD) age 20.3 (1.5) years, body mass 64.9 (8.8) kg, and stature 1.67 (0.04) m). The repeatability of the MSRT was assessed in phase 1 by applying 95% limits of agreement (LoA) to the test and retest results from a random sample of 20 players. In phase 2, linear relations between MPO and performance on the MSRT were investigated in a random sample of 36 players. As a result, a calibration model (Y = a + bX) was developed and cross validated in phase 3, in which the remaining 36 players performed both the WAnT and the MSRT. Time (seconds) to volitional exhaustion/disqualification from the MSRT was substituted into the calibration model from which MPO was predicted. The agreement between MPO predicted and MPO measured from the WAnT was quantified using LoA. Results: Insignificant bias between repeat applications of the MSRT (mean diff (SD diff ) = 1.0 (3.5) seconds (4 (14) m), t = 1.23, p = 0.230) was found from phase 1. Data were homoscedastic (r = 0.061, p = 0.799) with LoA ¡ 6.9 seconds (¡ 27 m). In phase 2 the strongest correlation was between MPO (W/kg 0.67 ) and time to volitional exhaustion/disqualification on the MSRT; r = 0.715 (r 2 = 51.1%, p = 0.0005). As a result, the calibration model Conclusions:The MSRT requires minimal equipment and training of assessors, and it is easy to perform. In the population studied, it provides scores that are repeatable, and anaerobic capacity (MPO) can be successfully predicted from its performance. It would seem therefore to be a useful field based test for use by female games players, their coaches, and support scientists. I n the case of estimating the contribution of the aerobic component to athletic performance, procedures for the direct determination of maximal oxygen uptake, using incremental exercise tests to volitional exhaustion, and noninvasive methods to determine oxygen consumption are well established.1 These maximal oxygen uptake tests have long been considered the criterion gold standards against which to validate simple field tests of aerobic performance. [2][3][4] However, the ability to tolerate high rates of energy expenditure over time-a capacity for intense activity-is one of the most difficult components of athletic performance to objectively quantify. 5 6 In attempting to develop simple field tests of anaerobic capacity, scientists have struggled to agree on a criterion physiological test that will assess the anaerobic contribution to total energy supply. It is now generally considered that, ideally, needle biopsies (muscle metabolites) and arterial and venous cannulation (blood metabolites) should be used to assess the anaerobic energy supplied during short bouts of exercise.