Reliability and Validity of the 30-15 Intermittent Field Test With and Without a Soccer Ball.

: The purpose of this study was to examine the reliability and validity of the 30-15 Intermittent Field Test (30-15) with and without a ball. : Twenty-four collegiate female soccer players (19.46 ± 1.22 years; 167.01 ± 7.23 cm; 60.95 ± 7.84 kg) performed 1 trial of the Yo-Yo Intermittent Recovery (YYIR) test, 3 trials of the 30-15, and 3 trials of the 30-15 with a ball (30-15), separated by a minimum 48 hours. Maximal intermittent running velocity (V), heart rate at exhaustion (HR), and rating of perceived exertion (RPE) were collected. : Intraclass correlation coefficients (ICCs) between trials demonstrated good reliability during the 30-15 in V (ICC = 0.88) and HR (ICC = 0.89), in addition to the 30-15 V (ICC = 0.83) and HR (ICC = 0.87). V was significantly reduced in 30-15 (15.82 km h) compared to 30-15 (17.52 km h; < .001), regardless of trial. HR and RPE were significantly greater in 30-15 compared to 30-15 ( < .05). Estimated maximal oxygen consumption (VOmax) YYIR and estimated VOmax of 30-15 and 30-15 was very strongly ( = 0.82) and strongly ( = 0.68) correlated. : The 30-15 is considered valid and reliable and the 30-15 was reliable in female soccer players.