A field-test battery for elite, young soccer players.

The validity and reliability of a battery of field-based performance tests was examined. The opinions of coaches, fitness professionals and players (n=170, 172 and 101 respectively) on the importance of performance testing were established using a questionnaire. On 2 occasions, separated by 7 days, 80 elite, young soccer players (mean��SD [and range]: age 13.2��2.6 [8.9-19.1] years; stature 1.59��0.18 m [1.32-1.91]; body mass 50.6��17.1 [26.5-88.7] kg) completed a battery of field-based tests comprised of heart rate response to a submaximal Multi-stage fitness test, 3 types of vertical jump, sprints over 10 and 20 m, and an agility test. Physical performance testing was considered important by coaches (97%), fitness professionals (94%) and players (83%). The systematic bias ratio and the random error components of the 95% ratio limits of agreement for the first and second tests, for the U9-U11 vs. U12-U14 vs. U15-U18 age groups, were [Systematic bias (*/�� ratio limits)]: Heart rate (Level 5): 0.983 (*/�� 1.044) vs. 0.969 (*/�� 1.056) vs. 0.983 (*/�� 1.055); Rocket jump: 0998 (*/�� 1.112) vs. 0.999 (*/�� 1.106) vs. 0.996 (*/�� 1.093); 10 m sprint: 0.997 (*/�� 1.038) vs. 0.994 (*/�� 1.033) vs. 0.994 (*/�� 1.038); Agility test: 1.010 (*/��1.050) vs. 1.014 (*/��1.050) vs. 1.002 (*/��1.053). All tests, except heart rate recovery from the Multi-stage fitness test, were able to distinguish between different ability and age groups of players (p