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666and time. 50 m, 100 m and 200 m individual short course best performances of the season, in the four swimming strokes, were used to compare with the ACV assessed. Pearson correlation coefficient was calculated and repeated measures t-test was applied (p≤0.05). RESULTS: ACV was correlated with the 50 m swimming event velocity in breaststroke (r=0.92), front crawl (r=0.85) and backstroke (r=0.85), and with the 100 m swimming event velocity in the same swimming strokes (breaststroke: r=0.90; front crawl: r=0.91; backstroke: r=0.86). Considering the 200 m swimming performance, relationships were found in front crawl (r=0.90) and in breaststroke (r=0.89). Differences between ACV and 50 m swimming performance were observed for all swimming strokes, and also in breaststroke, front crawl and backstroke for the 100 m swimming performance. However, when comparing ACV and the 200 m swimming event velocity, there were no differences, in the four swimming strokes. CONCLUSIONS:Linear relationships between ACV and performance in the 50 m and 100 m were found. Simultaneously, the 200 m swimming event velocity seems to be similar to ACV in the four swimming strokes. Therefore, these findings suggest that ACV could be an important parameter of monitoring and prescribing anaerobic training in young swimmers. PURPOSE:Considering young basketball players classified as injured or non-injured throughout a basketball season, the aim of the present study was to compare the initial growth, maturity status, body dimensions, maximal short-term performance, aerobic performance in young basketball players. METHODS:Sample of 50 under-16 basketball players (14.0 -16.0 years) was chosen from players that dispute the district championship and national cadet competition during the sports seasons 2007/08 and 2008/09. Data included chronological age (CA), skeletal age (SA) determined by the Fels method, years of

Objectives: To determine the test-retest reliability of the submaximal version of the Yo-Yo Intermittent Recovery Test-Level 1 (Yo-Yo IR1-sub), which is a valid aerobic assessment. Design: Test-re-test. Methods: Elite youth soccer players (n = 10, age: 18.8 ± 0.5 years, height: 181.1 ± 4.9 cm, body mass: 74.2 ± 7.6 Kg) completed the Yo-Yo IR1-sub on two consecutive weeks to determine the reliability of a non-exhaustive alternative to maximal aerobic testing. Relative and absolute reliability of the Yo-Yo IR1-sub was assessed for heart rate response and recovery metrics (HR6, HR30, HR60, HR90, HR120, HRR30, HRR60, HRR90 and HRR120). Results: The Yo-Yo IR1-sub was determined to be a reliable alternative to maximal testing, with the final heart rate at the end of the 6 minute test (HR6) shown to be the most reliable metric (ICC = 0.96; SDD = 5.4 bpm). The percentage of heart rate recovered after 2 min (HRR120) was the most reliable recovery metric (ICC = 0.93; SDD = 4.6%). Conclusion: If maximal testing is not a feasible option, particularly during the competitive season or during the rehabilitation of an injured player, then a submaximal test is a reliable alternative to monitor fitness in elite young soccer players, with HR6 and HRR120 being the most stable parameters. (Journal of Trainology 2017;6:31-34)

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