This study aimed (a) to compare the physiological and performance responses in different repeated sprint tests (RSAtwo vs. RSAone) and (b) to determine the relationship between muscle strength and aerobic and anaerobic performance tests in young basketball players. Twenty-two (average age 16.5 ± 0.5 years) young basketball players underwent a series of physical tests: 2 different repeated sprint tests (RSAtwo vs. RSAone), isokinetic knee strength (extensors/flexors at 60° and 180°/s), Wingate anaerobic performance test (WaNT), 20-m shuttle run test (VO2max), jumping ability test and T-drill agility test. The results showed that except for the fatigue index, all performance responses in RSAtwo were significantly higher compared to the RSAone in terms of the best time, worst time, total time and step numbers (p<0.05). In addition, the RSAtwo had higher physiological responses in terms of heart rate, percentage of maximum heart rate, blood lactic acid and rating of perceived exertion levels than the RSAone. Moreover, performance determinants of two repeated sprint tests were significantly correlated with agility, estimated VO2max, jumping, anaerobic performance and isokinetic knee strength (ranging from - 0.47 to 0.73). Both repeated sprint tests can be used for basketball-specific aerobic endurance training. This study also suggests that the RSAtwo might be suitable for assessing repeated sprint capacity in basketball.

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