Impact of a competition with two consecutive matches in a day on physical performance in young tennis players

The purpose of this study was to analyze the effects of playing 2 tennis matches on the same day on physical performance in young tennis players. Twelve well-trained young tennis players took part in a simulated tennis competition consisting of 2 tennis matches on the same day (morning and afternoon sessions). Before and the day after the competition, physical performance was measured using a battery of countermovement jumps; a 10 m sprint; the 5–0–5 agility test; hip, grip and shoulder maximal isometric strength; shoulder range of motion; and a serve velocity test. Postcompetition results showed reduced performance in 10 m (–3.3%, effect size (ES) = small), dominant and nondominant 5–0–5 agility test (–4.6%, ES = moderate; –4.2%, ES = moderate, respectively), bilateral (–5.2%, ES = small), and unilateral countermovement jumps (dominant leg: –7.2%, ES = small; non-dominant leg: –9.1%, ES = small). Both dominant and nondominant shoulder external rotation range of motion increased (12.2%, ES = moderate; 5.6...