Purpose: To assess the training load, energy expenditure, dietary intake, and sleep quality and quantity of junior tennis players during a tennis training camp. Methods: Ten junior academy tennis players (14 [1] y) completed a 6-day camp with daily morning and afternoon training. Players wore accelerometer watches to measure activity energy expenditure and sleep. Global positioning system units were worn to monitor external training load (distance covered, maximum velocity, and PlayerLoad^™). Dietary intake was obtained from a food diary and supplementary food photography. Results: Players covered significantly more distance and had higher PlayerLoad^™ during morning sessions than afternoon sessions (5370 [505] m vs 4726 [697] m, P < .005, d = 3.2; 725 [109] a.u. vs 588 [96] a.u., P < .005, d = 4.0). Players also ran further (5624 [897] m vs 4933 [343] m, P < .05, d = 1.0) and reached higher maximum velocities (5.17 [0.44] m·s⁻¹ vs 4.94 [0.39] m·s⁻¹, P < .05, d = 0.3) during simulated match play compared with drill sessions. Mean daily energy expenditure was 3959 (630) kcal. Mean energy intake was 2526 (183) kcal, resulting in mean energy deficits of 1433 (683) kcal. Players obtained an average of 6.9 (0.8) hours of sleep and recorded 28 (7) nightly awakenings. Conclusions: Junior academy tennis players failed to achieve energy balance and recorded suboptimal sleep quantity and quality throughout the training camp.

目的：评估网球训练营期间青少年网球运动员的训练负荷、能量消耗、饮食摄入以及睡眠质量和数量。方法：十名青少年网球运动员（14 [1] y）完成了为期 6 天的训练营，每天上午和下午进行训练。玩家佩戴加速度计手表来测量活动能量消耗和睡眠。佩戴全球定位系统单元以监测外部训练负荷（覆盖距离、最大速度和 PlayerLoad ^™）。膳食摄入量来自食物日记和补充食物摄影。结果:球员跑的距离明显更长，PlayerLoad ^™更高上午课程比下午课程（5370 [505] m vs 4726 [697] m，P  < .005，d  = 3.2；725 [109] au vs 588 [96] au，P  < .005，d  = 4.0）。球员也跑得更远（5624 [897] m vs 4933 [343] m，P  < .05，d  = 1.0）并达到更高的最大速度（5.17 [0.44] m·s ^-1 vs 4.94 [0.39] m·s ^{- 1} , P  < .05, d = 0.3) 在模拟比洞赛中与训练课相比。平均每日能量消耗为 3959 (630) kcal。平均能量摄入为 2526 (183) kcal，导致平均能量不足 1433 (683) kcal。玩家平均获得了 6.9 (0.8) 小时的睡眠时间并记录了 28 (7) 次夜间觉醒。结论：青少年网球运动员未能达到能量平衡，并且在整个训练营中记录了次优的睡眠数量和质量。