Significant Energy Deficit and Suboptimal Sleep During a Junior Academy Tennis Training Camp

James Fleming, Liam Corr, James Earle, Robert Naughton, Liam Harper

Research output: Contribution to journalArticlepeer-review


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 years) 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, max. velocity, PlayerLoadTM). Dietary intake was obtained from a food diary and supplementary food photography. Results: Players covered significantly more distance and had higher PlayerLoadTM during morning sessions than afternoon sessions (5370±505m vs 4726±697m, p<0.005, d=3.2; 725±109a.u. vs 588±96a.u., p<0.005, d=4.0). Players also ran further (5624±897m vs 4933±343m, p<0.05, d=1.0) and reached higher max velocities (5.17±0.44m·s-1 vs 4.94±0.39m·s-1, p<0.05, d=0.3) during simulated match play compared to drill sessions. Mean daily energy expenditure was 3959±630kcal. Mean energy intake was 2526±183kcal, resulting in mean energy deficits of 1433±683kcal. Players obtained an average of 6.9±0.8 hours sleep and recorded 28±7 nightly awakenings. Conclusions: Junior academy tennis players failed to achieve energy balance and recorded sub-optimal sleep quantity and quality throughout the training camp.
Original languageEnglish
JournalPediatric Exercise Science
Early online date8 Mar 2022
Publication statusE-pub ahead of print - 8 Mar 2022


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