A one-season study of 58 male Norwegian academy players aged 12 to 19 found clinically diagnosed lower-limb apophyseal injuries in 12% of players in an average week, at 4.6 per 1,000 hours of exposure. Pubic apophysitis was the most common (32% of cases), and 77% of injuries had a gradual onset, with 81% starting during or just after training.
A small study of 15 male players aged 10-11 found that after about 14 hours without food or fluid, Yo-Yo intermittent recovery distance was significantly lower than when fed, while jump, 30-m sprint and agility times did not differ. Fasted players also had higher resting heart rate, fatigue and perceived exertion, and shorter sleep.
A questionnaire study of 735 children aged 7 to 15 at a Medical University of Warsaw dental clinic found 42.9% had a parent-reported history of traumatic dental injury, rising to 49.7% among those playing sports versus 31.3% among non-participants. Football participation, rural residence and lower parental education were also linked to higher reported injury. Clinic-based sampling means the figures are not population estimates.
Researchers at Nationwide Children's Hospital found that youth aged 11 to 17 who averaged about 141 minutes of screen time a day in the first three days after a concussion recovered 35% faster than those with 260 minutes. Two hours a day of smartphone or TV use was linked to quicker recovery; computer, tablet and gaming use was not.
