Could persistent pain near a joint in a young athlete be a growth-plate injury?

Yes. Before skeletal maturity, growth plates are vulnerable to twisting, impact, and repeated loading. Persistent local tenderness, swelling, limping, or declining sports performance should prompt a pause from the provoking activity and medical assessment, because an untreated injury can affect bone growth and joint shape.

Should an adolescent stop training because of heel pain during sport?

Heel pain during growth can result from repeated traction at the calcaneal growth plate. Running and jumping should be reduced and the child assessed if pain causes a limp or affects daily activity.

Can insufficient sleep increase sports injury risk and slow recovery?

Insufficient sleep can reduce reaction speed, attention, and movement control and can interfere with muscle repair, pain regulation, and recovery after training. Athletes should keep a regular schedule and allow enough sleep for their training load. Persistent insomnia, marked daytime sleepiness, or snoring with pauses in breathing warrants assessment.