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Charlie Craig, whose father Nick Craig is a retired professional cyclist, was chosen to take part in an elite training programme after his potential was spotted by British Cycling chiefs.
But an expert cardiologist told a coroner he believed huge surges in adrenaline during intense training was likely to have caused the superfit schoolboy to have suffered a series of heart attacks.
Youngster - Symptoms - Problems
But no-one - not even the youngster - suspected he was dangerously unwell because the 15-year-old showed no obvious symptoms of coronary problems.
The attacks left his heart so damaged that one night he went to bed and never woke up after it stopped beating.
Son - Rider - Charlie - Likes - Olympic
The son of a retired professional rider, Charlie dreamed of following the likes of Olympic stars Sir Bradley Wiggins and Chris Froome to reach the top in the sport.
But South Manchester Coroner's Court was told the dedicated athlete was found dead in his bed by his mother who thought he was just having a lie-in.
Father - Nick - Heart - Problems - Charlie
Despite his father Nick's own heart problems Charlie never underwent the same tests as his older brother Tom, who was also an elite Team GB cyclist, because he was deemed too young.
Charlie from Hayfield, Derbyshire, was a rider with the British Cycling Team's Rider Route apprenticeship scheme and was highly regarded within the sport.
Programme - Cyclists - Stars - World - Olympic
The programme helps the most promising cyclists become the stars of world and Olympic cycling.
The court was told that on 20 January last year Charlie went to bed as normal, but tragically never woke up.
Passion - Cycling - Family - Father - Nick
His passion for cycling was shared by his family. As well as his father Nick's career in the sport, his brother Tom is a former national junior cyclo-cross champion.
His father told the coroner his son developed his own training programme, with their help. As well as cycling he worked on his core strength and enjoyed yoga.
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