In a statement, posted on social media, The Tri Society said it was “deeply saddened” by the athlete’s death.
It said the man had been transferred to the Queen’s Medical Centre in Nottingham by event medical staff.
The statement said: “Our thoughts are with the athlete’s family, friends, and team-mates at this difficult time.”
The park, home to the National Water Sports Centre, hosted the Triathlon England National Club Relays Championships on Saturday.
British Triathlon, which ran the event, confirmed the athlete had been taking part and said its sympathies were with the man’s friends and family.
Fellow triathletes and clubs have also passed on their condolences on social media.
Police said a file would be prepared for the coroner.
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