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Four Otago Peninsula Challenge participants were airlifted to Dunedin Hospital in four separate incidents yesterday.
At 10.40am, the Otago Regional Rescue Helicopter was called to transport a 30-year-old male mountain biker with neck injuries to Dunedin Hospital, returning an hour later to airlift another mountain biker with suspected spinal injuries.
Another patient was taken to hospital at 12.20pm suffering dehydration, and another transported at 1.50pm with severe heat exhaustion after morning temperatures soared to record levels.
Otago Peninsula Challenge organiser Peter Notman said he did not have the full details of how the injuries occurred, but understood the mountain bikers were taken to hospital as a precaution.
Participants can walk, run or ride the route.