Six Butler County Community College softball players were sent to the hospital with extreme muscle soreness after workouts.
Six players went to the hospital last week apparently suffering from exertional rhabdomyolysis, which is a breakdown of skeletal muscle after engaging in physical activity.
Butler said Monday three players were still in the hospital and were expected to be released later this week.
Last Monday, the 21-member softball team worked out at the El Dorado Lake Dam, walking up and down an 80-yard incline and then jogging up and walking backward down the dam four times.
Three players went to the Butler training staff on Tuesday, complaining of soreness in their calves.
Of the seven players tested for rhabdomyolysis, four were hospitalized.
Associated Press information from: The Wichita Eagle