A normal range is about 33-211 units per liter Franco’s CK level reached more than 259,000 at one point. The soreness turned into pain and she noticed other frightening symptoms: she had trouble walking - to the point where she was grabbing walls and counters for assistance she found it difficult to bend her legs and she noticed her urine was turning a dark brown color.įranco decided to go to the hospital, where tests revealed the amount of creatine kinase (CK) in her blood - an enzyme that can reveal muscle damage - was off the charts.

Over the next day, her legs started to swell and feel “tense,” but Franco thought it was a sign she was building muscle. I thought that was strange at first, but then I was like maybe it’s just my muscles are tired, weak and just a little bit sore.” “(But) as soon as I stepped off the bike, my knees just gave out and I pretty much fell. “I was definitely pushing myself for sure, but I don’t think I was overworking myself to the point where I was like, OK I really overdid it,” Franco recalled. The Marlborough, Massachusetts, resident loves to ride bikes so when the weather got colder and she joined a gym, her cousin recommended the indoor stationary bike workout. The 45-minute spin class Franco took on Sept. Kaelyn Franco noticed her thighs were swollen after the spin class, but thought it meant she was building muscle.

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