What should you know about CrossFit and rhabdo?

Rhabdomyolysis is the breakdown of muscle tissue. Muscle proteins and other substances can enter the bloodstream and place strain on the kidneys. It may follow a demanding workout, especially when the session is far beyond your usual training, recovery is limited, or heat and dehydration add stress.

Ordinary post-exercise soreness often develops later and gradually settles. Rhabdomyolysis may bring unusually severe muscle pain, swelling, weakness, marked tenderness, or urine that looks dark. Symptoms can affect the muscles used during the workout, but the appearance of symptoms varies.

Stop the workout if pain feels extreme or your strength is unexpectedly reduced. Do not try to train through swelling, weakness, or dark urine. Arrange prompt medical assessment and explain the workout intensity, heat exposure, fluid intake, supplements, and the time symptoms began.

A clinician may examine you and use blood and urine tests to assess muscle injury and kidney function. Until assessed, avoid strenuous exercise and avoid taking medicines or supplements for the problem unless a clinician advises you. Sip fluids normally if you can drink safely, but do not rely on home hydration to treat suspected rhabdomyolysis.

Seek urgent medical care for dark or tea-coloured urine, very little urine, severe or worsening muscle pain, substantial swelling, profound weakness, vomiting, confusion, fainting, or trouble breathing. These signs need assessment because muscle breakdown can affect fluid balance and kidney function.

Ask: Could my symptoms represent rhabdomyolysis rather than expected soreness? Which tests are needed? When can I safely resume training? How should my coach adjust intensity, rest, heat exposure, and hydration?