NL Health Services Warn of Rise in Rare Muscle Condition Linked to Intense Exercise

NL Health Services is advising the public to take precautions during exercise following an increase in cases of rhabdomyolysis, a potentially serious muscle condition.

The health authority says about 20 cases tied to intense physical activity have been reported in the Eastern-Urban Zone since Oct. 1, 2025.

Rhabdomyolysis, often referred to as “rhabdo,” occurs when muscle tissue breaks down and releases harmful substances into the bloodstream. This can lead to complications such as kidney damage and dangerous electrolyte imbalances.

Health officials say the most common symptoms include severe muscle pain, swelling and weakness—typically in the legs or buttocks—as well as dark, tea-coloured urine.

In response, NL Health Services is encouraging residents to follow safe exercise practices. That includes gradually increasing workout intensity, allowing adequate recovery time between sessions and incorporating regular rest days. More strenuous exercise may require 48 to 72 hours of recovery, officials say.

Staying hydrated, balancing workouts across different muscle groups and seeking advice from a healthcare provider or qualified fitness professional are also recommended, particularly for those new to exercise or returning after a break.

Individuals who are older, work in physically demanding jobs or take certain medications—such as cholesterol-lowering drugs, antidepressants or antipsychotics—are advised to consult a doctor before beginning high-intensity training.

Anyone experiencing symptoms of rhabdomyolysis is urged to seek immediate medical attention at the nearest emergency department or urgent care centre.