Major increase in creatine kinase after intensive exercise.

Area of Science:

• Sports Medicine
• Exercise Physiology
• Biochemistry

Background:

• Exercise-induced rhabdomyolysis is a growing concern, frequently leading to hospitalizations.
• The actual incidence of exercise-induced rhabdomyolysis remains unclear.
• Media attention highlights public interest and debate surrounding this condition.

Purpose of the Study:

• To investigate creatine kinase (CK) level changes in healthy students post-intensive exercise.
• To explore correlations between CK levels, perceived muscle pain, and previous exercise history.

Main Methods:

• A within-subjects design was employed with 24 healthy students.
• Participants underwent a single intensive workout session.
• Blood samples were collected and analyzed for CK levels before and after the exercise bout.

Main Results:

• All participants showed elevated CK levels post-exercise, with 58% exceeding 5,000 IU/l.
• Median CK levels increased from 104 IU/l pre-exercise to 6,071 IU/l on day 4 (p < 0.001).
• A significant negative correlation was found between prior strength training frequency and CK increase (rho = -0.477, p = 0.021).

Conclusions:

• A substantial rise in CK levels is a typical physiological response to intensive exercise.
• The magnitude of CK elevation is influenced by an individual's exercise history.
• Further research is needed to determine if exercise-induced rhabdomyolysis requires different treatment protocols compared to rhabdomyolysis from other causes.