Figure 4. Changes in plasma creatine kinase (CK) levels during follow-up after eccentric exercise compared to pre-exercise level of the knee extensor (KE), knee flexor (KF) and elbow flexor (EF) muscles. ** p < 0.01 indicates significant difference from the baseline (pre-exercise). ‡‡ p < 0.01 and ‡‡‡ p < 0.001 indicates significant difference from KE. The symbols (●, ▪, Δ) and their error bars denote mean and SEM.