Figure 1

Two images of a slice at mid-humerus in a participant before and after 6-week strength training. The manually outlined cross-sectional areas (CSA) of m.triceps brachii show significant increase in muscle area – hypertrophy as a result of elbow extensors training (before training CSA₁ = 27.3 cm², and after training CSA₂ = 29.5 cm²).