Figure 2.

Temporal response of perceived exertion and heart rate during concentric and eccentric type of interval exercise. Line graph with whiskers indicating mean values ± SE for perceived exertion (A,B) and heart rate (C,D) as measured each 2 min during the interval-type pedaling exercise before and after the eight weeks of training of the two groups under the concentric (A,C) or eccentric (B,D) contraction protocol. The rest and pedaling phase of the respective concentric and eccentric interval exercise is exemplarily indicated in panels A and B. *, p < 0.05 vs. 0 min. ‡, p < 0.05 vs. concentric. Repeated-measures ANOVA with a post-hoc test of least significant difference.