Perceived exertion, heart rate and respiratory parameters.

<p>RPE (A), f_R (B), HR (C) and V_E (D) for CON (closed circles), 40∶20s (open circles), 30∶30s (closed triangles) and 20∶40s (open triangles). Data points for f_R, HR and V_E result from a three minute average, including also the recovery periods in INT. Dotted line in panel B indicate the f_R maximum value reached in the incremental ramp exercise test. Letters (a, b and c) report main effect of protocol. (a) <i>P</i><0.05 vs. CON. (b) <i>P</i><0.05 vs. 40∶20s. (c) <i>P</i><0.05 vs. 30∶30s. Asterisks in the upper part of each graph report main effect of time. No protocol by time interaction was observed for the 4 variables. *<i>P</i><0.05 vs. the previous value.