The subjects were MEK162 FDA instructed to read the scale before each session, to create an awareness of their exercise stimulus range and the possible RPE responses. Maximum HR was predicted from the 220 �C age formula if the subjects were under forty years old and the 206.9 �C (0.67 �� age) formula if they were older than 40 years (Gellish et al., 2007). Later, the percentage of heart rate reserve (%HRR) was calculated for each subject. Heart rate reserve (HRR) was determined by predicted maximum HR minus resting HR. The HRR percentage was determined by (exercise HR �C resting HR) X 100/HRR. It is the percentage of the difference between resting and maximal HR. The intensity category was determined using the American College of Sports Medicine classification (Table 1).

Table 1 Classification of physical activity intensity Statistical Analyses Means and standard deviations (SD) were calculated for all variables. A dependent t-test was conducted to determine whether a significant difference exists between HR resting and HR in the end of the cool down (after stretching exercises). Mean values of %HRR, Borg RPE and OMNI RPE scales, every five minutes during the indoor cycling session, were plotted. Distributions of subjects among categories of exercise intensity were examined using the Chi2 test. Contingency table analyses were used to assess the association between Borg and OMNI RPE scales and %HRR categories of intensities. The relationship between HR and %HRR (criterion measures) and both RPE scales recorded (Borg and OMNI scales), in the main phase, were determined using the Pearson product-moment correlation coefficient to determine the validity of both the RPE scales with respect to mean HR and %HRR (criterion measure).

Statistical significance was set at p < 0.05. Analyses were performed using the SPSS 18.0 statistical software package. Results The mean and standard deviation values of heart rate (HR) and percentage of heart rate reserve (%HRR) at rest, main phase, at the end of cool down, and in the total session (mean HR warm up + mean HR main phase + mean HR cool down / 3), as well as mean rating of perceived exertion (RPE) values of the Borg and the OMNI scales during the main phase and the total session are presented in Table 2. Table 2 The mean and standard deviation values of HR, %HRR and RPE scales in the indoor cycling session The mean maximum HR in the main phase was 176.

91 �� 11.02 b?min?1. There were significant differences between resting HR and the final cool down HR (31.18 �� 16.39 b?min?1; p < 0.001) and between % Resting HRR and % final cool down HRR (16.33 �� 8.67; p < 0.001). Mean values of %HRR, the Borg RPE and the OMNI RPE scales, every five minutes during the indoor cycling session, are presented in Figure 1. Mean Dacomitinib %HRR was greater than 65% (hard intensity) from the 10 minute mark (after the warm up) until the 45 minute mark (at the end of the main phase).