Objective: To evaluate the affective responses to running with imposed velocity or self-selected time trials in runners, as well as the effects on volume load (VL) and training impulse (TRIMP). Anxiety was also determined. We establish the level of association between the dependent variables. Methods: Three visits were carried out. 1st visit consisted of a maximum running effort test (VO₂Max). 2nd and 3rd visits, participants were divided between the time limit (T_Lim) or time trial 1000m running at self-selected intensity (T₁₀₀₀). Participant responded to felt arousal, feeling and anxiety SUDS scale, before, during and after T_Lim and T₁₀₀₀. Results: T_Lim vs. T₁₀₀₀ (p<0.001), V_Peak x V₁₀₀₀ (p=0.013), showed differences, but did not influence VL_TLim vs. VL₁₀₀₀ (3181.34 ± 872.22 vs. 3570.60 ± 323.3; p=0.062). TRIMP showed no differences (p=0.068). Arousal did not differ between the pre-exercise (p=0.772) and post-exercise (p=0.083) groups, but was different during (p=0.035). There were differences between groups in the pre-exercise (p=0.012), during (p<0.001) and post-exercise (p<0.001) for feeling and anxiety scores. The correlation between TRIMP and affective scores showed association for T_Lim (r=0.46; p=0.043). Conclusion: The self-selected exercise generated positive affective responses, but the same did not occur for the imposed T_Lim. VL and TRIMP presented equality. There was association TRIMP and T_Lim feeling scale. T_Lim significantly increased anxiety scores.