A new version of an experiment that relates states of mind and sports performance is presented, taking preparation for a dance competition as a case study. The POMS (Profile of Mood States) developed since 1971 was used for the analysis of emotions, using in this case 7 scales and 63 items, as explained in the methodology. This analysis combined data on a participant's heart rate during the last two weeks of preparation for the dance competition, trying to determine the relationship between the objective data (heart rate) and the subjective data (POMS evaluation of mood). Subsequently, the study has been extended to a larger number of competitors (12) with very similar results. On this occasion, the Conclusions analyze these results and present a more detailed description of the previous work with the results of the 12 participants and with a specific focus on the classification of POMS mood states.