The increase in HR values from the start of the fight suggest that TKD performance, even if characterized by intermittent patterns of activity, has high physiological demands. It must also be pointed out that, regardless of the intermittent character of the exercise load, HR during TKD fighting oscillated close to maximum values without substantial decrease. In particular, the results suggest that women TKD fight relies mainly on anaerobic metabolism, with athletes spending most of the fighting time close to the maximal relative exercise intensity. However, it should be also considered that due to the particular competitive situation a TKD athlete experiences high levels of arousal, which can be manifested in changes in many physiological variables, including HR [10]. Although the psychological stress of a fighting should not be neglected and could affect HR data interpretation, it should be noticed that our results are similar to the ones previously reported by Heller et al. [11].