Introduction:

CrossFit represents an interesting fitness paradigm for exercise and sports medicine professionals. However, it is still unknown whether the repetition rate of this type of physical training influences cardiovascular responses and perceived exertion.

Objective:

To find the relation between the repetition rate of the CrossFit WOD Karen to heart rate and the perceived exertion in physically active subjects.

Methods:

A descriptive-correlational study with a quantitative approach was performed with a non-probabilistic sample of 20 subjects. During the application of the WOD Karen test and the Course-Navette test, heart rate was monitored with pulsometers; perceived exertion was assessed through the Borg CR-10 scale and repetition rate was calculated using a mathematical equation. Data were analyzed with the PSPP statistical package and the Spearman's correlation coefficient was used.

Results:

Relative training intensity (r = -0.67) and subjective perception of effort (r = -0.68) were negatively related in women. In both genders there was no significance (p < 0.05).

Conclusion:

Women with a faster repetition rate had a lower heart rate and lower perceived exertion.

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