Blood lactate concentrations were measured 3-min after the warm-up, and 3-min after the
second set, using a lactate analyzer (Lactate Pro, Arkay, Kyoto, Japan) [14]. Lastly ratings of
perceived exertion [15], a subjective measure of intensity, was determined immediately after
each HIIT session. The players were familiarized with the RPE scale one week prior to
the experiment.