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. 2011 Apr 15;6(4):e18751. doi: 10.1371/journal.pone.0018751

Figure 1. The RR interval and heart rate of age-matched controls and professional soccer players before and following a competitive game.

Figure 1

A: The RR interval was significantly longer (A) and heart rate was significantly lower (B) in soccer players before the game compared to controls (n = 76 persons/group; ***p<0.001 vs. age-matched control; Means ± S.E.M.; ###p<0.001 vs. before game values).