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Table 3 Heart (HR) and rating of perceived exertion (RPE) for the cardiorespiratory and neuromuscular fitness classifications (mean ± SD)

From: Caffeine supplementation is ergogenic in soccer players independent of cardiorespiratory or neuromuscular fitness levels

ClassificationVariableTreatmentGroupTreadmill periods
1st2nd3rd4th
Cardiorespiratory
fitness
HR
(b∙min−1)*†
CaffeineHCF152.88 ± 10.70159.02 ± 10.62157.49 ± 14.53172.18 ± 6.76
MCF159.01 ± 11.86163.22 ± 11.71161.13 ± 13.33173.30 ± 15.42
PlaceboHCF150.97 ± 11.99156.84 ± 11.14150.88 ± 12.49160.03 ± 7.24
MCF151.43 ± 16.59161.44 ± 12.28159.50 ± 11.59163.20 ± 20.05
RPE*†CaffeineHCF10.00 ± 1.5111.67 ± 2.2811.70 ± 2.2914.67 ± 1.93
MCF11.23 ± 0.9813.03 ± 1.3413.47 ± 1.5715.23 ± 1.66
PlaceboHCF10.37 ± 1.7112.33 ± 2.1512.97 ± 1.5815.53 ± 1.34
MCF11.20 ± 1.0313.30 ± 1.7014.43 ± 1.4916.60 ± 1.55
Neuromuscular
fitness
HR
(b∙min−1)*†
CaffeineHNF155.28 ± 13.33163.76 ± 14.14159.70 ± 17.36178.54 ± 10.39
MNF156.61 ± 9.86158.49 ± 6.66158.91 ± 9.72168.22 ± 11.73
PlaceboHNF155.00 ± 11.25158.16 ± 12.42157.70 ± 2.12167.19 ± 10.40
MNF147.40 ± 16.15160.12 ± 11.42152.69 ± 13.07156.04 ± 16.82
RPE*†CaffeineHNF10.53 ± 1.6411.83 ± 1.9611.83 ± 2.2514.30 ± 1.16
MNF10.70 ± 1.1712.87 ± 1.8913.33 ± 1.7715.60 ± 2.09
PlaceboHNF10.63 ± 1.6512.27 ± 1.5713.10 ± 1.5615.47 ± 1.22
MNF10.93 ± 1.2613.37 ± 2.2114.30 ± 1.6416.47 ± 1.60
  1. * Significant main effect of treatment (p < 0.01)
  2. † Significant main effect of time (p < 0.001)