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Table 1 Rate of perceived exertion (RPE) in each level of the KSAT and the number of participants at each level. CAF, caffeine; NaHCO3, sodium bicarbonate; PLA, placebo; CON, control

From: Caffeine and sodium bicarbonate supplementation alone or together improve karate performance

Conditions   Level 2 Level 3 Level 4 Level 5 Level 6 Level 7 Level 8 Level 9
Caff+NaHCO3 RPE 6.63 ± 0.52 7.87 ± 1.81 9.25 ± 1.48 11.38 ± 2.07 12.75 ± 2.05 15.37 ± 1.50 18.29 ± 0.95 19
n 8 8 8 8 8 8 7 3
NaHCO3 RPE 6.88 ± 0.83 8.13 ± 1.12 9.50 ± 1.51 10.87 ± 1.35 14.25 ± 1.75 16.75 ± 1.16 19.12 ± 0.64 19
n 8 8 8 8 8 8 8 1
Caffeine RPE 6.75 ± 0.71 8.50 ± 1.19 10.12 ± 1.73 11.87 ± 2.53 14.12 ± 2.53 16.88 ± 1.64 18.29 ± 0.95 19
n 8 8 8 8 8 8 7 1
PLA RPE 7.0 ± 1.69 8.75 ± 2.05 10.37 ± 1.92 12.25 ± 2.66 14.75 ± 2.60 17.50 ± 1.93 18.80 ± 0.45
n 8 8 8 8 8 8 5 0
CON RPE 7.25 ± 1.28 10.75 ± 2.31 12.25 ± 1.48 15.37 ± 1.06 16.87 ± 1.36 18.50 ± 0.76 19.5 ± 0.58
n 8 8 8 8 8 8 4 0