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Table 1 Summary and results of the nine studies reviewed examining the impacts of acute caffeine supplementation on combat sports performance

From: Acute caffeine supplementation in combat sports: a systematic review

Ref. Participants Supplementation Test Results
Felippe et al. [5] Trained judo athletes (n = 10) EC1: 6 mg/kg caffeine (60 min pretest) EC2: 3 × 100 mg/kg NaHCO3 (120, 90 and 60 min pretest) EC3: 3 × 100 mg/kg NaHCO3 (120, 90 and 60 min pretest) + 6 mg/kg caffeine (60 min pretest) EC4: placebo 3 x SJFT ANOVA indicated differences between treatments: SJFT1: EC3 5.17% improved number of knockdowns vs EC4 (24.4 +/- 1.5 vs 23.2 +/- 1.5) SJFT3: EC3 8.44% improved and EC2 5.33% improved number of knockdowns vs EC4 (24.4 +/- 1.0 and 23.7 +/- 1.1 vs 22.5 +/- 1,6) Mean performance (sum of 3 SJFT): EC3 5.66% improved number of knockdowns vs EC4 (72.7 +/- 3.1 vs 68.8 +/- 4.2)
Diaz-Lara et al. [48] Elite Brazilian jiu-jitsu athletes (n = 14) EC1: 3 mg/kg caffeine (60 min pretest) EC2: placebo Díaz-Lara et al. [49] tests pre + simulated combat + Díaz-Lara et al. [49] tests (post-combat 1) + combat 2 + Díaz-Lara et al. [49] tests (post-combat 2) Hand grip strength (pre): Dominant hand: as in Díaz-Lara et al. [49] Non-dominant hand: as in Díaz-Lara et al. [49] CMJ (pre): as in Díaz-Lara et al. (2016) Bench press 1 RM (pre): as in Díaz-Lara et al. [49] Max number of bench press reps at maximal strength load (pre): as in Díaz-Lara et al. [49] Static lift test (pre): EC1 15.8% improved (values not specified) Static lift test (post-combat 2): EC1 17.8% improved (values not specified)
Diaz-Lara et al. [49] Elite Brazilian jiu-jitsu athletes (n = 14) EC1: 3 mg/kg caffeine (60 min pretest) EC2: placebo Hand grip strength CMJ 1 RM bench press Max number of bench press reps at max load Static lift test Hand grip strength: Dominant hand: EC1 4.4% improved vs placebo (55.9 +/- 5.1 vs 53.5 +/- 3.2 kg) Non-dominant hand: EC1 4.9% improved vs placebo (50.7 +/- 4.9 vs 48.4 +/- 5.2 kg) CMJ: EC1 3.7% improved jump height vs placebo (41.7 +/- 3.1 vs 40.6 +/- 2.6 cm) Bench press 1 RM: EC1 3.0% improved vs placebo (93.3 +/- 7.5 vs 90.5 +/- 7.7 kg) Max number of bench press reps at maximal strength load: EC1 14.7% improved (25.0 +/- 8.7 vs 21.8 +/- 8.1 reps)
Astley et al. [50] Young national competition judo athletes (n = 18) EC1: 4 mg/kg caffeine (60 min pretest) EC2: placebo SJFT Total knockdowns: EC1 improved 31.22% vs EC2 (29.0 +/- 2.6 vs 22.1 +/- 3.4) SJFT index: EC1 reduced by 22.29% vs EC2 (12.2 +/- 0.5 vs 15.7 +/- 0.9)
Aedma et al. [51] Brazilian jiu-jitsu practitioners and wrestlers (n = 14) EC1: 5 mg/kg caffeine (30 min pretest) EC2: placebo 4 x arm ergometer test (6 × 15 s + 40 s rest). Rest: 30 min Average and peak power recorded in test: significant time but no treatment differences detected by ANOVA
Lopes-Silva et al. [52] National and/or international competition taekwondists (n = 10) EC1: 5 mg/kg caffeine (60 min pretest) EC2: placebo 3 x simulated taekwondo match rounds No differences in any of the performance variables examined.
Cortez et al. [54] National and/or international competition taekwondists (n = 13) EC1: 5 mg/kg caffeine (60 min pretest) EC2: placebo 3 x dollyo chagi circular kick pre and post test of 3 × 60 s CMJ Dollyo chagi (pre): Reaction speed: EC1 29% improved vs EC2 (0.65 +/- 0.17 vs 0.91 +/- 0.18 s) Dollyo chagi (post): Reaction speed: EC1 25% improved vs EC2 (1.04 +/- 0.13 vs 1.30 +/- 0.14 s)
Lopes-Silva et al. [55] Trained judo athletes (n = 6) EC1: 6 mg/kg caffeine (60 min pretest) following weight loss protocol EC2: placebo following weight loss protocol 3 x SJFT ANOVA confirmed no effects according to time or treatment
Santos et al. [93] Trained taekwondo athletes (n = 10) EC1: 5 mg/kg caffeine (50 min pretest) EC2: placebo 2 x (5 x bandal tchagui kick + simulated taekwondo match). Rest: 30 min Bandal tchagui kick pre-combat 1: EC1 11.9% improvement vs EC2 (0.37 +/- 0.007 vs 0.45 +/- 0.05 s) Combat 2: EC1 21% improvement in mean number of throws per round (12.20 +/- 6.71 vs 8.88 +/- 3.21 throws) Combat 1 vs combat 2: EC2 reduced throw number and time (values not specified)
  1. EC experimental condition, NaHCO3 sodium bicarbonate, SJFT special judo fitness test, CMJ countermovement jump test