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Table 2 Plasma biochemical parameters and ratings of perceived exertions in the AA and PL trials

From: Branched-chain amino acids, arginine, citrulline alleviate central fatigue after 3 simulated matches in taekwondo athletes: a randomized controlled trial

  Triala Baseline post-M1 post-M2 pre-M2 post-M3
Urea (mM)1 AA 4.61 ± 1.72 8.20 ± 3.65 12.70 ± 4.50* 13.25 ± 4.10* 17.56 ± 5.30*
PL 4.55 ± 1.90 7.36 ± 2.30 12.95 ± 5.00* 9.07 ± 4.00 16.92 ± 5.10*
Lactate (mM)2 AA 2.95 ± 0.77 13.38 ± 4.17* 12.78 ± 3.77 2.22 ± 0.53 11.93 ± 2.90
PL 3.19 ± 0.75 13.37 ± 2.96* 12.24 ± 3.45 2.36 ± 0.55 12.57 ± 2.27
Glucose (mM)3 AA 5.26 ± 0.28 4.39 ± 0.44* 4.97 ± 0.50 5.37 ± 0.39 5.12 ± 0.50
PL 5.25 ± 0.44 4.20 ± 0.27* 4.89 ± 0.39 5.36 ± 0.22 5.28 ± 0.39
Glycerol (μM)4 AA 27.75 ± 10.37 49.38 ± 22.00 76.48 ± 27.14* 79.81 ± 24.91* 105.78 ± 31.76*
PL 27.42 ± 11.39 44.34 ± 13.96 78.00 ± 30.22* 54.65 ± 24.31 101.91 ± 30.93*
NEFA (mM)b,5 AA 0.33 ± 0.17 0.21 ± 0.08 0.34 ± 0.15 0.38 ± 0.12 0.47 ± 0.20
PL 0.36 ± 0.16 0.21 ± 0.06 0.38 ± 0.10 0.58 ± 0.24 0.55 ± 0.19
RPEc,6 AA 9.3 ± 2.0 16.0 ± 2.0* 15.9 ± 2.0* - 15.2 ± 3.0*
PL 9.3 ± 2.0 12.8 ± 2.0* 13.6 ± 2.0* - 14.6 ± 2.0*
  1. a AA BCAA, arginine, and citruline, PL placebo. b NEFA non-esterified fatty acid. c RPE ratings of perceived exertion. *Significantly different from baseline in the same trial (p < .05)
  2. 1Main effects: trial: p = .329; time: p < .001; interaction: p = .167
  3. 2Main effects: trial: p = .325; time: p < .001; interaction: p = .165
  4. 3Main effects: trial: p = .816; time: p < .001; interaction: p = .520
  5. 4Main effects: trial: p = .325; time: p < .001; interaction: p = .165
  6. 5Main effects: trial: p = .117; time: p < .001; interaction: p = .213
  7. 6Main effects: trial: p = .886; time: p = .003; interaction: p = .718