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Table 2 Concentrations of total Trp, Tyr, LNAA and free-Trp before and after supplementation.

From: Brain serotonin and dopamine modulators, perceptual responses and endurance performance during exercise in the heat following creatine supplementation

    Blood collection time (min)
  Group Trial Rest 40 End
Total [Trp] (μmol·l-1) Plc Pre 58.3(12) 56.7(22) 63.9(11)
   Post 55.2(14) 67.7(22) 75.5(16)§
  Cr Pre 47.8(14) 71.1(16)§ 69.9(17)§
   Post 53.4(5) 62.3(7)§ 71.7(21)§
  Resp Pre 47.5(6) 65.8(15)§ 68.7(18)§
   Post 53.6(7) 62.4(8)§ 71.6(20)§
[Tyr] (μmol·l-1) Plc Pre 85.3(18) 94.8(12) 116(24)§
   Post 76.9(41) 86.5(33) 104.1(36)
  Cr Pre 71.9(37) 111.5(41)§ 121.7(46)§
   Post 81.3(34) 104.9(31)§ 112.4(52)§
  Resp Pre 70.3(31) 112.1(36)§ 118.3(45)§
   Post 74.6(33) 109.8(31)§ 114.5(51)
[LNAA] (μmol·l-1) Plc Pre 831(29) 902(211) 986(254)
   Post 873(233) 897(171) 994(375)
  Cr Pre 744(334) 1076(340) 945(326)
   Post 812(189) 806(372) 933(361)
  Resp Pre 732(279) 1051(273) 962(267)
   Post 764(187) 864(473) 871(322)
Free-[Trp] (μmol·l-1) Plc Pre 2.5(0.6) 3.1(0.7)§ 3.3(0.8)§
   Post 2.6(1.2) 3.2(0.7)§ 3.6(0.9)§
  Cr Pre 2.4(0.7) 2.9(0.6)§ 3.5(0.5)§
   Post 2.4(0.5) 2.6(0.5)*§ 3.0(0.7)*§
  Resp Pre 2.6(0.9) 3.1(0.6) 3.4(0.6)§
   Post 2.3(0.7) 2.7(0.6)* 3.0(0.5)*§
  1. Values are given as median (IQR).
  2. * Indicates a significant difference from pre-supplementation values
  3. § Indicates a significant difference over time compared with the resting value
  4. Resp: "responders"