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Table 1 Leg muscle amino acid kinetics

From: Acute testosterone administration does not affect muscle anabolism

Factor

Phe

LEU

LYS

ALA

T

IL

T

IL

T

IL

T

IL

Fin

188 ± 39

194 ± 29

400 ± 86

413 ± 60

855 ± 241

760 ± 118

657 ± 102

686 ± 71

Fout

205 ± 47

210 ± 29

445 ± 112

449 ± 65

932 ± 299

799 ± 131

807 ± 160

786 ± 62

Fv,a

76 ± 38

57 ± 22

195 ± 79

32 ± 21

552 ± 208

384 ± 120

273 ± 45

342 ± 65

Fm,a

113 ± 38

137 ± 32

205 ± 19

381 ± 69

302 ± 43

376 ± 102

384 ± 64

345 ± 20

Fv,m

130 ± 41

153 ± 34

250 ± 34

417 ± 73

380 ± 104

414 ± 109

533 ± 118

444 ± 11

Fm,o

88 ± 14

99 ± 15

151 ± 37

142 ± 19

295 ± 111

355 ± 61

760 ± 67

715 ± 112

Fo,m

71 ± 10

83 ± 17

106 ± 9

106 ± 10

217 ± 52

317 ± 49

611 ± 49

616 ± 108

Ram

201 ± 44

236 ± 35

356 ± 40

523 ± 77

597 ± 150

731 ± 148

1144 ± 125

1060 ± 116

NB

−17 ± 9

−16 ± 3

−46 ± 30

−36 ± 15

−78 ± 63

−38 ± 13

−150 ± 65

−99 ± 22

DNS

      

2114 ± 186

1988 ± 312

  1. Values are means ± SE and are expressed as nmol · min− 1 · 100 ml leg− 1. DNS de novo synthesis. Bolded values indicate significant differences (p ≤ 0.05) between T (testosterone) and IL (intralipid) infusion. Fin, amino acid (AA) inflow into leg from systemic circulation via femoral artery; Fout, AA outflow from leg via femoral vein; Fv,a, direct AA outflow from artery to vein without entering intracellular fluid; Fm,a, inward AA transport from femoral artery into free muscle AA pool; Fv,m, outward AA transport from intracellular pool into femoral vein; Fm,o, intracellular AA appearance from endogenous sources; Fo,m, intracellular AA utilization; Ram = Fm,o + Fm,a, total intracellular AA rate of appearance; NB, net AA balance