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Table 3 Nitrogen balance and nutrient intake in the young men immediately and 6 h after exercise

From: Effect of timing of protein and carbohydrate intake after resistance exercise on nitrogen balance in trained and untrained young men

  Trained group (n = 10) Untrained group (n = 10) P value1)
  P0 P6 P0 P6 Group experiment (Trained group vs.(P0 vs. P6) Untrained group) Group vs. experiment
Urinary volume (mL/24 h) 1,617 ± 130 1,618 ± 97 1,501 ± 138 1,536 ± 125 0.060 0.459 0.494
Urinary urea nitrogen (g/24 h) 10.4 ± 0.8** † 10.9 ± 0.7*** 9.0 ± 0.8 9.1 ± 0.9 0.001 0.001 0.005
Nitrogen excretion (g/24 h) 16.0 ± 1.0** † 16.6 ± 0.8*** 14.2 ± 1.1 14.3 ± 1.1 0.001 0.001 0.005
Nitrogen intake (g/24 h) 17.1 ± 1.1** 17.1 ± 1.1** 15.5 ± 1.1 15.5 ± 1.1 0.002 0.624 0.961
Nitrogen balance (g/24 h) 1.1 ± 0.3* † 0.5 ± 0.4** 1.3 ± 0.1 1.2 ± 0.2 0.001 0.001 0.014
Nitrogen balance/body weight (mg/24 h) 15.3 ± 4.0** † 7.4 ± 5.5*** 20.4 ± 2.3 19.0 ± 3.1 0.001 0.001 0.009
Nitrogen balance/LBM (mg/
24 h)
17.4 ± 4.3** † 8.4 ± 0.2** 24.2 ± 2.8 22.5 ± 3.5 0.001 0.001 0.011
TEI (kcal) 3,187 ± 122** 3,109 ± 125** 2,734 ± 220 2,729 ± 230 0.001 0.541 0.652
Protein intake (g) 107.0 ± 7.0** 106.9 ± 6.7 96.9 ± 6.9 96.8 ± 6.8 0.012 0.621 0.412
Protein intake (g/kg body
weight)
15.0 ± 0.1 15.0 ± 0.1 15.0 ± 0.1 15.0 ± 0.1 0.543 0.612 0.546
  1. Values are means ± SD.
  2. 1)By two-way ANOVA with repeated measures analysis of variance with post hoc Tukey’s tests.
  3. Differences from Untrained group, *P <0.05, **P <0.01, ***P <0.001.
  4. Differences from P6, †P <0.01.
  5. LBM, lean body mass; P0, Protein and carbohydrate intake immediately after resistance exercise session; P6, Protein and carbohydrate intake 6 h after resistance exercise session; TEI, total energy intake.