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Table 2 Body weight, body weight gain, food intake, energy intake, and food efficiency

From: Hydrolyzed collagen intake increases bone mass of growing rats trained with running exercise

  20% protein Two-way ANOVA (p value) 40% protein Two-way ANOVA (p value)
    Exercise Collagen Interaction   Exercise Collagen Interaction
Initial body weight (g)          
Collagen(-) EX(-) 115.3 ± 0.9 0.739 0.665 0.787 113.7 ± 2.1 0.759 0.218 0.240
EX(+) 116.1 ± 1.5 115.5 ± 0.7
Collagen(+) EX(-) 116.3 ± 1.6 116.6 ± 1.2
EX(+) 116.4 ± 1.8 115.6 ± 0.6
Final body weight (g)          
Collagen(-) EX(-) 405.3 ± 5.5 <0.001 0.250 0.350 411.7 ± 8.8 <0.001 0.014 0.903
EX(+) 342.0 ± 7.2 354.1 ± 8.5
Collagen(+) EX(-) 391.0 ± 8.5 391.5 ± 5.4
EX(+) 340.5 ± 7.3 335.7 ± 8.7
Body weight gain (g/d)          
Collagen(-) EX(-) 4.0 ± 0.1 <0.001 0.189 0.259 4.1 ± 0.1 <0.001 0.006 0.758
EX(+) 3.1 ± 0.1 3.2 ± 0.1
Collagen(+) EX(-) 3.7 ± 0.1 3.7 ± 0.1
EX(+) 3.0 ± 0.1 3.0 ± 0.1
Food intake (g/d)          
Collagen(-) EX(-) 20.9 ± 0.2 <0.001 0.215 0.147 19.9 ± 0.2** <0.001 0.019 0.712
EX(+) 18.2 ± 0.4 17.9 ± 0.3
Collagen(+) EX(-) 20.2 ± 0.2 19.3 ± 0.2**
EX(+) 18.3 ± 0.3 17.5 ± 0.12*
Food efficiency1          
Collagen(-) EX(-) 0.19 ± 0.00 <0.001 0.224 0.784 0.20 ± 0.00** <0.001 0.028 0.926
EX(+) 0.17 ± 0.00 0.18 ± 0.00*
Collagen(+) EX(-) 0.18 ± 0.01 0.19 ± 0.00
  EX(+) 0.16 ± 0.00     0.17 ± 0.01    
  1. 1Food efficiency was calculated by Body weight gain (g/d)/Food intake (g/d). EX(−): sedentary group, EX(+): exercise group.
  2. Values are expressed as means ± SE. Data were analyzed by two-way ANOVA at the 5% level of significance. Interaction means Exercise-Collagen interaction. *p < 0.05 and *p < 0.01 vs. respective 20% protein group.