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Table 5 Urine specific gravity before and after training

From: Hydration status and fluid intake of urban, underprivileged South African male adolescent soccer players during training

Variable

Training session 1

Difference between measurements before and after training (p-value)

Training Session 2

Difference between measurements before and after training (p-value)

Difference between the first and second training sessions (p-value)

Mean USG before training (g/ml)

1.023 ± 0.005

0.145 *

1.023 ± 0.006

0.279 *

0.928 *

Mean USG after training (g/ml)

1.023 ± 0.007

1.024 ± 0.006

0.873 *

Hydration status before training, n (%)Ò‚

     

• Extremely hyperhydrated

3 (4)

0.184#

2 (3)

0.646#

0.692#

• Slightly hyperhydrated

3 (4)

0.692#

4 (5)

0.464#

0.573#

• Well hydrated

4 (5)

0.039#

8 (10)

0.419#

0.349#

• Euhydrated

9 (11)

0.790#

9 (11)

0.176#

0.320#

• Slightly dehydrated

24 (30)

0.733#

23 (29)

0.015#

0.592#

• Very dehydrated

21 (27)

0.256#

11 (14)

0.000#

0.000#

• Extremely dehydrated

15 (19)

0.363#

22 (28)

0.384#

0.604#

Hydration status after training n (%)Ò‚

     

• Extremely hyperhydrated

6 (8)

 

4 (5)

 

0.420#

• Slightly hyperhydrated

2 (3)

 

5 (6)

 

0.607#

• Well hydrated

1 (1)

 

3 (4)

 

0.780#

• Euhydrated

11 (14)

 

5 (6)

 

0.699#

• Slightly dehydrated

21 (27)

 

15 (19)

 

0.061#

• Very dehydrated

19 (24)

 

24 (30)

 

0.896#

• Extremely dehydrated

19 (24)

 

23 (29)

 

0.000#

  1. *: Paired samples t test Ò‚: According to urine specific gravity measurements.
  2. #: Chi-square test Urine specific gravity based on human hydration reference values developed for adults [16].