Table 5 Age, anthropometric, blood and urine characteristics of the 24-hr ultra-runners (n = 12)

Age (yrs.)

37.5 ± 8.1

Body mass (kg)

71.1 ± 5.9

70.0 ± 6.7

−1.1 ± 1.2*

−1.6 ± 1.8*

<0.05

Plasma sodium (mmol/L)

140.1 ± 1.2

139.1 ± 2.0

−1.0 ± 2.3

−0.7 ± 1.7

0.26

Plasma potassium(mmol/L)

6.7 ± 1.1

5.1 ± 0.6

−1.6 ± 1.3*

−21.8 ± 17.4*

<0.05

Plasma creatinine (mg/dL)

0.9 ± 0.1

0.9 ± 0.2

0.0 ± 0.1

10.6 ± 12.7

0.06

Plasma creatine kinase (U/L)

224.0 ± 192.0

8813.8 ± 10536.4

8589.8 ± 10500.7*

5782.1 ± 8659.2*

<0.05

Plasma creatine clearance (ml/min)

10657.2 ± 1614.2

9623.2 ± 1837.4

−1034.1 ± 1121.0*

−9.8 ± 11.7*

<0.05

Urine creatinine (mmol/L)

7.5 ± 1.3

17.5 ± 2.6

10.0 ± 2.7**

139.2 ± 47.9**

<0.01

Age (yrs.)

40.0 ± 7.7

Body mass (kg)

56.9 ± 5.2

56.3 ± 5.1

−0.6 ± 0.6

−1.0 ± 1.2

0.16

Plasma sodium (mmol/L)

139.8 ± 2.6

137.8 ± 3.4

−2.0 ± 3.4

−1.4 ± 2.4

0.32

Plasma potassium(mmol/L)

6.2 ± 0.3

4.6 ± 0.2

−1.7 ± 0.2**

−26.4 ± 2.9**

<0.01

Plasma creatinine (mg/dL)

0.7 ± 0.1

0.7 ± 0.1

0.01 ± 0.0

9.0 ± 7.3

0.18

Plasma creatine kinase (U/L)

99.0 ± 23.5

5507.1 ± 6600.4

5408.1 ± 6580.2**

4765.0 ± 4806.5**

0.19

Plasma creatine clearance (ml/min)

10353.4 ± 795.3

9547.0 ± 845.9

−806.4 ± 838.7

−7.6 ± 7.9

0.15

Urine creatinine (mmol/L)

4.5 ± 2.1

15.2 ± 0.2

10.7 ± 1.9**

327.8 ± 276.6**

<0.01