Table 6 Age, anthropometric, blood and urine characteristics of the 100-km ultra-runners (n = 19)

Age (yrs.)

43.9 ± 9.6

Body mass (kg)

67.0 ± 8.5

65.1 ± 7.8

−1.8 ± 1.3**

−2.6 ± 1.7**

<0.01

Plasma sodium (mmol/L)

139.6 ± 2.2

137.8 ± 2.9

−1.8 ± 3.6

−1.3 ± 2.6

0.09

Plasma potassium(mmol/L)

6.2 ± 1.0

5.6 ± 0.7

−0.6 ± 1.6

−6.2 ± 24.9

0.18

Plasma creatinine (mg/dL)

0.9 ± 0.2

1.1 ± 0.3

0.2 ± 0.3

25.8 ± 48.1

0.05

Plasma creatine kinase (U/L)

227.1 ± 148.9

4357.1 ± 5822.5

4130.0 ± 5742.7*

1925.5 ± 2180.3*

<0.05

Plasma creatine clearance (ml/min)

8985.3 ± 2219.0

7327.7 ± 2080.2

−1657.5 ± 2146.8**

−16.7 ± 17.9*

<0.05

Urine creatinine (mmol/L)

6.6 ± 4.6

18.5 ± 4.1

11.9 ± 5.8**

365.2 ± 332.1**

<0.01

Age (yrs.)

40.6 ± 5.8

Body mass (kg)

59.0 ± 7.7

57.6 ± 6.6

−1.4 ± 1.2

−2.3 ± 1.6

0.05

Plasma sodium (mmol/L)

138.4 ± 2.3

136.0 ± 1:6

−2.4 ± 2.7

−1.7 ± 1.9

0.12

Plasma potassium(mmol/L)

5.2 ± 0.9

5.5 ± 0.9

0.3 ± 0.6

7.3 ± 13.0

0.28

Plasma creatinine (mg/dL)

0.8 ± 0.1

1.0 ± 0.2

0.2 ± 0.1*

25.6 ± 20.6*

<0.05

Plasma creatine kinase (U/L)

251.1 ± 187.7

1949.3 ± 1357.3

1698.2 ± 1413.2*

990.7 ± 748.9*

0.06

Plasma creatine clearance (ml/min)

9335.1 ± 1748.4

7463.4 ± 2240.3

−1871.7 ± 1199.4*

−20.6 ± 12.9*

<0.05

Urine creatinine (mmol/L)

8.2 ± 4.8

19.4 ± 7.4

11.2 ± 6.7*

192.2 ± 153.0*

<0.05