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Table 1 Body mass change, water intake and route-march time [(Mean ± SD (min – max)]

From: Ad libitum water consumption prevents exercise-associated hyponatremia and protects against dehydration in soldiers performing a 40-km route-march

Item

Combined (n = 25)

Serum [Na+]

≥ 5 mmol/L Δ (n = 5)

<  5 mmol/L Δ (n = 20)

Body Mass Pre (kg)

73.73 ± 9.70 (60.32–98.76)

73.96 ± 5.50 (68.82–81.36)

73.68 ± 9.70 (60.32–98.76)

Body Mass Δ (%)

−4.0 ± 1.4 (− 0.6 – − 7.2)**

−3.0 ± 1.7 (− 0.6 - -4.5)*

−4.4 ± 1.2 (− 2.7 - -7.2)

Total Water Intake (L)

6.7 ± 2.3 (2.9–11.8)

7.4 ± 1.7 (5.9–9.8)

6.3 ± 2.3 (2.9–11.8)

Hourly Water Intake (ml/h)

736 ± 259 (290–1245)

853 ± 198 (684–1166)

691 ± 270 (290–1245)

Route-March Time (hh:mm)

09:11 ± 00:42 (08:19–10:25)

8.72 ± 0.29 (8.19–9.17)

9.26 ± 0.69 (8.40–10.25)

  1. *P < 0.05 between plasma [Na+] ≥ 5 mmol/L Δ vs. < 5 mmol/L Δ; **P < 0.05 between pre- and post-route-march values
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Military Medical Research

ISSN: 2054-9369