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Table 2 Serum (S), plasma (P) and urine (U) variables measured pre- and post-march [(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)

S [Na+] Pre (mmol/L)

141 ± 1 (140–143)

141 ± 1 (140–143)

141 ± 1 (140–143)

S [Na+] Post (mmol/L)

139 ± 2 (134–143)@

135 ± 1 (134–138)***

140 ± 2 (138–143)

S [Cl−] Pre (mmol/L)

105 ± 2 (100–109)

104 ± 2 (101–107)

105 ± 2 (100–109)

S [Cl−] Post (mmol/L)

105 ± 2 (100–110)

102 ± 2 (100–104)**

106 ± 2 (102–110)

P Osm Pre (mOsmol/kg H2O)

303 ± 8 (294–320)

300 ± 5 (294–307)

303 ± 8 (294–320)

P Osm Post (mOsmol/kg H2O)

298 ± 8 (285–323)@

297 ± 11 (285–314)

299 ± 8 (289–323)

P [AVP] Pre (pg/ml)

2.2 ± 1.5 (0.5–7.8)

1.4 ± 0.6 (0.5–2.2)

2.4 ± 1.6 (0.5–7.8)

P [AVP] Post (pg/ml)

11.2 ± 6.4 (1.8–32.8)@

11.4 ± 3.5 (6.8–14.3)

11.5 ± 7.1 (3–32.8)

S [BUN] Pre (mg/dl)

22.4 ± 4.4 (12.6–32.7)

21.6 ± 3.9 (16.2–26.3)

22.9 ± 3.6 (12.6–32.7)

S [BUN] Post (mg/dl)

28.9 ± 4.0 (21.8–35.0)@

30.9 ± 5.5 (21.8–35.0)

28.5 ± 5.5 (22.1–34.7)

S [Glucose] Pre (mmol/L)

4.9 ± 0.7 (3.5–6.1)

5.4 ± 0.5 (4.8–6.1)

4.8 ± 0.8 (3.5–6.1)

S [Glucose] Post (mmol/L)

4.8 ± 1.0 (3.1–7.7)

4.0 ± 0.5 (3.1–4.5)*

5.1 ± 1.1 (4.0–7.7)

S [CK] Pre (U/L)

1422 ± 830 (426–3192)

1148 ± 521 (530–1652)

1346 ± 760 (426–3192)

S [CK] Post (U/L)

3893 ± 6359) (933–5121)

2301 ± 543 (1604–2860)

2696 ± 1135 (923–5121)

S [Creatinine] Post (ʮmol/L)

111 ± 18 (73–155)

107 ± 12 (93–125)

114 ± 18 (73–155)

S [Creatinine] Post (ʮmol/L)

100 ± 15) (63–137)

105 ± 14 (83–125)

98 ± 14 (63–137)

P volume Δ (%)

−11.9 ± 25.1 (− 27.3–27.5)

−4.7 ± 32.9 (− 19.7–24.8)

−13.7 ± 23.4 (− 27.3–27.5)

U [Na+] Pre (mmol/L)

168 ± 37 (61–230)

141 ± 58 (61–221)

175 ± 31 (100–230)

U [Na+] Post (mmol/L)

142 ± 54 (50–257)@

95 ± 32 (50–141)*

159 ± 53 (56–257)

U Osm Pre (mOsmol/kg H2O)

1025 ± 156 (747–1362)

1002 ± 185 (747–1231)

1045 ± 139 (795–1362)

U Osm Post (mOsmol/kg H2O)

1097 ± 136 (788–1388)@

1046 ± 198 (788–1313)

1114 ± 125 (845–1388)

  1. *P < 0.05; **P < 0.01; ***P < 0.001; between plasma [Na+] ≥ 5 mmol/L Δ vs. < 5 mmol/L Δ; @P < 0.05 between pre-march vs. post-march
  2. Na+ Sodium, Cl− Chloride, Osm Osmolality, AVP Arginine vasopressin, BUN Blood urea nitrogen, CK Creatine kinase
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Military Medical Research

ISSN: 2054-9369