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Table 3 Post-race analysis by sodium intake in normonatremic participants

From: Prospective Observational Study of Weight-based Assessment of Sodium Supplements on Ultramarathon Performance (WASSUP)

Variable Low sodium intake Mean (SD); Median (min–max) Medium sodium intake Mean (SD) Median (min–max) High sodium intake Mean (SD); Median (min–max) P value
Runner characteristics, n (%) 34 (31.2) 40 (36.7) 35 (32.1)
Body weight change, kg − 3 (4.2); − 2 (− 14–2) − 3 (5.1); − 2 (− 14–2) − 5 (5.8); − 2 (− 16–2) 0.44
Hydration
 Dehydration, n (%) 10 (35.7) 11 (32.4) 11 (36.7) 0.82
 Euhydration, n (%) 11 (39.3) 13 (38.2) 14 (46.7)
 Overhydration, n (%) 7 (25) 10 (29.4) 5 (16.7)
Sodium intake rate, mg/h 135 (46.1); 129 (40–200) 266 (51.7); 250 (210–360) 577 (264.8); 495 (370–1500) < 0.01
Total sodium ingested, g 2 (1); 2 (1–4) 4 (1.1) ; 4 (2–7) 8 (3.2); 7 (3–18) < 0.01
Pace, min/km 11 (3.3); 11 (6–18) 11 (3); 9 (6–18) 11 (3.3); 10 (7–18) 0.85
Total race time, h 15 (4.3); 14 (8–23) 14 (3.8); 12 (8–23) 14 (4.2); 13 (9–23) 0.84
Finishing Rank, n (%)
 Top 10% 4 (12.1) 5 (12.8) 3 (8.8) 0.98
 11–25 % 4 (12.1) 7 (18) 7 (20.6)
 26–50 % 9 (27.3) 11 (28.2) 10 (29.4)
 51–75% 9 (27.3) 8 (20.5) 6 (11.7)
 > 75% 7 (21.2) 8 (20.5) 8 (23.5)
  1. Percentage of missing values: hydration = 16%, and rank = 3%