Table 2 Post-race analysis by weight-based sodium intake
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 (%) | 53 (32.9) | 53 (32.9) | 55 (34.2) | – |
Body weight change, kg | − 4 (7.9); − 2 (− 50–2) | − 2 (4.4); − 2 (− 14–3) | − 4 (5.5); − 2 (− 17–2) | 0.24 |
Hydration | 0.31 | |||
Dehydration, n (%) | 15 (31.9) | 10 (20) | 17 (35.4) | |
Euhydration, n (%) | 18 (38.3) | 23 (46) | 22 (45.8) | |
Overhydration, n (%) | 14 (29.8) | 17 (34) | 9 (18.8) | |
Serum sodium, mEq | 141 (5.8); 140 (126–158) | 140 (6.3); 140 (126–158) | 142 (5.8); 140 (133–160) | 0.38 |
Creatinine, mg/dL | 1 (0.3); 1 (0.5–1.8) | 1 (0.5); 1 (0.5–3.7) | 1 (0.3); 1 (0.1–1.8) | 0.62 |
Sodium intake rate, mg/h/kg | 132 (55.5); 122 (25–235) | 269 (66); 250 (175–450) | 533 (260.7); 450 (267–1500) | < 0.01 |
Total sodium ingested, g | 2 (1.2); 2 (0–6) | 4 (1.6); 4 (1–9) | 7 (3.6); 7 (3–18) | < 0.01 |
Sodium diagnoses | 0.64 | |||
Hyponatremia, n (%) | 3 (7.1) | 4 (9.8) | 1 (2.2) | |
Hypernatremia, n (%) | 10 (23.8) | 8 (19.5) | 9 (20) | |
Normonatremia, n (%) | 29 (69.1) | 29 (70.7) | 35 (77.8) | |
Temperature of races | 0.81 | |||
Hot races, n (%) | 33 (62.3) | 35 (66) | 33 (60) | |
Cold races, n (%) | 20 (37.7) | 18 (34) | 22 (40) | |
Pace, min/km | 11 (3); 11 (6–18) | 11 (3.2); 10 (6–20) | 10 (3); 9 (7–18) | 0.31 |
Total race time, h | 15 (3.9); 15 (8–23) | 14 (4.2); 14 (8–26) | 13 (3.8); 12 (9–23) | 0.28 |
Finishing rank, n (%) | 0.35 | |||
Top 10% | 7 (14.3) | 8 (15.4) | 7 (14.3) | |
11–25% | 8 (16.4) | 8 (15.4) | 12 (24.5) | |
26–50% | 9 (18.4) | 13 (25) | 17 (34.7) | |
51–75% | 16 (32.7) | 15 (28.9) | 6 (12.2) | |
> 75% | 9 (18.4) | 8 (15.4) | 7 (14.3) |