3%) developed asymptomatic EAH with post-race see more plasma [Na+] between 132 mmol/L and 134 mmol/L. The lowest post-race plasma [Na+] was 132 mmol/L in these subjects. Pre-race plasma [Na+] in these four subjects was 139 mmol/L. Table 3 summarizes

their pre- and post-race values, fluid intake and foot volume changes. Two subjects had both pre-and post-race plasma [Na+] < 135 mmol/L, with a pre-race plasma [Na+] of 133 mmol/l in one subject, and 131 mmol/L in the other subject, respectively. The change in body mass was significantly and negatively related to the change in plasma [Na+] (Figure 2) and running speed (Figure 3), respectively. Table 3 Data for each individual who was hyponatremic post-race Subject Cytoskeletal Signaling inhibitor Pre-race plasma [Na+] (mmol/L) Post-race plasma NU7026 chemical structure [Na+] (mmol/L) Change in plasma [Na+] (mmol/L) Fluid intake (L) Change in foot volume (%) 1 139 132 – 7 3.0 – 30 2 139 132 – 7 20.0 + 12.5 3 139 134 – 5 4.8 – 20 4 139 134 – 5 14.8 + 8.3 Figure 2 The change in body mass was significantly and negatively related to the change in plasma [Na + ] ( r = -0.35, p = 0.0023).

Figure 3 The change in body mass was significantly and negatively related to running speed ( r = -0.34, p = 0.0028). The subjects consumed a total of 7.64 (2.85) L of fluids during the run, equal to 0.63 (0.20) L/h or 0.10 (0.03) L/kg body mass, respectively. Fluid intake varied between 2.7 L and 20 L (Figure 4). Fluid intake was significantly and negatively related to both post-race Tenoxicam plasma [Na+] (Figure 5) and running speed (Figure 6), respectively, with faster athletes drinking less fluid while

running. The change in plasma volume was associated with total fluid intake (r = 0.24, p = 0.04), but showed no association with the change in plasma [Na+]. Figure 4 Range of fluid intake. Figure 5 Fluid intake was significantly and negatively related to post-race plasma [Na + ] ( r = -0.28, p = 0.0142). Figure 6 Fluid intake was significantly and negatively related to running speed ( r = -0.33, p = 0.0036). Running speed was significantly and negatively related to the change in the foot volume, whereas the volume of the foot tended to decrease in faster runners (Figure 7). Although the volumes of the foot showed no changes during the race, total fluid intake during the race was significantly and positively related to the change in the volume of the foot (Figure 8). The change in the volume of the foot was significantly and negatively related to the change in plasma [Na+] (Figure 9). Figure 7 The change in the volume of the right foot was significantly and negatively related to running speed ( r = -0.23, p = 0.0236). Figure 8 Fluid intake was significantly and positively related to the change in the volume of the right foot ( r = 0.54, p < 0.0001). Figure 9 The change in the volume of the right foot was significantly and negatively related to the change in plasma [Na + ] ( r = -0.26, p = 0.0227).