Table 4.
Football pre-season camp practice hydration markers by groups.
| Variables | SCT (n = 9) | CON (n = 9) | p value |
|---|---|---|---|
| Body weight loss (kg) | − 0.9 ± 0.9 (− 3.6 to − 1.8)a | − 1.3 ± 1.1 (− 4.5 to 1.8) | 0.008 |
| Body weight change (%) | − 0.8 ± 0.8 (− 3.5 to − 1.1)a | − 1.0 ± 0.9 (− 3.2 to 1.3) | 0.04 |
| Pre-urine Na+ (mmol/L) | 98.4 ± 32.1 (19.4–167.6)a | 159.6 ± 62.9 (27.9–284.1) | < 0.001 |
| Pre-urine K+ (mmol/L) | 37.2 ± 18.4 (7.4–115.4)a | 55.8 ± 29.1 (3.8–152.2) | < 0.001 |
| Pre-urine Cl− (mmol/L) | 88.5 ± 34.4 (14.4–177.2)a | 150.2 ± 57.7 (24.2–290.9) | < 0.001 |
| Pre USG | 1.019 ± 0.005 (1.007–1.035)a | 1.026 ± 0.008 (1.005–1.047) | < 0.001 |
| Post-urine Na+ (mmol/L) | 72.0 ± 27.2 (29.7–167.5)a | 116.6 ± 52.5 (23.8–285.6) | < 0.001 |
| Post-urine K+ (mmol/L) | 37.4 ± 11.7 (11.7–80.8)a | 63.8 ± 26.4 (14.5–169.9) | < 0.001 |
| Post-urine Cl− (mmol/L) | 57.1 ± 28.1 (5.4–159.9)a | 93.7 ± 48.6 (6.7–276.0) | < 0.001 |
| Post USG | 1.020 ± 0.005 (1.004–1.030)a | 1.030 ± 0.008 (1.006–1.050) | < 0.001 |
| Sweat Na+ (mmol/L) | 55.4 ± 13.6 (29.6–88.6)a | 45.5 ± 10.6 (25.1–74.5) | < 0.001 |
| Sweat K+ (mmol/L) | 4.7 ± 1.2 (3–7.2)a | 4.3 ± 0.9 (2.9–6.8) | 0.004 |
| Sweat Cl− (mmol/L) | 52.5 ± 13.0 (25.9–83.4)a | 43.3 ± 9.9 (23.3–71.9) | < 0.001 |
| Sweat rate (mg/cm2/min) | 1.22 ± 0.22 (0.74–1.82) | 1.25 ± 0.25 (0.74–1.96) | 0.32 |
Pre pre-practice, Post post-practice, SCT sickle cell players, CON position-matched control.
aSignificant difference in SCT compared to CON, data were presented as mean ± SD (range) of averaged practices in the pre-season training camp.