Table 2.
Differences in biochemical and hormonal variables between the heat-tolerant and heat-intolerant groups.
| Variables | RV ‡ | Group | Pre-Test | Post-Test | ∆ from Pre-Test to Post-Test † |
|---|---|---|---|---|---|
| ALT (U/L) † | 7–52 | Heat tolerant | 18.80 (10.10) a | 20.25 (11.60) | 0.80 (1.55) |
| Heat intolerant | 24.60 (11.00) | 26.70 (12.90) | 1.90 (1.95) b | ||
| AST (U/L) † | 13–39 | Heat tolerant | 25.10 (13.10) | 24.70 (13.40) | 2.00 (3.13) |
| Heat intolerant | 26.80 (9.30) | 28.00 (11.30) | 3.25 (2.75) | ||
| CK (U/L) † | 30–223 | Heat tolerant | 140.35 (109.80) | 142.00 (121.20) | 12.75 (27.82) |
| Heat intolerant | 145.50 (141.00) | 164.85 (122.50) | 27.95 (24.50) b | ||
| Sodium (mEq/L) † | 136–145 | Heat tolerant | 138.72 (2.70) | 138.40 (3.00) | 0.45 (3.02) |
| Heat intolerant | 137.60 (2.10) | 137.70 (4.20) | −0.40 (5.50) | ||
| Potassium (mEq/L) † | 3.5–5.1 | Heat tolerant | 4.82 (2.00) | 4.31 (0.28) | −0.10 (0.33) |
| Heat intolerant | 4.33 (0.29) | 4.36 (0.54) | 0.07 (0.56) | ||
| Chloride (mEq/L) † | 98–107 | Heat tolerant | 103.15 (3.50) | 102.50 (3.00) | −0.45 (2.47) |
| Heat intolerant | 101.90 (3.30) | 99.60 (7.40) | −2.05 (6.42) | ||
| Cortisol (nmol/L) * | 193–690 | Heat tolerant | 341.37 (132.04) | 225.69(104.11) | −108.44 (186.29) b |
| Heat intolerant | 384.63(178.96) | 391.07 (182.51) | 5.07 (333.19) | ||
| Creatinine (µmol/L) * | 53–110 | Heat tolerant | 74.11 (11.93) | 78.28 (11.59) | 5.00 (5.50) |
| Heat intolerant | 75.41 (13.65) | 91.00 (13.85) | 13.00 (11.75) b | ||
| Urea (mmol/L) * | 2.50–8.93 | Heat tolerant | 5.65 (1.30) | 5.61 (1.21) | −0.07 (0.42) |
| Heat intolerant | 5.62 (1.57) | 5.65 (1.48) | 0.05 (0.68) |
† Mann–Whitney U test was used (medians and interquartile range of the raw data are reported); * Independent samples t-test was used (mean and SD of the raw data are reported); RV: Reference value; CK: creatine kinase; ALT: alanine transaminase; AST: aspartate transaminase; ∆: change. ‡ Reference values from AU480 Chemistry Analyzer, Beckman Coulter instructions for use. a significant difference (p < 0.05) between heat-tolerant and heat-intolerant groups at pre-test; b- significant difference (p < 0.05) in change from pre- to post-test between heat-tolerant and heat-intolerant groups.