Table 4. Na⁺ and K⁺ concentration before and after pre-cooling and at the end of exercise in a hot environment. Data are means ±SD, n = 7.

Variable	Control	Vest	Beverage	Mix
Na+ before (mmol/L)	137.71±1.38	137.86±1.35	137.43±1.81	137.43±1.51
Na+ after (mmol/L)	138.14±3.24	137.86±1.95	137.57±2.07	137.14±1.21
Na+ exhaustion (mmol/L)	140.14±1.68	139.14±2.61	138.43±2.37	138.14±1.86
K+ before (mmol/L)	3.72±0.17	3.69±0.08	3.71±0.11	3.71±0.16
K+ after (mmol/L)	3.89±0.16	3.85±0.24	3.85±0.17	3.82±0.09
K+ exhaustion (mmol/L)	4.00±0.18	3.93±0.23	3.90±0.17	3.87±0.20