Background. Long period of pre-cooling reduces heat stress and leads to performance improvement in warm environments. This study examined the effectiveness of the shorter period of pre-cooling using cold water immersing or cold shower exposure on hydration status and thermoregulation in the heat condition (temperature=32-34°C, humidity=50%).
Material and Method. Twenty four volunteer young male soccer players were randomly divided into three groups. The groups completed 45 minutes of treadmill running test either after warm up (non-pre-cooling group, n=8, VO2max, ml/kg/min=50.69± 5.68), or after warm up+ 10 minutes of cold water immersion (cold water immersion group, n=8, VO2max, ml/kg/min =50.62± 6.90), and or after warm up+ 2 minutes of cold shower (cold shower group, n=8, VO2max, ml/kg/min = 51.16± 5.92). Oral temperature, plasma lactate, K, and Na were measured at rest (pre test), after (mid test) warm- up or pre-cooling, and after exercise test (posttest). Plasma volume and dehydration were calculated using related formulas.
Results. Post test oral temperature and plasma lactate were significantly (P≺0.05) higher, while post test body weight was significantly (P≺0.05) lower than the pre test in the study groups. No significant differences between the three groups were found for oral temperature, plasma volume, dehydration status, plasma lactate, K and Na at the post test.
Conclusion. Based on these results, it can be said that there is no evidence for the positive effect of the short time pre-cooling methods on thermoregulation and dehydration during exercise in the heat condition. This trial is registered with Iranian Registry of Clinical Trial (IRCT) number IRCT2015121325503N1.
hot temperature, plasma volume, dehydration, body temperature, young soccer players
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