IMMERSION OF LOWER BODY PARTS WITH COLD WATER REDUCES PHYSIOLOGICAL RESPONSES AND ENHANCES DISTANCE COVERED RUNNING IN HOT ENVIRONMENT

The purpose of the present study was to examined the effects of a 12-min cold water immersion(CWI) on each of, core temperature (Tc), oral temperature (To), heart rate (HR) and running distance covered performance in the second trial in a hot environment. Ten participant (mean age 30.5±5.54 years ; height 1.84.1±5.10 ; body mass 76.62± 9.48 kg,) completed two testing sessions separated by one week; each trial consisted two bouts of a 30-min running on hot condition (30.90°±1.28°C, 72.6±5.68% relative humidity). The two bouts were separated by either 22 min of seated recovery in the heat (non-CWI) or the same condition with 12-min CWI(mean 15±1°C (5th?17th minute). HR, Tc, To and distance in second bout were recorded throughout the testing sessions. There was a significant incline in performance-trial from Test1 to Test2 using CWI (7010 ± 495.92 m) compared to the change seen non-CWI (6887± 490.42). (Tc) was reduced following non-CWI (37.94 ±1.0ºC) compared with CWI (37.52 ± 0.4 ºC). The total HR during the non-CWI and CWI test was (96.50 ± 14.27pbm) (decline range 84.7 pbm) and (84 ± 9.84 pbm) (decline range 93.5pbm), respectively. (To) no deferent between non-CWI recovery (36.50±.318ºC) ,compared to the change seen CWI (36.50±.405ºC). 12-min cold-water immersion recovery significantly lowered (Tc) and maintained endurance performance during second test session . These data indicate that repeated exercise performance in heat may be improved when a short period of cold-water immersion is applied during the recovery period. Keywords Cold water immersion. Core temperature. Recovery .