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Excerpt
The purpose of the following study was to examine the practicality of WBGT relative to Tty in football players. Non-contact infrared thermometers used in all experiments. Tty was measured before practice (BP), after practice wearing full suit (FSP), and after practice wearing only shorts and a shirt (OSP), respectively. There was a high correlation between Tty and WBGT(Y=33.604+0.164X, r=0.760, p<0.001). Mean Tty rose in a step like fashion against WBGT. Tty was divided into five phases according to the WBGT; Phase 1(18-20 °C), Phase 2(21-24), Phase 3(25-27), Phase 4(28-30) and Phase 5(31°C). Significant differences were observed at the division points of each stage: WBGT 20 °C(36.94±0.43 °C) and 21(37.43±0.52); 24(37.46±0.35) and 25(37.73±0.35); 27 °C(37.83±0.32°C) and 28(38.45±0.50); 30(38.51±0.55) and 31(39.22±0.51), respectively. The division points of each stage were similar to the heat injury protection guidelines recommended by the ACSM. Significant differences in Tty among BP, FSP and OSP at Phases 1, 2, 3 and 4 were not observed. However, at stage 5, significant differences in Tty were observed between BP(38.98±0.42) and FSP(39.7±0.30). It was concluded that Tty rose in steps against WBGT. Therefore, WBGT is useful as an index for the prevention of heat injuries. We think that all sports practices should not be conducted at phase 4, and stopped at phase 5.
