Perceived thermal stress (Survey Response) Soccer players felt higher thermal stress when playing on artificial turf (AT) than natural turf (NT). Figure 3 (shown on the previous page) presents the frequency distributions of players' perceived level of surface temperature and thermal stress for AT and NT. Te X axis is the heat scores of perceived surface temperature (upper figure) and perceived thermal comfort (bottom figure), respectively. Tese values reflect how thermally comfortable they were on each field type during match. And the Y axis is the number of players choosing each score. Te upper histogram shows that AT has a relatively higher perceived surface temperature score with a broader range than NT. Te frequency distribution curve also indicates that the mean AT's heat score is 6 points which is one point higher than the mean NT's. Moreover, the heat score of the AT ranges between 4 to 7.5, which is slightly broader than that of the NT. Regarding the perceived thermal comfort, although the range of heat score range is identical as it ranges between 3 to 5, the mean AT score is at 4.3 points, which is higher than the mean NT score of 3.8.
Objective thermal stress (Energy budget model) Evaluation of thermal stress on natural and artificial turf