Fig. 3

Average heart rate and mean speed ratio under wet and dry conditions. Data from all races were compared wet (3 races, n = 27) and dry (10 races, n = 89) conditions using unpaired t test (a). Data from same three circuits and same three drivers were compared wet (3 races, n = 9) and dry (3 races, n = 9) conditions using paired t test (b). Data from outside air temperatures ranging from 14 to 17 °C were compared wet (2012 Round.7 and 2012 Round.8, n = 18) and dry (2011 Round.7 and 2012 Round.1, n = 15) conditions using unpaired t test (c). Unit of standard deviation a whisker bar represent 1 SD