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Table 1 Values of measured parameters during all circuits and races

From: Speed ratio but cabin temperature positively correlated with increased heart rates among professional drivers during car races

Race

HR (bpm)

Average driving time (min)

Highest HR ≥190 beat min−1 (n)

Mean speed ratio (%)

Cabin temperature (°C)

Cabin humidity (%)

Track condition

2011 (Jul) Rd.4 Sugo (9)

170.4 ± 13.1

47.8 ± 11.1

6 (67 %) of 9

91.1 ± 1.3

30.7 ± 4.1

54.0 ± 10.0

Dry

2011(Aug) Rd.5 Suzuka (9)

147.0 ± 16.9

59.1 ± 11.0

0 (0 %) of 9

81.6 ± 1.8

34.4 ± 3.2

61.6 ± 11.2

Wet

2011 (Sep) Rd.6 Fuji (10)

166.3 ± 19.6

43.5 ± 9.1

6 (60 %) of 10

93.4 ± 0.8

39.3 ± 3.1

42.6 ± 5.6

Dry

2011 (Oct) Rd.7 Autopolis (6)

165.3 ± 11.1

40.5 ± 11.9

1 (17 %) of 6

92.2 ± 1.0

NA

NA

Dry

2011 (Oct) Rd.8 Motegi (9)

171.7 ± 14.5

49.7 ± 6.6

5 (56 %) of 9

94.3 ± 0.5

38.6 ± 1.1

43.5 ± 3.0

Dry

2012 (Apr) Rd.1 Okayama (9)

169.2 ± 9.4

59.8 ± 11.0

4 (44 %) of 9

93.9 ± 0.6

26.5 ± 2.8

27.6 ± 3.5

Dry

2012 (May) Rd.2 Fuji (8)

165.4 ± 11.5

57.5 ± 17.2

3 (38 %) of 8

92.1 ± 1.7

30.6 ± 1.8

47.9 ± 3.7

Dry

2012 (Jun) Rd.3 Sepang (9)

170.2 ± 11.8

51.9 ± 7.3

8 (89 %) of 9

94.8 ± 0.6

40.8 ± 3.5

42.6 ± 4.9

Dry

2012 (Jul) Rd.4 Sugo (8)

177.6 ± 5.7

50.8 ± 7.1

8 (100 %) of 8

93.8 ± 1.1

41.3 ± 5.5

43.4 ± 8.9

Dry

2012 (Aug) Rd.5 Suzuka (11)

160.7 ± 11.9

72.4 ± 8.8

7 (64 %) of 11

93.9 ± 1.3

41.8 ± 4.0

45.1 ± 6.4

Dry

2012 (Sep) Rd.6 Fuji (10)

168.1 ± 7.4

51.6 ± 15.3

5 (50 %) of 10

93.3 ± 0.6

40.9 ± 2.0

39.2 ± 5.8

Dry

2012 (Oct) Rd.7 Autopolis (10)

154.2 ± 18.4

58.6 ± 15.4

3 (30 %) of 10

90.9 ± 2.3

NA

NA

Wet

2012 (Oct) Rd.8 Motegi (8)

154.5 ± 14.2

48.9 ± 9.8

1 (13 %) of 8

88.1 ± 1.1

25.6 ± 0.6

58.7 ± 0.3

Wet

Total (116)

164.5 ± 15.1

54.2 ± 13.7

57 (48 ± 29 %) of 116

91.9 ± 3.7

36.9 ± 6.2

45.3 ± 10.9

 
  1. Values are shown as means or means ± standard deviation of the mean. Number in parentheses represent number of the drivers with complete measurements for that race
  2. Wet condition was defined as “there is water on a road surface due to rainfall”
  3. HR heart rate, Rd round, NA not available (Due to the technical problem to manage the measuring device for the Autopolis circuit, we were not able to measure cabin temperature in 2011 Rd.7 and 2012 Rd.7)