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Table 1 Physiological and performance data before and after heat acclimation training

From: Combined active and passive heat exposure induced heat acclimation in a soccer referee before 2014 FIFA World Cup

Measure

Pre (±SD)

Post (±SD)

Statistical significance or standardised difference score [d (90 % confidence interval)]

Probability (% chance) and qualitative statement

Resting plasma volume (% change)

0

7.1

 

NA

Sweat rate (L h−1)

 Performance trial

1.62

2.52

 

NA

 Fixed intensity trial

0.96

1.38

  

Performance trial

 Number of sprints

15

20

NA

NA

 Total distance covered (m)

2247

2897

NA

NA

 Mean speed (km h−1)

18.0 ± 1.0

17.6 ± 0.3

d = −0.46

[−1.09 to 0.17]

76 % less

 Mean thermal perception

8.5 ± 0.6

8.2 ± 0.4

P < 0.05

58 % less

 Mean RPE

17 ± 2

17 ± 2

P > 0.05

38 % similar

 Mean heart rate (beats min−1)

175 ± 8

178 ± 7

d = 0.31

[−0.32 to 0.95]

66 % greater

 Change in Tytemp (°C)

1.8

1.7

NA

50 % less

  1. Data are presented as mean average ± standard deviation (SD) where appropriate