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Table 1 The consistency and accuracy scores of service and ground stroke before and after the simulated game in placebo and bicarbonate trials (mean ± standard deviation).

From: Sodium bicarbonate supplementation prevents skilled tennis performance decline after a simulated match

  Placebo Bicarbonate Main effect (P-value)
  Before After Before After Trial Time Interaction
Service (out of 20)        
   Accuracy 4.1 ± 1.8 4.5 ± 1.5 3.2 ± 2.6 3.8 ± 1.9 0.215 0.254 0.844
   Consistency 16.9 ± 5.4 11.1 ± 6.0 13.8 ± 5.1 13.6 ± 5.9 0.861 0.059 0.004**
Gs-Totala (out of 40)        
   Accuracy 5.5 ± 3.3 5.2 ± 2.5 6.0 ± 3.1 5.3 ± 2.2 0.758 0.446 0.694
   Consistency 19.5 ± 4.2 17.1 ± 4.3 17.6 ± 2.8 19.0 ± 4.5 1.000 0.575 0.088
Gs-Forehand (out of 20)        
   Accuracy 3.5 ± 1.5 2.7 ± 2.1 3.7 ± 1.9 2.3 ± 1.2 0.850 0.065 0.493
   Consistency 10.5 ± 2.8 9.1 ± 2.0 8.0 ± 1.6 9.3 ± 2.6 0.237 0.943 0.046*
Gs-Backhand (out of 20)        
   Accuracy 2.0 ± 2.1 2.3 ± 1.0 2.2 ± 1.8 1.8 ± 1.9 0.868 1.000 0.464
   Consistency 9.4 ± 2.7 8.0 ± 2.5 9.7 ± 2.7 9.5 ± 3.0 0.391 0.046* 0.475
  1. aGS: ground stroke; *p < 0.05, **p < 0.01; p < 0.05, before vs after in the same trial.