Table 2 Correlations between physiological (ie, blood lactate concentration) and perceptual (ie, ratings of perceived exertion) values, and variables describing the characteristics of the game.

	RPE
	All games (n = 113)			Service games (n = 58)			Return games (n = 55)
	R	p Value	95% CI	R	p Value	95% CI	R	p Value	95% CI
SR	0.44	0.000	0.29 to 0.56	0.52	0.000	0.33 to 0.68	0.28	0.05	0.05 to 0.49
DR	0.39	0.000	0.24 to 0.52	0.50	0.000	0.30 to 0.66	0.30	0.04	0.07 to 0.50

	Blood lactate concentration
	All games (n = 53)			Service games (n = 27)			Return games (n = 26)
SR	0.57	0.000	0.37 to 0.72	0.80	0.000	0.62 to 0.90	0.26	0.25	−0.11 to 0.57
DR	0.51	0.000	0.30 to 0.68	0.80	0.000	0.62 to 0.90	0.28	0.21	−0.09 to 0.58

DR, duration of rallies; Lac, blood lactate concentration; RPE, rating of perceived exertion; SR, shots per rally.