Table 5.

Effect of Whole-Body Cryostimulation on Energetic Cost of Specific Tennis Drills in National Tennis Players (Mean ± SD)

Tennis Drill	Variable	Group				Differences	P Value	F1,10	Effect Size, Partial η2	Test Power (α = .05)
		Cryostimulation		Control
		Before Study	After Study	Before Study	After Study
I	V˚O2max, mL·kg−1·min−1	61.0 ± 3.0	61.0 ± 3.0	60.6 ± 5.8	61.0 ± 3.0	None
	V˚O2 at 2 min, mL·kg−1·min−1	31.2 ± 3.4	31.8 ± 3.6	32.0 ± 7.4	32.8 ± 7.7	None
	V˚O2 at 6 min, mL·kg−1·min−1	49.3 ± 3.5	44.3 ± 2.5	48.5 ± 2.6	48.0 ± 2.4	Time	.003	14.41	0.59	0.927
						Group × time	.001	18.82	0.65	0.973
	ΔV˚O2,a mL·kg−1·min−1	18.2 ± 5.7	12.5 ± 4.9	16.5 ± 7.6	16.0 ± 7.6	Time	.0009	21.59	0.68	0.986
						Group × time	.002	15.25	0.60	0.938
	Heart rate, beats/min	170 ± 4	168 ± 2	177 ± 6	173 ± 7	Time	.009	10.30	0.51	0.824
	Stroke effectiveness, %	82.0 ± 6.0	88.0 ± 5.0	77.0 ± 4.0	79.0 ± 3.0	Time	.0003	28.59	0.74	0.997
						Group × time	.02	7.78	0.44	0.711
	Heart rate after 5-min rest, beats/min	113 ± 5	103 ± 7	119 ± 6	111 ± 5	Time	.0002	31.46	0.76	0.998
II	V˚O2 at 2 min, mL·kg−1·min−1	33.6 ± 3.7	33.5 ± 3.3	34.2 ± 6.7	34.1 ± 4.9	None
	V˚O2 at 6 min, mL·kg−1·min−1	52.5 ± 3.2	50.1 ± 3.7	51.0 ± 3.5	50.6 ± 2.3	Time	.04	5.24	0.34	0.543
	ΔV˚O2,a mL·kg−1·min−1	18.3 ± 5.4	16.6 ± 4.8	16.8 ± 5.6	16.5 ± 5.7	Time	.04	5.18	0.34	0.538
	Heart rate, beats/min	176 ± 3	168 ± 2.0	179 ± 4	173.0 ± 7	Time	.001	19.17	0.66	0.975
	Stroke effectiveness, %	84.0 ± 5.0	90.0 ± 6.0	78.0 ± 7.0	79.0 ± 7.0	Time	.001	19.28	0.66	0.976
						Group × time	.02	6.94	0.41	0.662
	Heart rate after 5-min rest, beats/min	115 ± 6	103 ± 7	119.0 ± 5	111.0 ± 6	Time	.0009	38.93	0.79	0.999
	Lactate at end of drill, mmol·L−1	5.8 ± 1.1	5.2 ± 0.6	6.0 ± 1.4	5.5 ± 0.9	None
	Lactate after 5-min rest, mmol·L−1	4.2 ± 0.7	2.8 ± 0.1	4.1 ± 0.9	3.3 ± 0.7	Time	.002	15.2	0.60	0.938