TABLE 4.

Backhand technique assessment with the “Tennis rating score for children” at baseline, post intervention and 1-year follow-up.

	EG2				EG1				CG2				CG1
TRSC item	BDC	POST	FU	p-value	BDC	POST	FU	p-value	BDC	POST	FU	p-value	BDC	POST	FU	p-value
1a	2.2 ± 0.6	2.6 ± 0.5	4.2 ± 0.6*	<0.001	2.3 ± 0.5	2.5 ± 0.5	3.3 ± 0.5*	<0.001	2.4 ± 0.8	4.1 ± 0.7*	4.8 ± 0.4*	<0.001	2.1 ± 0.5	3 ± 0.6*	3.7 ± 0.5*	<0.001
1b	2.2 ± 0.8	2.9 ± 0.7*	4 ± 0.6*	<0.001	2 ± 0.5	2.7 ± 0.5*	3.5 ± 0.5*	<0.001	1.9 ± 0.8	3.1 ± 0.7*	4.2 ± 0.5*	<0.001	1.7 ± 0.5	2.7 ± 0.5*	3.5 ± 0.7*	<0.001
1c	1.5 ± 0.5	2.6 ± 0.5*	3.8 ± 0.6*	<0.001	1.5 ± 0.5	2.3 ± 0.5*	3.3 ± 0.4*	<0.001	1.8 ± 0.7	3.4 ± 0.8*	4.5 ± 0.8*	<0.001	1.5 ± 0.5	2.6 ± 0.5*	3.5 ± 0.4*	<0.001
2a	2 ± 0.6	2.8 ± 0.8*	4 ± 0.8*	<0.001	2.3 ± 0.5	2.9 ± 0.4*	3.5 ± 0.5*	<0.001	2.2 ± 0.8	3.3 ± 0.8*	4.3 ± 0.8*	<0.001	1.9 ± 0.7	2.7 ± 0.5*	3 ± 0.30.3	<0.001
2b	1.9 ± 0.5	3.7 ± 0.5*	4.7 ± 0.5*	<0.001	1.9 ± 0.4	3 ± 0.4*	3.5 ± 0.5*	<0.001	1.8 ± 0.6	3 ± 0.4*	3.9 ± 0.5*	<0.001	1.9 ± 0.4	2.3 ± 0.5*	3 ± 0.4*	<0.001
2c	2 ± 0.6	2.6 ± 0.7*	4.1 ± 0.7*	<0.001	2 ± 0.5	2.7 ± 0.5*	3.5 ± 0.5*	<0.001	1.8 ± 0.7	2.7 ± 0.5*	3.8 ± 0.4*	<0.001	1.9 ± 0.4	2.5 ± 0.5*	2.9 ± 0.6	<0.001
3a	2.4 ± 0.7	4.4 ± 0.5*	5 ± 0*	<0.001	2.4 ± 0.5	3.6 ± 0.5*	4.3 ± 0.4*	<0.001	2.4 ± 0.8	2.8 ± 0.4	3.8 ± 0.6*	<0.001	2 ± 0.6	2.3 ± 0.5	2.9 ± 0.4*	<0.001
3b	2 ± 0.6	2.8 ± 0.8*	3.9 ± 0.7*	<0.001	2.1 ± 0.6	2.9 ± 0.3*	3.8 ± 0.4*	<0.001	2 ± 0.9	2.9 ± 0.8*	3.9 ± 0.8*	<0.001	1.7 ± 0.5	2.3 ± 0.5*	3.1 ± 0.6*	<0.001
3c	2.3 ± 0.8	3.1 ± 0.5*	4.1 ± 0.5*	<0.001	2.3 ± 0.5	2.7 ± 0.5*	3.7 ± 0.4*	<0.001	2.5 ± 0.8	3.4 ± 0.5*	4.3 ± 0.5*	<0.001	2 ± 0.6	2.5 ± 0.5*	3.3 ± 0.5*	<0.001
4a	2.6 ± 0.8	2.8 ± 0.4	3.6 ± 0.5*	<0.001	2.5 ± 0.5	2.6 ± 0.5	3.4 ± 0.4*	<0.001	2.5 ± 0.8	3.7 ± 0.7*	4.7 ± 0.6*	<0.001	2 ± 0.6	2.9 ± 0.4*	3.7 ± 0.5*	<0.001
4b	1.7 ± 0.8	2.1 ± 0.5	3.2 ± 0.6*	<0.001	1.9 ± 0.8	2.3 ± 0.5*	3.3 ± 0.4*	<0.001	2.3 ± 0.8	3.8 ± 0.4*	4.8 ± 0.3*	<0.001	1.8 ± 0.4	2.9 ± 0.5*	3.7 ± 0.5*	<0.001
4c	2.6 ± 0.8	2.8 ± 0.4	3.5 ± 0.5*	0.001	2.8 ± 0.4	2.9 ± 0.5	3.2 ± 0.5	0.007	2.5 ± 0.8	3.7 ± 0.5*	4.6 ± 0.5*	<0.001	2.3 ± 0.7	2.8 ± 0.4*	3.6 ± 0.5*	<0.001
5a	2.2 ± 0.7	3.3 ± 0.5*	4.8 ± 0.4*	<0.001	2.3 ± 0.5	3.1 ± 0.3*	3.7 ± 0.5*	<0.001	2.3 ± 0.8	2.9 ± 0.3*	3.9 ± 0.3*	<0.001	1.9 ± 0.4	2.1 ± 0.3	3 ± 0*	<0.001
5b	1.8 ± 0.4	3.8 ± 0.4*	4.8 ± 0.4*	<0.001	1.9 ± 0.3	3.1 ± 0.5*	4 ± 0.5*	<0.001	1.8 ± 0.5	2.8 ± 0.4*	3.8 ± 0.4*	<0.001	1.9 ± 0.3	2.3 ± 0.5*	2.5 ± 0.5	0.001
5c	1.8 ± 0.4	3.9 ± 0.3*	4.9 ± 0.3*	<0.001	1.9 ± 0.4	3.3 ± 0.5*	4.2 ± 0.6*	<0.001	1.9 ± 0.5	2.7 ± 0.5*	3.6 ± 0.5*	<0.001	1.8 ± 0.4	2.1 ± 0.4	2.5 ± 0.5	0.001

EG2 – group with 2 exergame and 2 regular tennis trainings/week; EG1 – group with 1 exergame and 1 regular tennis trainings/week; CG2 – group 2 regular tennis trainings/week; CG1 – group with 1 regular tennis training/week; BDC – baseline; POST – post intervention; FU – Follow-up after 1 year; 1 = shot preparation: 1a = arm position, 1b = backswing, 1c = stance; 2 = acceleration: 2a = weight transfer, 2b = hitting motion, 2c = racquet path; 3 = point of contact: 3a = height, 3b = body position, 3c = sweet spot; 4 = follow through: 4a = end position, 4b = racquet position, 4c = non-dominant arm position; 5 = kinetic chain: 5a = sequence of activated body segments, 5b = fluidity, 5c = timing. *Significant different from the previous measurement at p < 0.017.