Using Wearable Inertial Sensors to Estimate Kinematic Parameters and Variability in the Table Tennis Topspin Forehand Stroke

Table 3

Variability (CV in %) of time duration of particular phases during topspin forehand in particular players (1-7).

Player	Topspin forehand
	Ph1	Ph2	Ph3	Ph4	TT
1	31.6	10.0	21.4	107.8	2.3
2	22.1	36.8	3.1	65.9	1.1
3	25.3	36.0	1.6	79.9	5.0
4	21.6	13.8	5.2	64.4	0.8
5	15.9	15.5	2.8	63.7	0.9
6	22.2	30.8	8.9	65.2	6.3
7	28.4	9.2	6.7	80.1	6.7

Ph1: Backswing; Ph2: Hitting; Ph3: Followthrough; Ph4; Back to Ready position; TT: total time of the cycle; Average variability. Small variability. Not marked CV: high and very high variability.