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

Table 2

Time duration of particular phases during topspin forehand in the entire group of players ()—means, standard deviations (SD), variations (V), and coefficients of variation (CV).

Variable	Topspin forehand
	Ph1	Ph2	Ph3	Ph4	TT
Mean (s)	0.5	0.1	0.2	0.4	1.5
SD (s)	0.1	0.0	0.0	0.1	0.0
V	0.0	0.0	0.0	0.0	0.0
CV (%)	18.3	46.2	18.2	25.7	1.4

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.