An IoT-Based Motion Tracking System for Next-Generation Foot-Related Sports Training and Talent Selection

Table 1

Basic and morphology features.

Number	Symbol	Description
1		Root mean square (RMS) of y-axis acceleration
2		RMS of x-axis angular velocity
3		RMS of y-axis angular velocity
4		RMS of z-axis angular velocity
5		Variance of x-axis acceleration
6		Variance of y-axis acceleration
7		Variance of y-axis angular velocity
8		Maximum of x-axis acceleration
9		Maximum of y-axis acceleration
10		Minimum of y-axis acceleration
11		Minimum of y-axis angular velocity
12		Skewness of x-axis acceleration
13		Skewness of y-axis acceleration
14		Skewness of z-axis acceleration
15		Skewness of x-axis angular velocity
16		Skewness of y-axis angular velocity
17		Skewness of z-axis angular velocity
18		Interquartile range of x-axis acceleration
19		Interquartile range of y-axis acceleration
20		Interquartile range of z-axis acceleration
21		Interquartile range of x-axis angular velocity
22		Interquartile range of y-axis angular velocity
23		Interquartile range of z-axis angular velocity
24		Standard deviation of x-axis acceleration
25		Standard deviation of y-axis angular velocity
26		Mean value of pitch
27		Mean value of roll
28		Mean value of yaw
29		Root mean square of pitch
30		Root mean square of roll
31		Root mean square of yaw
32		Standard deviation of pitch
33		Standard deviation of raw
34		Standard deviation of yaw