Table 3.
Validity and reliability of the GPS-system for each movement and the complete session including stationary phases.
Exercise
Distance Bias (%)
Distance SEE (% [CL])
Within-device distance TE (m [CL])
Within-device distance CV (% [CL])
Sideways
2.4
4.9 [3.8; 6.9]
3.2 [2.0; 7.1]
7.3 [4.7; 16.2]
Diagonal
-1.0
5.6 [4.2; 8.6]
3.6 [2.2; 8.7]
8.8 [5.5; 21.6]
Acceleration
-4.0
5.4 [4.3; 7.4]
2.8 [1.9; 5.3]
8.6 [5.8; 16.6]
Deceleration
0.0
4.3 [3.4; 6.0]
1.7 [1.2; 3.3]
4.9 [3.3; 9.4]
Backwards
-8.0
6.0 [4.6; 8.6]
3.4 [2.2; 7.6]
10.9 [7.0; 24.1]
Shuttle
2.5
3.4 [2.7; 4.6]
2.7 [1.9; 4.7]
4.6 [3.2; 8.1]
Skipping
-3.1
8.6 [6.6; 12.1]
5.4 [3.6; 11.0]
17.4 [11.5; 35.4]
Session
0.8
3.1 [2.2; 5.8]
6.7 [3.8; 25.1]
2.0 [1.2; 7.6]
SEE = standard error of the estimate; CL = 95% confidence limits; TE = typical error; CV = coefficient of variation.