Tyre Volume and Pressure Effects on Impact Attenuation during Mountain Bike Riding
Table 2
Mean ± SD for maximum frequency (Hz) of accelerations during the trial, separated for accelerometer location, tyre size, and tyre inflation pressure.
Accelerometer position
CycloXKing tyre
2.2′′ XKing tyre
2.4′′ XKing tyre
3-way ANOVA
Low PSI
Mod. PSI
High PSI
Low PSI
Mod. PSI
High PSI
Low PSI
Mod. PSI
High PSI
Handlebar
0.5284 ± 0.049
0.5084 ± 0.046
0.5099 ± 0.060
0.5659 ± 0.043
0.5632 ± 0.036
0.5526 ± 0.036
0.5781 ± 0.029
0.6003 ± 0.055
0.5565 ± 0.032
Tyre PSINS A.Loc Tyre A.Loc
Wrist
0.5284 ± 0.049
0.5084 ± 0.046
0.5099 ± 0.060
0.5659 ± 0.043
0.5632 ± 0.037
0.5526 ± 0.037
0.5781 ± 0.029
0.6003 ± 0.055
0.5787 ± 0.076
Ankle
0.5284 ± 0.049
0.5084 ± 0.046
0.5099 ± 0.060
0.5659 ± 0.043
0.5632 ± 0.037
0.5526 ± 0.036
0.5781 ± 0.029
0.6003 ± 0.055
0.5787 ± 0.032
Seat post
0.5284 ± 0.049
0.5088 ± 0.036
0.5099 ± 0.036
0.5659 ± 0.043
0.5654 ± 0.036
0.5539 ± 0.036
0.5781 ± 0.029
0.6003 ± 0.055
0.5565 ± 0.032
Lumbar
0.8372 ± 0.760
0.8165 ± 0.756
0.5345 ± 0.123
1.3076 ± 1.168
1.8315 ± 1.034
1.6682 ± 1.453
2.0180 ± 1.421
1.3681 ± 1.034
1.4722 ± 1.166
Forehead
0.5749 ± 0.259
0.5088 ± 0.046
0.5099 ± 0.060
0.6518 ± 0.284
0.5202 ± 0.123
0.5098 ± 0.121
0.5749 ± 0.030
0.6049 ± 0.051
0.5117 ± 0.117
Tyre (tyre size), PSI (tyre inflation pressure), and A.Loc (accelerometer position) refer to the main effect for maximum frequency. Tyre A.Loc refers to the two-way interaction between tyre size and accelerometer position. NS denotes a nonsignificant effect (); (); signifies a post hoc difference () for tyre size when comparing cycloXKing to both 2.2′′ and 2.4′′ XKing tyre; ⊗⊗⊗⊗ signifies a post hoc difference () for accelerometer position when compared to all other accelerometer positions.
