Tyre Volume and Pressure Effects on Impact Attenuation during Mountain Bike Riding
Table 3
Mean ± SD for maximum magnitude (g2) 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
9.6649 ± 0.483
9.8169 ± 0.837
9.9169 ± 0.394
9.1121 ± 0.572
9.5915 ± 0.407
9.9974 ± 0.523
8.6000 ± 0.765
9.1403 ± 0.489
9.6618 ± 0.356
Tyre PSI A.Loc Tyre A.Loc PSI A.Loc
Wrist
8.9805 ± 0.969
9.2501 ± 1.016
9.3962 ± 0.698
8.4191 ± 0.744
8.6780 ± 0.770
9.1158 ± 0.944
8.0720 ± 0.897
8.8992 ± 1.092
8.5109 ± 0.374
Ankle
10.4872 ± 0.882
10.6966 ± 1.244
10.8250 ± 0.903
9.0277 ± 1.399
9.1134 ± 0.990
10.1514 ± 0.970
8.6496 ± 1.431
7.4320 ± 0.793
9.5862 ± 1.127
Seat post
8.5581 ± 0.596
8.8560 ± 1.009
8.8657 ± 0.831
8.5843 ± 1.097
9.1929 ± 0.997
9.5898 ± 0.936
8.1989 ± 1.407
8.9681 ± 1.375
9.2576 ± 0.977
Lumbar
0.9245 ± 0.201
1.0165 ± 0.315
0.9747 ± 0.279
0.9550 ± 0.198
0.9176 ± 0.129
0.9810 ± 0.169
0.8461 ± 0.094
0.9134 ± 0.124
0.9347 ± 0.138
Forehead
1.2333 ± 0.265
1.1829 ± 0.106
1.2301 ± 0.220
1.0693 ± 0.184
1.1935 ± 0.218
1.1763 ± 0.147
1.1001 ± 0.150
1.0876 ± 0.210
1.1283 ± 0.244
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 () and () for tyre size when compared to cycloXKing tyre; ⊗⊗⊗⊗ signifies a post hoc difference (), and () for tyre inflation pressure when compared to Low PSI and () compared to Mod. PSI.
