Tyre Volume and Pressure Effects on Impact Attenuation during Mountain Bike Riding

Table 4

Mean ± SD for movements separated for low (<5 Hz) and high (>5 Hz) power.

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
Low power
handlebar	7.6020 ± 0.372	7.3377 ± 0.730	7.3461 ± 0.722	7.9999 ± 0.706	8.0373 ± 0.601	7.8545 ± 0.667	7.7180 ± 0.535	8.1915 ± 0.921	7.3545 ± 0.496	Tyre; A.Loc; Tyre A.Loc; PSI A.Loc
Wrist	11.1012 ± 1.433	11.1016 ± 0.798	10.8242 ± 0.665	11.2274 ± 0.783	11.3173 ± 0.791	11.1153 ± 0.940	10.7093 ± 0.831	11.2719 ± 1.111	11.1709 ± 1.481
Ankle	8.8034 ± 1.286	8.7661 ± 1.574	9.1143 ± 1.504	8.5389 ± 1.556	8.5304 ± 1.367	9.3778 ± 1.228	8.6588 ± 1.851	7.7914 ± 0.866	8.9735 ± 1.555
Seat post	7.0221 ± 0.892	6.9096 ± 1.130	6.9559 ± 1.100	7.7862 ± 0.844	7.7408 ± 0.802	7.6287 ± 0.682	7.4695 ± 0.979	8.1789 ± 1.595	7.5053 ± 0.870
Lumbar	2.2323 ± 0.428	2.2711 ± 0.431	2.2088 ± 0.555	2.3851 ± 0.393	2.3896 ± 0.385	2.4398 ± 0.512	2.1917 ± 0.240	2.1500 ± 0.199	2.2178 ± 0.242
Forehead	1.6805 ± 0.125	1.5723 ± 0.205	1.6235 ± 0.241	1.7659 ± 0.225	1.7505 ± 0.263	1.5788 ± 0.168	1.7763 ± 0.460	1.6319 ± 0.482	1.6620 ± 0.461
High power
handlebar	30.9527 ± 1.084	31.6942 ± 2.200	31.9095 ± 1.144	31.3476 ± 1.695	32.5003 ± 2.085	32.8681 ± 1.642	30.9170 ± 2.816	32.5744 ± 2.808	33.8956 ± 2.025	PSI; A.Loc; Tyre PSI; Tyre A.Loc; PSI A.Loc
Wrist	31.0326 ± 1.761	31.1862 ± 1.944	31.9101 ± 1.745	30.8851 ± 1.646	30.7399 ± 1.588	32.4736 ± 1.858	31.1031 ± 1.634	32.5217 ± 2.201	32.0763 ± 1.001
Ankle	32.0164 ± 2.753	30.7261 ± 1.813	30.8363 ± 1.935	29.4291 ± 1.562	29.7999 ± 1.962	31.1927 ± 1.746	29.9579 ± 4.112	28.7204 ± 1.748	32.5210 ± 2.184
Seat post	34.3183 ± 2.782	33.9910 ± 2.618	33.7490 ± 1.946	31.1456 ± 2.294	32.4106 ± 2.048	33.9546 ± 1.909	30.6605 ± 4.610	32.4129 ± 3.564	34.3646 ± 2.565
Lumbar	5.4080 ± 1.260	5.5831 ± 0.971	5.4496 ± 1.139	5.3255 ± 1.334	5.4598 ± 1.212	5.4818 ± 1.212	4.8842 ± 0.432	4.6912 ± 0.481	5.3320 ± 0.485
Forehead	5.5814 ± 1.397	6.2502 ± 0.620	5.8694 ± 0.998	4.9398 ± 1.083	5.0786 ± 1.423	5.3796 ± 1.525	5.7876 ± 1.741	4.6845 ± 0.808	5.9633 ± 1.570

Where tyre (tyre size), PSI (tyre inflation pressure), and A.Loc (accelerometer location) refer to the main effect for power band. Tyre A.Loc refers to the two-way interaction between tyre size and accelerometer location. denotes significance ();  (); () (); signifies a post hoc difference () for low power when compared to cycloXKing tyre size; ⊗⊗⊗⊗ signifies a post hoc difference () for tyre inflation pressure when compared to Low PSI and () compared to High PSI.