Vibroarthrographic analysis of patellofemoral joint arthrokinematics during squats with increasing external loads

Table 2 Parameters of vibroarthrographic signals under different loads

	VMS [V] median ± variance		R4 [V] median ± variance		P1 [V²/Hz] median ± variance		P2 [V²/Hz] median ± variance
	Left	Right	Left	Right	Left	Right	Left	Right
No load (L0)	0.001 ± 0.004	0.004 ± 0.019	2.06 ± 1.24	1.93 ± 1.62	1.77 ± 1.51	1.72 ± 2.49	0.57 ± 0.88	0.57 ± 1.08
10 kg load (L10)	0.009 ± 0.021	0.009 ± 0.026	3.00 ± 1.92	2.82 ± 2.00	2.92 ± 2.62	2.80 ± 3.92	1,03 ± 1,24	0.89 ± 1.24
20 kg load (L20)	0.029 ± 0.060	0.026 ± 0.051	4.41 ± 3.27	4.38 ± 2.85	6.60 ± 7.37	7.63 ± 8.10	2.16 ± 2.56	2.28 ± 254
p-values
L0 vs L10	0.019	0.005	0.008	0.003	0.027	0.031	0.006	0.007
L10 vs L20	0.102	0.019	0.044	0.032	0.006	0.002	0.031	0.009
L0 vs L20	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001

VMS variability of the mean squares calculated in 5 ms windows; R4, mean of four maximal and four minimal values; P1, P2, power spectral density bands: 50–250 Hz and 250–450 Hz, respectively; bolded values indicate statistically significant differences

ISSN: 2052-1847