Table 3.

Subsequent analyses comparing age groups

	<40 vs 40-60		<40 vs >60		40-60 vs >60
	adj. p-value		adj. p-value		adj. p-value
Normalized RMS sEMG amplitude:
standing/80 % MVC	0.0132	*	<0.001	*	<0.001	*
halfflexion/80 % MVC	0.5237	ns	0.3351	ns	0.3351	ns
maximum flexion/80 % MVC	<0.001	*	<0.001	*	0.0032	*
Relative RMS sEMG amplitude changes between isometric positions (in percent):
standing – half flexion	0.8802	ns	0.0744	ns	0.0048	*
standing - maximum flexion	0.0168	*	0.1038	ns	0.5380	ns
half - maximum flexion	0.0038	*	<0.001	*	0.0139	*
Half Flexion Relaxation ratio (HFR):
half/maximum flexion	<0.001	*	<0.001	*	0.0217	*
Landmark positions (in degrees relative to the vertical):
mean standing TH4	0.1491	ns	0.5878	ns	0.5878	ns
mean standing L5	0.4736	ns	0.1035	ns	0.4736	ns
Changes in position angles (in degrees):
hip region (standing – maximum flexion)	0.0152	*	0.0072	*	0.5311	ns
lumbothoracic region (standing – maximum flexion)	<0.001	*	<0.001	*	0.0145	*
gross trunk region (standing – maximum flexion)	0.6002	ns	0.3105	ns	0.4220	ns
hip region (standing – half flexion)	<0.001	*	0.1096	ns	0.1357	ns
lumbothoracic region (standing – half flexion)	0.9999	ns	0.9999	ns	0.9999	ns
gross trunk region (standing – half flexion)	0.0756	ns	0.6012	ns	0.6012	ns
% hip of gross trunk region (half flexion)	<0.001	*	<0.001	*	0.0384	*
% lumbothoracic of gross trunk region (half flexion)	<0.001	*	<0.001	*	0.0429	*
% hip of gross trunk region (maximum flexion)	0.9999	ns	0.9999	ns	0.9999	ns
% lumbothoracic of gross trunk region (maximum flexion)	0.9999	ns	0.9999	ns	0.9999	ns

adj. p-value Holm adjusted p-value, *level of significance p < 0,05, ns not significant