Biomechanical analysis of lifting on stable versus unstable surfaces—a laboratory-based proof-of-concept study

Table 2 Temporal variables. Mean total movement time and time in the two phases in cent seconds (cs). Median (min, max) (n = 28)

All weights	Stable			Slightly unstable			Unstable			Friedman
All weights	Median	Min	Max	Median	Min	Max	Median	Min	Max	p-value
Down	102	72	132	102	76	134	100	80	156	0.260
Up	150	82	171	135	89	171	142	84	172	0.552
Total	249	166	300	233	166	305	234	165	328	0.104
0 kg.	Stable			Slightly unstable			Unstable			Friedman
0 kg.	Median	Min	Max	Median	Min	Max	Median	Min	Max	p-value
Down	88	72	98	90	76	103	87	80	106	0.867
Up	143	82	171	130	89	166	140	84	154	0.964
Total	231	166	269	218	166	268	228	165	260	0.772
5 kg.	Stable			Slightly unstable			Unstable			Friedman
5 kg.	Median	Min	Max	Median	Min	Max	Median	Min	Max	p-value
Down	102	98	113	101	91	134	100	93	114	0.565
Up	142	94	171	144	100	171	132	100	149	0.630
Total	251	202	269	235	195	305	232	193	263	0.317
10 kg.	Stable			Slightly unstable			Unstable			Friedman
10 kg.	Median	Min	Max	Median	Min	Max	Median	Min	Max	p-value
Down	111	97	119	104	93	119	101	96	117	0.565
Up	151	104	170	136	96	171	150	108	170	0.317
Total	249	204	288	232	200	290	252	204	287	0.772
15 kg.	Stable			Slightly unstable			Unstable			Friedman	Wilcoxon Paired sign-rank (p-value)
15 kg.	Median	Min	Max	Median	Min	Max	Median	Min	Max	p-value	stable vs unstable	stable vs slightly unstable	slightly unstable vs unstable
Down	120	99	132	104	91	126	111	99	156	0.085	0.500	0.043	1.000
Up	152	110	168	151	94	168	154	95	172	0.630
Total	269	213	300	252	205	294	265	204	328	0.203

ISSN: 2055-5784