Can the Weight of an External Breast Prosthesis Influence Trunk Biomechanics during Functional Movement in Postmastectomy Women?

Table 2

Comparison between the right (R) and left (L) side mastectomy regarding the mean (SD) EMG activity of erector spine muscles during different phases (position tasks) for different types of breast prosthesis or no bra.

Position test	Type; prosthesis	Operated side: R	Nonoperated side: L	value	Operated side: L	Nonoperated side: R	value
Flex. relax. post. mean	A	51.24 (31.66)	60.6 (39.5)	0.039	50.02 (25.06)	51.54 (26.52)	0.647
	B	49.15 (32.35)	57.56 (42.92)	0.045	52.2 (24.36)	54.45 (28.36)	0.555
	C	50.75 (31.97)	59.49 (44.05)	0.05	52.01 (25.44)	48.44 (24.72)	0.16
	D	50.74 (33.61)	63.38 (47.31)	0.013	54.34 (25.04)	55.23 (30.63)	0.812
	value	0.997	0.976		0.954	0.854
Ext. post. mean	A	15.28 (15.58)	14.9 (13.14)	0.74	11.01 (5.9)	11.68 (6.27)	0.223
	B	11.38 (4.3)	12.12 (6.95)	0.568	11.15 (6)	12.32 (4.33)	0.167
	C	11.9 (4.79)	11.53 (6.59)	0.708	10.57 (7.66)	11.89 (4.82)	0.19
	D	12.17 (6.52)	12.78 (8.22)	0.53	13.51 (11.09)	12.65 (4.84)	0.726
	value	0.47	0.622		0.618	0.925
Trunk flex./ret. mean	A	42.98 (21.9)	45.53 (25.31)	0.417	42.57 (17.87)	42.68 (21.67)	0.961
	B	41.65 (24.26)	47.8 (29.18)	0.06	46.17 (19.6)	44.99 (22.35)	0.665
	C	39.75 (22.23)	46.36 (28.2)	0.066	44.9 (19.37)	42.82 (18.66)	0.484
	D	42.07 (23.06)	48.38 (30)	0.082	48.58 (19.18)	49.32 (26.19)	0.812
	value	0.97	0.986		0.766	0.744
Ext.-flex. ratio	A	3.52 (10.21)	3.09 (7.56)	0.443	1.55 (0.69)	1.48 (0.53)	0.278
	B	3.98 (12.28)	3.13 (8.35)	0.322	1.33 (0.56)	1.4 (0.64)	0.253
	C	4.05 (12.79)	3.51 (10.1)	0.353	1.4 (0.48)	1.42 (0.56)	0.813
	D	4.51 (15.02)	3.19 (8.77)	0.337	1.35 (0.55)	1.29 (0.52)	0.356
	value	0.995	0.998		0.579	0.739
Trunk flex./ret. mean	A	57.84 (27.07)	67.45 (37.11)	0.041	61.92 (26.59)	59.53 (29.14)	0.356
	B	55.3 (27.09)	63.88 (37.45)	0.09	57.09 (25.15)	57.34 (27.72)	0.927
	C	53.64 (22.45)	61.43 (31.87)	0.083	58.31 (23.56)	57.73 (29.73)	0.855
	D	51.39 (23.17)	57.81 (27.01)	0.147	60.95 (24.77)	59.39 (29.48)	0.498
	value	0.85	0.805		0.913	0.992
Rotation right mean	A	23.5 (12.96)	29.09 (18.07)	0.123	27.82 (11.64)	22.18 (9.48)	<0.001
	B	21.09 (8.23)	27.68 (17.88)	0.035	30.15 (11.96)	24.79 (11.21)	0.006
	C	22.08 (8.75)	28.85 (17.24)	0.023	29.23 (11.37)	24.47 (9.93)	0.008
	D	23.11 (10.93)	28.3 (17.41)	0.092	28.68 (10.22)	25.2 (9.69)	0.03
	value	0.867	0.994		0.92	0.758
Rotation left mean	A	25.84 (17.14)	25.55 (16.81)	0.94	23.82 (10.13)	26.56 (12.18)	0.159
	B	22.78 (11.32)	26.56 (17.04)	0.224	26.34 (9.61)	27.09 (9.15)	0.667
	C	23.02 (10.25)	25.31 (17.5)	0.469	23.51 (10.24)	28.16 (12.11)	0.029
	D	24.64 (11.07)	27.37 (19.16)	0.44	23.49 (8.7)	28.45 (11.19)	0.024
	value	0.836	0.979		0.725	0.938
Lat. flex. left mean	A	18.87 (15.3)	19.48 (13.87)	0.83	16.85 (7.83)	19.81 (7.18)	0.082
	B	15.62 (7.92)	19.14 (13.07)	0.128	17.88 (6.61)	20.35 (8.13)	0.033
	C	16.4 (8.46)	18.87 (13.19)	0.248	18.96 (8.49)	20.54 (8.69)	0.233
	D	17.47 (9.93)	20.09 (16.91)	0.327	19.42 (7.51)	22.65 (8.77)	0.015
	value	0.768	0.993		0.688	0.679
Lat. flex. right mean	A	18.62 (13.72)	20.66 (17.05)	0.512	20.85 (9.48)	18.33 (6.68)	0.036
	B	16.76 (7.39)	21.82 (16.28)	0.058	21.47 (9.81)	19.17 (7.54)	0.051
	C	17.8 (9.04)	20.78 (14.6)	0.168	20.28 (9.47)	19.84 (9.28)	0.639
	D	18.08 (9.14)	21.3 (17.28)	0.267	20.1 (8.52)	21.94 (8.81)	0.182
	value	0.941	0.995		0.962	0.501