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Table 5 Results for normalised (%SMVC) amplitude EMG of the left musculature during functional tasks

From: Investigating differences in trunk muscle activity in non-specific chronic low back pain subgroups and no-low back pain controls during functional tasks: a case-control study

Task Muscle AEP FP Healthy Kruskal-Wallis Mann-Whitney U Pairwise Comprisons (Post hoc)
(*p < 0.05) (*p < 0.0167)
Number of trials Mean (SD) Number of trials Mean (SD) Number of trials Mean (SD)   
Step Down TrA/IO 21 78.8 (50.2) 24 74.7 (42.1) 25 76.3 (51.9) 0.948
EO 19 61.5 (39.7) 21 54.3 (22.7) 23 44.7 (23.4) 0.249
sLM 20 19.8 (14.8) 23 19.9 (17.7) 25 13.6 (9.1) 0.287
LT 16 22.7 (12.3) 23 22.7 (15.5) 25 22.8 (12.3) 0.933
Step Up TrA/IO 21 79.4 (55.4) 24 78.9 (43.5) 25 74.7 (58.0) 0.69
EO 19 60.5 (34.3) 21 54.7 (24.0) 23 42.6 (21.9) 0.1
sLM 20 20.2 (16.2) 23 19.7 (18.6) 25 12.7 (8.7) 0.218
LT 16 22.8 (10.9) 23 21.8 (15.3) 25 22.6 (13.3) 0.777
Reach Up TrA/IO 22 70.1 (55.9) 23 71.8 (40.4) 23 58.8 (47.0) 0.229
EO 19 52.6 (34.2) 21 53.2 (24.6) 23 41.9 (20.8) 0.252
sLM 20 19.6 (14.3) 23 19.0 (19.0) 25 13.6 (8.4) 0.38
LT 18 28.6 (17.2) 21 20.2 (15.5) 25 23.4 (14.8) 0.173
Pick Up Pen (Bend Down) TrA/IO 18 77.2 (60.4) 22 73.5 (46.1) 24 76.6 (52.6) 0.957
EO 18 56.6 (33.3) 21 56.8 (32.0) 23 42.2 (20.8) 0.277
sLM 18 25.1 (37.9) 23 18.8 (18.3) 24 14.5 (8.7) 0.812
LT 14 29.6 (36.7) 23 20.5 (15.7) 24 22.4 (13.2) 0.626
Pick Up Pen (Return) TrA/IO 18 75.4 (57.4) 22 74.6 (47.3) 21 64.8 (31.9) 0.869
EO 18 56.9 (3.8) 21 55.4 (31.0) 23 43.9 (22.3) 0.379
sLM 18 25.2 (37.2) 23 18.4 (18.1) 24 14.0 (8.4) 0.624
LT 14 29.2 (35.7) 23 20.9 (16.7) 24 22.1 (12.8) 0.572
Stand-to-Sit TrA/IO 18 60.0 (40.0) 23 76.5 (54.2) 22 39.5 (23.7) 0.02* FP vs H
EO 17 58.4 (36.9) 21 55.3 (23.4) 22 40.6 (22.2) 0.094
sLM 19 30.9 (20.8) 22 28.7 (17.1) 22 17.6 (15.4) 0.02* FP vs H
LT 15 45.0 (32.0) 22 33.2 (22.4) 23 38.6 (29.9) 0.427
Sit-to-Stand TrA/IO 19 56.0 (35.0) 23 62.6 (44.8) 23 36.7 (21.8) 0.044*
EO 17 52.6 (29.5) 21 53.7 (23.4) 22 39.2 (22.0) 0.115
sLM 17 17.1 (13.5) 22 19.6 (19.8) 23 12.3 (7.9) 0.427
LT 16 29.5 (19.0) 22 22.5 (16.0) 23 28.4 (19.7) 0.301
Box Replace TrA/IO 22 70.5 (39.0) 24 75.8 (41.1) 24 74.1 (63.9) 0.593
EO 19 57.8 (33.1) 21 54.3 (24.8) 23 42.7 (20.7) 0.251
sLM 21 23.4 (14.7) 24 21.0 (18.2) 24 15.1 (9.2) 0.132
LT 17 25.9 (14.6) 22 19.8 (16.2) 24 22.6 (12.9) 0.23
Box Lift TrA/IO 22 72.3 (39.3) 24 76.2 (42.6) 23 74.2 (60.8) 0.66
EO 19 60.0 (35.0) 21 55.4 (25.4) 23 42.5 (21.2) 0.129
sLM 21 23.6 (14.4) 24 20.5 (17.6) 24 15.1 (8.6) 0.123
LT 17 25.5 (13.4) 22 19.4 (15.2) 24 22.6 (13.9) 0.155
  1. Key: FP = Flexion pattern motor control impairment, AEP = Active extension pattern motor control impairment, H = Healthy, SD = Standard deviation, * = significant difference (p < 0.05), TrA/IO = Transversus Abdominis / Internal Oblique, EO = External Oblique, sLM = superficial Lumbar Multifidus, LT = Longissimus Thoracis (Erector Spinae)