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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)
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BMC Musculoskeletal Disorders

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