Inactive | Moderately active | Active | P | |
---|---|---|---|---|
(0 days) | (1 to 8 days) | (9 to 14 days) | ||
N = 15 | N = 38 | N = 19 | ||
Age (years) * | 47.2 (1.3) | 45.1 (0.7) | 46.5 (1.5) | 0.29 |
Gender (n, % female) ** | 13 (86.7) | 26 (68.4) | 10 (52.6) | 0.11 |
Weight (kg) * | 99.0 (3.6) | 96.5 (2.1) | 84.4 (4.3) | 0.02 |
Height (m) * | 1.67 (0.01) | 1.67 (0.01) | 1.70 (0.02) | 0.21 |
BMI (kgm −2 ) * | 35.7 (1.3) | 34.8 (0.8) | 29.3 (1.5) | 0.002 |
Intervertebral disc height (L1 to S1) (mm) * | ||||
Average | 10.2 (4.1) | 10.6 (2.6) | 11.8 (3.6) | 0.01 |
Paraspinal muscle properties | ||||
CSA (cm 2 ) * | ||||
Multifidus | 6.9 (0.4) | 6.9 (0.3) | 7.2 (0.4) | 0.76 |
Erector spinae | 19.7 (1.1) | 20.5 (0.7) | 21.7 (1.0) | 0.41 |
High fat content, n (%) ** | ||||
Multifidus | 9 (60.0) | 13 (34.2) | 3 (15.8) | 0.03 |
Erector spinae | 5 (33.3) | 7 (18.4) | 1 (5.3) | 0.11 |
Chronic low back pain grade, n (%) *** | ||||
Pain free | 3 (20.0) | 6 (15.8) | 5 (26.3) | 0.049 |
Low disability, low intensity | 5 (33.3) | 24 (63.2) | 14 (73.7) | |
Low disability, high intensity | 4 (26.7) | 1 (2.6) | 0 (0.0) | |
High disability, moderately limiting | 1 (6.7) | 4 (10.5) | 0 (0.0) | |
High disability, severely limiting | 2 (13.3) | 3 (7.9) | 0 (0.0) | |
High pain/disability, n (%) *** | 7 (46.7) | 8 (21.1) | 0 (0.0) | 0.004 |