Table 2.
Skeletal muscle measurements at baseline for total psoas and erector spinae muscle and for proximal, middle and distal muscle section. PDFF: proton density fat fraction, SD: standard deviation. * no SD due to logarithmic transformation.
| Muscle Measurements | Muscle Section | M. Erector Spinae, n = 55 | M. Psoas, n = 56 |
|---|---|---|---|
| Mean (SD, Range) | Mean (SD, Range) | ||
| PDFF, % | total muscle | 15.5 (*, 7.1–39.7) | 9.7 (*, 5.6–22.9) |
| proximal | 14.1 (6.6, 4.1–39.1) | 11.2 (3.8, 5.4–21.9) | |
| middle | 15.2 (6.8, 5.9–37.8) | 10.0 (3.5, 5.3–22.9) | |
| distal | 22.5 (7.9, 8.1–43.9) | 9.5 (4.0, 3.6–27.7) | |
| Muscle volume, mL | total muscle | 804.7 (*, 394.0–1588.9) | 294.1 (115.3, 108.0–601.5) |
| proximal | 214.0 (65.9, 93.9–371.5) | 75.0 (28.6, 33.3–151.1) | |
| middle | 418.5 (136.7, 189.3–799.7) | 166.7 (63.4, 59.3–335.8) | |
| distal | 212.7 (93.0, 71.6–565.2) | 52.4 (41.7, 10.5–202.7) | |
| Fat volume, mL | total muscle | 124.7 (*, 58.9–583.3) | 28.5 (11.1, 10.5–59.4) |
| proximal | 29.6 (17.4, 8.2–117.2) | 8.1 (3.4, 2.5–19.0) | |
| middle | 62.6 (41.0, 24.5–296.6) | 15.8 (5.8, 5.1–30.6) | |
| distal | 46.4 (25.7, 19.2–169.5) | 4.7 (4.8, 1.1–32.0) | |
| Contractile tissue volume, mL | total muscle | 706.6 (243.4, 307.2–1454.5) | 265.6 (108.9, 93.9–567.1) |
| proximal | 184.5 (60.9, 85.0–333.4) | 66.9 (26.8, 29.6–138.4) | |
| middle | 355.9 (121.8, 152.1–737.3) | 151.0 (60.0, 52.0–309.7) | |
| distal | 166.3 (79.1, 49.5–464.7) | 47.7 (37.7, 9.3–171.7) |