Table 2 Trunk muscle mass (TMM) measured using dual-energy X-ray absorptiometry (DXA) and cross-sectional areas (CSA) of each musculature measured using magnetic resonance imaging
|  | Men (n = 23) | Women (n = 25) | |
|---|---|---|---|
DXA-derived TMM (kg) | 23.8 ± 3.0 | 18.0 ± 2.3 | |
CSA of psoas major (mm2) | L2 | 1330 ± 459 | 665 ± 201 |
L3 | 2285 ± 591 | 1132 ± 270 | |
L4 | 3153 ± 698 | 1645 ± 415 | |
Sum of L2-4 | 6767 ± 1672 | 3441 ± 808 | |
CSA of back muscles (mm2) | L2 | 4856 ± 712 | 3267 ± 537 |
L3 | 5066 ± 695 | 3612 ± 569 | |
L4 | 4898 ± 656 | 4061 ± 484 | |
Sum of L2-4 | 14,820 ± 1912 | 10,941 ± 1487 | |
CSA of gluteus maximus (mm2) | 10,190 ± 1627 | 7947 ± 1411 | |