Table 1.
Group averages (mean value ± SD) from Dixon magnetic resonance imaging measurement of estimated muscle tissue volume and proton density fat fraction within the fascia of the first (M1) and second (M2) measurement used to determine short‐term repeatability
| Group | Estimated MT volume [cm3] | PDFF [%] | ||||
|---|---|---|---|---|---|---|
| M1 | M2 | M4 | M1 | M2 | M4 | |
| G1 | 250 ± 32 | 245 ± 26 | — | 6.9 ± 2.4 | 6.6 ± 1.8 | — |
| n = 23 | ||||||
| G3 | 253 ± 38 | 244 ± 20 | 257 ± 22 | 5.7 ± 1.4 | 5.6 ± 1.3 | 5.6 ± 1.4 |
| n = 7 | ||||||
| G2 | 160 ± 21 | 159 ± 22 | — | 19.3 ± 6.0 | 19.1 ± 6.2 | — |
| n = 24 | ||||||
| G4 | 160 ± 21 | — | 161 ± 22 | 18.6 ± 6.0 | — | 19.4 ± 6.1a |
| n = 23 | ||||||
Long‐term repeatability was determined from measurements M1 and M4 (13 weeks apart). G1: young, short‐term; G3: young, long‐term; G2: elderly, short‐term; G4: elderly, long‐term groups. MT, muscle tissue; PDFF, proton density fat fraction.
a
Significant difference between M1 and M4 results.