Table 2.
Mean Annual FF Progression Rate per Muscle and Predicted Mean Value of FF at 40 Years Old
| Segment | ||
| Muscle | Mean annual FF progression rate (%) | FF value at 40 yo according to the model (%) |
| Thigh | 1.17 | 51.7 |
| Anterior compartment | ||
| VM | 1.14 | 48.8 |
| VL | 1.18 | 49.3 |
| VI | 1.18 | 51.9 |
| Posterior compartment | ||
| BF | 1.15 | 59.0 |
| SM | 1.14 | 67.0 |
| ST | 1.20 | 56.6 |
| Medial compartment | ||
| AM | 1.19 | 57.7 |
| Sar | 1.05 | 32.1 |
| Gra | 0.99 | 27.4 |
| Lower leg | 1.04 | 48.2 |
| Anterior compartment | ||
| ED | 1.11 | 30.3 |
| TA | 1.11 | 37.4 |
| Posterior compartment | ||
| TP | 1.11 | 34.1 |
| GL | 1.06 | 52.3 |
| Sol | 1.03 | 57.5 |
| GM | 0.96 | 58.1 |
| Lateral compartment | ||
| Per | 1.04 | 53.1 |
Abbreviations: AM = adductor magnus; BF = biceps femoris; ED = extensor digitorum muscles; FF = fat fraction; GM = gastrocnemius medialis; GL = gastrocnemius lateralis; Gra = gracilis; Per = peroneals; Sar = sartorius; SM = semimembranosus; Sol = soleus; ST = semitendinosus; TA = tibialis anterior; TP = tibialis posterior; VI = vastus intermedius; VL = vastus lateralis; VM = vastus medialis; yo = years old.