| Δ%CSA | percentage change of CSA between BDC and BR14 |
| Δ%Irisin | percentage change of irisin between BDC and BR14 |
| Δ%MVC | percentage change of MVC between BDC and BR14 |
| Δ%P0 | percentage change of P0 between BDC and BR14 |
| ΔCSA | absolute change of CSA between BDC and BR14 |
| ΔIrisin | absolute change of irisin between BDC and BR14 |
| ΔMVC | absolute change of MVC between BDC and BR14 |
| BCM | body cellular mass |
| BDC | baseline data collection |
| BMI | body mass index |
| BR | bed rest |
| BR14 | 14th day of bed rest |
| CCT | computerized cognitive training |
| CSA | cross-sectional area of fiber |
| F0 | isometric force of fiber |
| FFM | fat free mass |
| FM | fat mass |
| FNDC5 | membrane protein fibronectin type III domain-containing protein-5 |
| FNDC5ge | FNDC5 gene expression |
| MEP | maximal explosive power of lower limb |
| MM | muscle mass |
| MVC | maximal voluntary contraction of knee extensors |
| P0 | specific force of fiber |
| QMV | quadriceps femoris muscle volume |
| V0 | unloaded shortening velocity of fiber |
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