axSpA	Axial spondyloarthritis
BASDAI	Bath Ankylosing Spondylitis Disease Activity Index
BASFI	Bath Ankylosing Spondylitis Functional Index
BASMI	Bath Ankylosing Spondylitis Metrology Index
BMI	Body mass index
CI	Confidence interval
CRP	C-reactive protein
DXA	Dual-energy X-ray absorptiometry
GL	Gastrocnemius lateralis
GM	Gastrocnemius medialis
ICC	Intraclass correlation coefficient
IL-17A	Interleukin-17A
IQR	Interquartile range
Lf	Fascicle length
MRI	Magnetic resonance imaging
MT	Muscle thickness
NSAID	Nonsteroidal anti-inflammatory drug
r-axSpA	Radiographic axial spondyloarthritis
SD	Standard deviation
SE	Standard error
SPSS	Statistical Package for the Social Sciences
STROBE	Strengthening the Reporting of Observational Studies in Epidemiology
TA	Tibialis anterior
TNF	Tumor necrosis factor
VL	Vastus lateralis