aBMD	Areal bone mineral density
AT	Aerobic training
BMI	Body mass index
CR	Caloric restriction
CTX	C-telopeptide of type I collagen
DXA	Dual-energy x-ray absorptiometry
EX	Exercise
GRECC	Geriatric Research, Education, and Clinical Center
P1NP	Procollagen of type 1 n-terminal propeptide
PRISMA	Preferred Reporting Items for Systematic reviews and Meta-Analyses
PTH	Parathyroid hormone
QCT	Quantitative computed tomography
RCT	Randomized controlled trial
RT	Resistance training
WL	Weight loss