Studies using photon absorptiometry and magnetic resonance images.

aBMD =  Areal bone mineral density; ALG =  Active load group(swimming+waterpolo); Aprox =  Approximately; ARG =  Artistic gymnasts; B-ALP =  Bone specific alkaline phosphatase; BA =  Bone area; BAS =  Basketball; BMC =  Bone mineral content; BMAD =  Bone mineral apparent density; BMD =  Bone mineral density; BOD =  Body builders; BR =  Buckling ratio; BSI =  Bone strength index; CCS =  Cross country skiing; CG =  Control group; CG1 =  Post-menopausal control group for less than 5 years; CG2 =  Post-menopausal control group for more than 5 years; CLIM =  Climbing; CRU =  Collegiate runners; CRW =  Crew; CSA =  crosssectional area; CSMI =  Cross-sectional moment of inertia; CTX =  Type I collagen C-telopeptide; CYC =  Cyclists; DIS =  Discus throwers; DIV =  Divers; Dpd =  Deoxypyridinoline; ERU =  Endurance runners; ESW =  Endurance swimmers; F =  Female; FHO =  Field hockey; FIG =  Fighting; FNECK =  Femoral Neck; GYM =  Gymnasts; HIG =  High impact sports; HIL =  High impact sports (soccer, vollyball); HSA =  Hip structural analysis; ILG =  Impact load group; iPTH =  Intact parathormone; JAV =  Javelin throwers; JUM =  Jumpers; JUD =  Judoists; LDR =  Long distance runners; LSP =  Lumbar Spine; M =  Male; MED =  Medium impact (running and field hockey); Metatar =  Metatarsus; MMA =  Multiple mixed activities; MOD =  Moderate; MRI =  Magnetic resonance imaging; NTx =  Cross-linked N-telopeptides of type I collagen; OAT =  Older athletes: OC =  Osteocalcin; ODD =  Odd impact sports; OPG =  Osteoprotegerin; OTS =  Other practiced sports; PICP =  Procollagen type I C-peptide; PA =  Physical activity; PINP =  Procollagen type 1 N-terminal propeptide; Pyd =  Pyridinoline; POW =  Power lifters; REP =  Repetitive impact sports(running); ROW =  Rowing; RRU =  Recreational runners; RUG =  Rugby; RYG =  Rhytmic gymnastics; RUN =  Runners; SWI =  Swimmers; SWI1 =  Post-menopausal swimmers for less than 5 years ; SWI2 =  Post-menopausal swimmers for more than 5 years; SOC =  Soccer; SED =  Sedentary; SOF =  Softball; SPA =  Single photon absorptiometer; SPG =  Sport games; SRU =  Sprint runners; SSW =  Sprint swimmers; SYS =  Synchronized swimmers; THR =  Throwers; TRA =  Track; TEAM =  Team sports; TEN =  Tennis; TRI =  Triathletes; TROCH =  Trochanter; TSR =  Track sprinters; VOL =  Volleyball; W =  Women; WB =  Whole body; WBA =  Weight bearing activities; WBE =  Weight bearing sports; WLI =  Weight lifters; WPO =  Water polo; WTRI =  Wards triangle; Z =  Section modulus.