BACKGROUND: A decrease in muscle mass, low motor performance, and normal lumbar spine bone mineral density (BMD) have been reported in children with Prader-Willi syndrome (PWS). However, these data are limited by the fact that PWS children (who have short stature) were compared to age-matched healthy or obese individuals of normal height. OBJECTIVE: The goal of the present study was to compare bone and muscle characteristics in PWS children to sex- and age- or height-matched healthy subjects. MATERIALS AND METHODS: The study population included 17 PWS children (ages 6.2 to 17.5 yr; nine girls) who were not treated with GH. The axial skeleton was analyzed at the lumbar spine using dual-energy x-ray absorptiometry, and the appendicular skeleton (radius and tibia) was evaluated using peripheral quantitative computed tomography. Muscle parameters (mass, size, and functional parameters) were measured by dual-energy x-ray absorptiometry, peripheral quantitative computed tomography, and jumping mechanography, respectively. RESULTS: Compared to height-matched controls, PWS patients had normal axial and appendicular BMD, as well as normal muscle size. Compared to age- or height-matched controls of normal weight, PWS patients had lower maximal muscle force and power relative to body mass during jumping. PWS patients had similar absolute maximal muscle force but lower absolute maximal power compared to age- or height-matched controls. Relationships between bone mass and muscle size and force were similar in PWS patients and in healthy subjects. CONCLUSION: Relative to their height, PWS patients not treated with GH had normal axial and appendicular BMD, muscle size, and muscle-bone relationships.
BACKGROUND: A decrease in muscle mass, low motor performance, and normal lumbar spine bone mineral density (BMD) have been reported in children with Prader-Willi syndrome (PWS). However, these data are limited by the fact that PWSchildren (who have short stature) were compared to age-matched healthy or obese individuals of normal height. OBJECTIVE: The goal of the present study was to compare bone and muscle characteristics in PWSchildren to sex- and age- or height-matched healthy subjects. MATERIALS AND METHODS: The study population included 17 PWSchildren (ages 6.2 to 17.5 yr; nine girls) who were not treated with GH. The axial skeleton was analyzed at the lumbar spine using dual-energy x-ray absorptiometry, and the appendicular skeleton (radius and tibia) was evaluated using peripheral quantitative computed tomography. Muscle parameters (mass, size, and functional parameters) were measured by dual-energy x-ray absorptiometry, peripheral quantitative computed tomography, and jumping mechanography, respectively. RESULTS: Compared to height-matched controls, PWSpatients had normal axial and appendicular BMD, as well as normal muscle size. Compared to age- or height-matched controls of normal weight, PWSpatients had lower maximal muscle force and power relative to body mass during jumping. PWSpatients had similar absolute maximal muscle force but lower absolute maximal power compared to age- or height-matched controls. Relationships between bone mass and muscle size and force were similar in PWSpatients and in healthy subjects. CONCLUSION: Relative to their height, PWSpatients not treated with GH had normal axial and appendicular BMD, muscle size, and muscle-bone relationships.
Authors: Ee-Cheng Khor; Bruce Fanshawe; Yue Qi; Sergei Zolotukhin; Rishikesh N Kulkarni; Ronaldo F Enriquez; Louise Purtell; Nicola J Lee; Natalie K Wee; Peter I Croucher; Lesley Campbell; Herbert Herzog; Paul A Baldock Journal: PLoS One Date: 2016-01-29 Impact factor: 3.240
Authors: I Duran; K Martakis; C Stark; E Alberg; C Bossier; O Semler; E Schoenau Journal: J Musculoskelet Neuronal Interact Date: 2017-09-01 Impact factor: 2.041