[Purpose] This study examined possible interrelationships between postural sway and
posture parameters in children and adolescents with a particular focus on posture
weakness. [Subjects and Methods] 308 healthy children and adolescents (124 girls, 184
boys, aged 12.3 ± 2.5 years) participated in the study. Posture parameters (posture index,
head protrusion, trunk inclination) were determined based on posture photos in the
sagittal plane. Postural sway was measured during 20 seconds on a force plate. The
Pearson’s product-moment correlation coefficients between the anthropometric and posture
parameters and the sway path length (SPL) were calculated, as well as the coefficient of
determination R2. [Results] There is a weak but significant correlation between
age or body mass index of the test subjects and the SPL. There is no statistically
significant correlation between posture parameters and the SPL. Children and adolescents
with posture weakness do not exhibit a changed SPL. [Conclusion] Therefore, therapy of
poor posture must be considered separately from therapeutic measures for the improvement
of balance skills.