Biomechanical and Developmental Perspectives on Upper Body Postural Adaptations Among School-Aged Children: A Comprehensive Narrative Review
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Abstract
Background: Upper-body postural deviations, including forward head posture, thoracic hyperkyphosis, rounded shoulder posture, and altered scapular positioning, are increasingly reported among school-aged children and adolescents. These adaptations emerge during a critical period of skeletal growth, neuromuscular maturation, lifestyle change, and increasing exposure to sedentary behavior. Although age, body mass index (BMI), physical activity, and school-related ergonomic factors have been individually associated with pediatric posture, integrated developmental and biomechanical explanations remain limited. Objective: This narrative review aimed to synthesize current evidence on how developmental maturation and BMI-related biomechanical loading influence upper-body postural adaptations, neck–shoulder muscle performance, and postural control in typically developing school-aged children and adolescents aged 6–18 years. Methods: A structured narrative literature search was conducted using PubMed, Scopus, and Google Scholar for English-language peer-reviewed studies published between 2010 and 2025. Eligible studies examined head, cervical, thoracic, shoulder, or scapular alignment; neck or shoulder strength; BMI or obesity; physical activity; sedentary behavior; or school-related postural exposures in school-aged populations. Cross-sectional, longitudinal, experimental, interventional, and review studies were considered. Approximately 65 studies were synthesized thematically according to developmental and biomechanical domains; no quantitative pooling or formal risk-of-bias scoring was performed because of methodological heterogeneity. Results: Evidence indicates that age-related growth influences cervical alignment, thoracic curvature, shoulder protraction, scapular positioning, and neck–shoulder strength through changing body proportions, spinal maturation, and evolving neuromuscular control. Elevated BMI was associated with anterior mass displacement, increased cervical–thoracic loading, thoracic hyperkyphosis, forward head posture, rounded shoulders, reduced relative muscular strength, and poorer postural stability. Sedentary behavior, screen exposure, low physical activity, asymmetric loading, and inadequate school ergonomics further reinforced maladaptive alignment patterns. Conclusion: Upper-body posture in school-aged children reflects a multifactorial interaction between developmental maturation, biomechanical loading, neuromuscular function, and behavioral exposure. Developmentally sensitive screening that integrates posture, BMI or body composition, physical activity, ergonomics, and functional strength assessment may support early prevention and targeted intervention
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