Age-Related Analysis of Body Postural Angles and Abdomen⋅Buttock Morphology in Korean Adult Women

In this study, we examined key sagittal and frontal postural angles, as well as abdomen–buttock lateral angles, across different age groups in 2,512 Korean women aged 20 to 69 who participated in the 8th Korean Anthropometric Survey. Our results revealed significant differences in all lateral postural angles among the age groups, with absolute angle values generally increasing with age. While changes in leg segment angles were relatively minor, the lateral pelvic angle demonstrated a notable increase in posterior pelvic tilt as age progressed. The upper-body angles, specifically the sagittal back–waist angle and neck–back angle, showed more pronounced age-related increases than the lower-body angles, with the neck–upper back region exhibiting the most significant flexion. All frontal postural angles also displayed significant variations among age groups. In the lower extremities, older age was associated with a genu varum pattern, resulting in outward deviation of the knees. Additionally, the shoulder droop angle increased with age, indicating a trend towards sagging shoulders. Our analysis of the abdominal and buttock shape angles revealed that as age advances, the abdomen tends to protrude anteriorly while the buttocks become flatter. This study provides valuable quantitative data on age-related changes in posture and abdomen–buttock morphology, which may inform age-specific clothing design.