Akademik Veri Yönetim Sistemi
2025 International Mechanical Engineering Congress and Exposition-IMECE, Tennessee, Amerika Birleşik Devletleri, 16 - 20 Kasım 2025, (Tam Metin Bildiri)
The dynamic mechanical response of the human foot during perturbations challenges the adequacy of conventional rigid-body models. This study investigates segmental shear deformation, postural sliding adaptation, and changes in structural rigidity during internally generated perturbations. Ten healthy adults (aged 25-30) performed controlled standing trials with voluntary anterior-posterior shifts while synchronized motion capture and force plate data were recorded. Markers on the calcaneus, navicular, and first metatarsal enabled quantification of intersegmental motion. Results showed that translational displacement between segments predominated over rotation, confirming shear deformation. A consistent anterior shift of the center of mass relative to the center of pressure reflected sliding adaptation. Variability in inter-segment distances indicated a dynamic reduction in structural rigidity. These effects were statistically significant and consistent across participants. Although the sample size was limited, power analysis confirmed sensitivity to large effects, supporting the exploratory nature of the study (Ethics approval No. 0344-ODTUIAEK-2025). Findings highlight the need to reconsider rigid-body assumptions in foot biomechanics and have direct implications for orthotic design and rehabilitation. This work provides a foundation for future research with larger cohorts and complementary neuromuscular measures.