Effects of Body Weight Loading on Arch Height

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Honors Theses

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https://ecommons.udayton.edu/uhp_theses/78; https://ecommons.udayton.edu/cgi/viewcontent.cgi?article=1078&context=uhp_theses
Bjelopetrovich, Anastasia
Medicine and Health Sciences; Other Medicine and Health Sciences; Physical Therapy
thesis / dissertation description
Deformation of the medial longitudinal arch under body weight loading is often assessed using the Arch Height Index Measurement System. This system assesses change in arch height between sitting and standing, estimated to be 10 and 50% of body weight, respectively. However, body weight forces during ambulation exceed these loads, therefore limiting our understanding of arch deformation under ambulatory load ranges. Thus, the study aims were 1) to assess if sitting and standing arch height differed from that seen under 10 and 50% body weight using a force target-matching procedure, and 2) to characterize the relationship between arch deformation and body weight loading throughout an ambulatory load range. Established sitting and standing arch height measurements were taken from 25 healthy subjects, who also underwent testing from 10 to 120% body weight loads in sequential 10% increments. Arch deformation in sitting was less than that of 10% body weight, whereas the standing and 50% condition did not differ. The incremental loading data revealed linear and curvilinear trends between arch deformation and loading through the ambulatory range, such that further deformation beyond that seen at 120% would be minimal using these procedures. These data suggest that sitting arch loads and deformation are less than those seen at 10% body weight, which affects known parameters such as arch stiffness. Further, the curvilinear trend in the arch height data suggests that most arch deformation occurs in the ambulatory load range for a healthy foot, and that greater static load magnitudes would deform the arch only minimally.