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Dynamic Patterns of Forces and Loading Rate in Runners with Unilateral Plantar Fasciitis: A Cross-Sectional Study

Grant number: 15/20042-5
Support type:Regular Research Grants - Publications - Scientific article
Duration: October 01, 2015 - March 31, 2016
Field of knowledge:Health Sciences - Physiotherapy and Occupational Therapy
Principal researcher:Ana Paula Ribeiro
Grantee:Ana Paula Ribeiro
Home Institution: Universidade de Santo Amaro (UNISA). São Paulo , SP, Brazil

Abstract

Aim/Hypothesis: The etiology of plantar fasciitis (PF) has been related to several risk factors, but the magnitude of the plantar load is the most commonly described factor. Although PF is the third most-common injury in runners, only two studies have investigated this factor in runners, and their results are still inconclusive regarding the injury stage. Objective: Analyze and compare the plantar loads and vertical loading rate during running of runners in the acute stage of PF to those in the chronic stage of the injury in relation to healthy runners. Methods: Forty-five runners with unilateral PF (30 acute and 15 chronic) and 30 healthy control runners were evaluated while running at 12 km/h for 40 meters wearing standardized running shoes and Pedar-X insoles. The contact area and time, maximum force, and force-time integral over the rearfoot, midfoot, and forefoot were recorded and the loading rate (20-80% of the first vertical peak) was calculated. Groups were compared by ANOVAs (p<0.05). Results: Maximum force and force-time integral over the rearfoot and the loading rate was higher in runners with PF (acute and chronic) compared with controls (p<0.01). Runners with PF in the acute stage showed lower loading rate and maximum force over the rearfoot compared to runners in the chronic stage (p<0.01). Conclusion: Runners with PF showed different dynamic patterns of plantar loads during running over the rearfoot area depending on the injury stage (acute or chronic). In the acute stage of PF, runners presented lower loading rate and forces over the rearfoot, possibly due to dynamic mechanisms related to pain protection of the calcaneal area. (AU)

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
RIBEIRO, ANA P.; SACCO, ISABEL C. N.; DINATO, ROBERTO C.; JOAO, SILVIA M. A. Relationships between static foot alignment and dynamic plantar loads in runners with acute and chronic stages of plantar fasciitis: a cross-sectional study. BRAZILIAN JOURNAL OF PHYSICAL THERAPY, v. 20, n. 1, p. 87-95, JAN-FEB 2016. Web of Science Citations: 3.

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