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Do running and fatigued running relate to tibial stress fractures?

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dc.contributor.advisor Bay, Brian K.
dc.creator Sasimontonkul, Siriporn
dc.date.accessioned 2012-05-04T16:32:23Z
dc.date.available 2012-05-04T16:32:23Z
dc.date.copyright 2004-08-25
dc.date.issued 2004-08-25
dc.identifier.uri http://hdl.handle.net/1957/29003
dc.description Graduation date: 2005 en_US
dc.description.abstract Tibial stress fractures are common in runners. However, it is unclear what factors are associated with tibial stress fractures. This study aimed to investigate 1) magnitudes of bone contact forces occurring while running 2) whether or not repeated application of running loads is sufficient to explain tibial stress fractures and 3) whether or not muscle fatigue alters the potential of tibial stress fractures. Tibial stress fractures were predicted through an estimation of the minimum number of cycles to failure (Nfail) using an integrated experimental and mathematical modeling approach. Short running trials within a speed range of 3.5-4 m/s of ten male runners were evaluated with a coupled force plate and 3 dimensional motion analysis system. The collected data were used to estimate joint reaction forces (JRF) and joint moments. Using these JRF and muscle forces predicted from optimization, 2-D bone contact forces at the distal end of the tibia were determined. Next, tibial stresses were estimated by applying these bone contact forces to a tibial model, which were then used to predict the Nfail. All procedures were repeated after plantarflexors fatigued from prolonged running. This study found that peaks of compressive and posterior shear forces occurred during mid stance, and these peaks equaled 8.91 ± 1.14 BW and -0.53 ± 0.16 BW, respectively. These bone contact forces led to a backward bending of the tibia during most of the stance phase and resulted in the maximum stresses of - 43.4 ± 10.3 MPa on the posterior face of the tibia. These maximum stresses predicted the group mean of Nfail as being 5.28*10⁶ cycles. However, 2.5% to 56% of population of runners have a chance of getting tibial stress fractures within 1 million cycles of a repeated foot impact. Within the context of muscle force and stress estimation procedures used in this study, Nfail appeared to increase after fatigue, not decrease as we hypothesized. en_US
dc.language.iso en_US en_US
dc.subject.lcsh Stress fractures (Orthopedics) en_US
dc.subject.lcsh Tibia -- Wounds and injuries en_US
dc.subject.lcsh Running injuries en_US
dc.subject.lcsh Leg -- Muscles -- Physiology en_US
dc.title Do running and fatigued running relate to tibial stress fractures? en_US
dc.type Thesis/Dissertation en_US
dc.degree.name Doctor of Philosophy (Ph. D.) in Exercise and Sport Science en_US
dc.degree.level Doctoral en_US
dc.degree.discipline Health and Human Sciences en_US
dc.degree.grantor Oregon State University en_US
dc.contributor.committeemember Reed, Marjorie
dc.contributor.committeemember Widrick, Jeff
dc.contributor.committeemember Harter, Rod
dc.contributor.committeemember Schuyler, Michael
dc.contributor.committeemember Pavol, Mike
dc.description.digitization File scanned at 300 ppi (Monochrome, 8-bit Grayscale) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR. en_US
dc.description.peerreview no en_us

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