Effects of Stride Length and Running Mileage on a Probabilistic Stress Fracture Model

dc.contributor.author Edwards, W. Brent
dc.contributor.author Taylor, David
dc.contributor.author Rudolphi, Thomas
dc.contributor.author Gillette, Jason
dc.contributor.author Derrick, Timothy
dc.contributor.department Aerospace Engineering
dc.contributor.department Mechanical Engineering
dc.contributor.department Kinesiology
dc.date 2018-02-18T05:26:14.000
dc.date.accessioned 2020-06-29T22:46:14Z
dc.date.available 2020-06-29T22:46:14Z
dc.date.copyright Thu Jan 01 00:00:00 UTC 2009
dc.date.issued 2009-01-01
dc.description.abstract <p>The fatigue life of bone is inversely related to strain magnitude. Decreasing stride length is a potential mechanism of strain reduction during running. If stride length is decreased, the number of loading cycles will increase for a given mileage. It is unclear if increased loading cycles are detrimental to skeletal health despite reductions in strain. Purpose: To determine the effects of stride length and running mileage on the probability of tibial stress fracture. Methods: Ten male subjects ran overground at their preferred running velocity during two conditions: preferred stride length and 10% reduction in preferred stride length. Force platform and kinematic data were collected concurrently. A combination of experimental and musculoskeletal modeling techniques was used to determine joint contact forces acting on the distal tibia. Peak instantaneous joint contact forces served as inputs to a finite element model to estimate tibial strains during stance. Stress fracture probability for stride length conditions and three running mileages (3, 5, and 7 miles·d−1) were determined using a probabilistic model of bone damage, repair, and adaptation. Differences in stress fracture probability were compared between conditions using a 2 × 3 repeated-measures ANOVA. Results: The main effects of stride length (P = 0.017) and running mileage (P = 0.001) were significant. Reducing stride length decreased the probability of stress fracture by 3% to 6%. Increasing running mileage increased the probability of stress fracture by 4% to 10%. Conclusions: Results suggest that strain magnitude plays a more important role in stress fracture development than the total number of loading cycles. Runners wishing to decrease their probability for tibial stress fracture may benefit from a 10% reduction in stride length.</p>
dc.description.comments <p>This is a non-final version of an article published in final form in <em>Medicine & Science in Sports & Exercise </em>41 (2009): 2177, doi: <a href="http://dx.doi.org/10.1249/MSS.0b013e3181a984c4" target="_blank">10.1249/MSS.0b013e3181a984c4</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/aere_pubs/77/
dc.identifier.articleid 1076
dc.identifier.contextkey 9848585
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath aere_pubs/77
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/2080
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/aere_pubs/77/2009_Rudolphi_EffectsStride.pdf|||Sat Jan 15 01:52:39 UTC 2022
dc.source.uri 10.1249/MSS.0b013e3181a984c4
dc.subject.disciplines Biomedical Engineering and Bioengineering
dc.subject.keywords bone fatigue
dc.subject.keywords overuse injury
dc.subject.keywords tibia
dc.subject.keywords musculoskeletal model
dc.title Effects of Stride Length and Running Mileage on a Probabilistic Stress Fracture Model
dc.type article
dc.type.genre article
dspace.entity.type Publication
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