Impact loading in female runners with single and multiple bone stress injuries during fresh and exerted conditions  

作　　者：Kristin L.Popp Jereme Outerleys Sarah Gehman Margaret Garrahan Sara Rudolph Elizabeth Loranger Kathryn E.Ackerman Adam S.Tenforde Mary L.Bouxsein Irene S.Davis 

机构地区：[1]Military Performance Division,United States Army Research Institute of Environmental Medicine,Natick,MA 01760,USA [2]Endocrine Unit,Massachusetts General Hospital,Harvard Medical School,Boston,MA 02114,USA [3]Department of Physical Medicine and Rehabilitation,Spaulding Rehabilitation Hospital,Harvard Medical School,Cambridge,MA 02138,USA [4]Department of Sports Medicine,Boston Children's Hospital,Harvard Medical School,Boston,MA 02115,USA [5]Center for Advanced Orthopedic Studies,Beth Israel Deaconess Medical Center,Harvard Medical School,Boston,MA 02215,USA

出　　处：《Journal of Sport and Health Science》2023年第3期406-413,共8页运动与健康科学（英文）

基　　金：supported in part by appointments to the Department of Defense Research Participation Program at the U.S.Army Research Institute of Environmental Medicine administered by the Oak Ridge Institute for Science and Education;support from the U.S.Department of Defense;Defense Health Program;Joint Program Committee(W81XWH-16-1-0652);the National Institutes of Health shared instrumentation grant(S10 RR023405)。

摘　　要：Background:Bone stress injuries(BSIs)are common in female runners,and recurrent BSI rates are high.Previous work suggests an association between higher impact loading during running and tibial BSI.However,it is unknown whether impact loading and fatigue-related loading changes discriminate women with a history of multiple BSIs.This study compared impact variables at the beginning of a treadmill run to exertion andthe changes in those variables with exertion among female runners with no history of BSI as well as among those with a history of single or multiple BSIs.Methods:We enrolled 45 female runners(aged 18-40 years)for this cross-sectional study:having no history of diagnosed lower extremity BSI(N-BSI,n=14);a history of 1 lower extremity BSI(1-BSI,n=16);and diagnosed by imaging,or a history of multiple(>3)lower extremity BSIs(M-BSI,n=15).Participants completed a 5-km race speed run on an instrumented treadmill while wearing an Inertial Measurement Unit.The vertical average loading rate(VALR),vertical instantaneous loading rate(VILR),vertical stiffness during impact via instrumented treadmill,and tibial shock determined as the peak po sitive tibial acceleration via Inertial Measurement Unit were measured at the beginning and the end of the run.Results:There were no differences between groups in VALR,VILR,vertical stiffness,or tibial shock in a fresh or exerted condition.However,compared to N-BSI,women with M-BSI had greater increase with exertion in VALR(-1.8%vs.6.1%,p=0.01)and VILR(1.5%vs.4.8%,p=0.03).Similarly,compared to N-BSI,vertical stiffness increased more with exertion among women with M-BSI(-0.9%vs.7.3%,p=0.006)and 1-BSI(-0.9%vs.1.8%,p=0.05).Finally,compared to N-BSI,the increase in tibial shock from fresh to exerted condition was greater among women with M-BSI(0.9%vs.5.5%,p=0.03)and 1-BSI(0.9%vs.11.2%,p=0.02).Conclusion:Women with 1-BSI or M-BSIs experience greater exertion-related increases in impact loading than women with N-BSI.These observations imply that exertion-related changes in gait biomecha

关 键 词：BIOMECHANICS Bone stress injuries FATIGUE RUNNERS Stress fracture 

分 类 号：G822[文化科学—体育训练] R873[文化科学—体育学]