A Cross-sectional Study Of Risk Factors Of Recreational Runners And The Arch Collapse After Long Distance Running And The Correction Effects

Objective: To describe the characteristics and the running-related injuries of recreational runners in China,and to evaluate possible associations among risk factors and set a multifactorial model of running-related injury.To investigate the effects of long distance running on foot posture,foot plantar pressure and kinematics before and after a half-marathon,and to investigate the effects of correcting arch collapse after running.Methods: PART 1: A cross-sectional self-filled questionnaire survey was conducted among 4006 recreational runners.The survry included basic information,running-related injuries in the past year,running habits,training plans,running psychology and other external factors.The aim is to investigate the risk facters and set a multifactorial model of running-related injury.PART2: 25 recreational runners participated in the blank test and the arch intervention test respectively.The aim was to observe the changes of foot posture index,plantar pressure and running kinematics index after half marathon running,and the effect of foot arch intervention on improving foot arch collapse.Results: PART 1: 1.The incidence rate of running-related injuries in the past year was 62.06% among recreational runners,and the main injuries were overuse injuries.The knee injuries and ankle injures was the most and the highest was ilitibial band syndrome.2.Male recreational runners had higher risk;previous injuries and high level were internal risk factors.Under the control of other risk factors,age and BMI index were less dangerous for running injuries.3.The external risk factors of unning shoes and orthosis were controversial as an external risk factor for running injuries.Different running surfaces and other sports were not risk factors.4.Running above 6 years,the running aim of "strengthening" and "relaxation ",warm-up and having a running coach were protective factors.PART 2: 1.After a long distance run,there was no difference in foot posture index.But the plantar pressure of the forefoot and the medial increased significantly,and the landing time deseased significantly.The knee flexion angle increased significantly in the sagittal plane separately at the initial heel landing and at mid-stance.Arch support intervention could deseased the change.Conclusions: PART 1: Recreational runners were mainly injured by overuse injuries.The previous injuries were the risk factor for running-related injuries.Running experience and positive attitude could reduce the occurrence of injuries.Large month volumn,short running years and high-level recreational runners may Increase risks.2.After long-distance running,the recreational runners had fatigue changes resulted the arch collapse and running kinematics changes.The arch support intervention played a preventive role.