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NCT06384872
The main purpose of this project is to investigate the influence of cushioning material at both the rear and the forepart of running shoes on musculoskeletal complaints in leisure-time runners. Therefore, the objectives are to investigate if 1. "Extra soft" cushioning materials can reduce injury risk compared to stiffer materials; 2. Cushioning under the forepart of the shoe also influences injury risk, independently of the cushioning at the rear part; 3. Effects of cushioning material and position depend on the runner's body mass; 4. Perception of cushioning is related to both shoe cushioning and injury risk; 5. Other weight-bearing locomotion activities (i.e., number of steps per day besides running practice) represents an independent risk factor for running-related injury. This study consists in a 6-month intervention trial during which leisure-time runners are required to follow their usual training schedule. Before the beginning of the study, the participants will receive a pair of running shoes. The three running shoe models will be exactly the same, except for their foam properties at the rear and forepart of the shoe, which will differ by 33 and 37%, respectively. The study shoes will be administered through random allocation. The participants will be required to use these shoes for all running sessions, and only for running activities. Participants will first fill out a baseline questionnaire. During the intervention, data on running practice will be downloaded from sports watches via their respective app. Information on the use of the study shoes will be collected via a weekly questionnaire. Participants will be asked to fill out a weekly questionnaire on any musculoskeletal complaints experienced during the past 7 days. A questionnaire on the perception of cushioning will be filled in by the participants at three time points (after 5h of running, 25h of running, and at the end of follow-up). Primary hypothesis: \- Greater shock absorption properties at the rear part of running shoes are associated with a lower injury risk in recreational runners. Secondary hypothesis: * Greater shock absorption properties under the forepart of the shoe are also associated with lower injury risk in recreational runners. * Runners with low body mass experience a lower injury risk in shoes with greater shock absorption properties. * Greater perceived cushioning is related to lower injury risk.
NCT03115437
The main goal is to investigate the influence of shoe cushioning and body mass on the risk of running-related injury. This study will allow to determine if shoe cushioning needs to be adapted to the mass of the runner in order to minimize injury risk. The influence of shoe cushioning on running technique will also be investigated. This study consists in a 6-month follow-up period during which leisure-time runners are required to perform a running activity at least once a week and to upload all their running as well as other sporting activities onto a secured web-based training calendar named "Training and Injury Prevention Platform for Sports" (TIPPS) on a weekly basis. Any injury sustained during this period should also be uploaded onto the TIPPS system using the injury questionnaire provided on the website. Finally, the day of the visit to the laboratory (study start), their running style will be analysed during a 15-minute run on an instrumented treadmill at the participant's usual running speed. Anthropometric measurements will also taken. Before the beginning of the study, the participants will receive a pair of running shoes free of charge. These shoes will either have a soft or hard sole. Both shoe versions have cushioning properties that correspond to the range of values from the shoes available on the market. They will be administered through random allocation. Neither the participants nor the research team will know which shoe version was provided to the participant, in order to respect the double-blinded methodology of this study. The participants will be required to use these shoes for all running sessions, and only for running activities. Hypotheses: H1: Running shoes with greater stiffness are associated with a higher injury risk in leisure-time runners. H2: High body mass is associated with a higher injury risk in leisure-time runners. H3: Runners with a high body mass experience a lower injury risk in shoes with greater stiffness. H4: A higher step length, a lower step frequency, and higher peak vertical impact forces are associated with a higher injury risk. H5: Running shoes with greater stiffness will be associated with higher vertical impact peak forces and a shorter contact time. H6: High body mass will be associated with higher peak vertical impact forces, increased contact time, increased duty factor, and decreased step frequency.