An inferential investigation into how stride length influences temporal parameters within the baseball pitching delivery |
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| Affiliation: | 1. Department of Exercise Science, School of Public Health and Health Professions, University at Buffalo, Buffalo, NY, USA;2. Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada;3. Department of Health Professions Education, D’Youville College Buffalo, NY, USA;1. Department of Orthopaedic Surgery, Wake Forest School of Medicine, Winston-Salem, NC, USA;2. Centre for Sport, Exercise and Osteoarthritis Research Versus Arthritis, University of Oxford, Oxford, UK;3. Department of Observational Clinical Research, ATI Physical Therapy, Greenville, SC, USA;4. University of South Carolina Center for Rehabilitation and Reconstruction Sciences, Greenville, SC, USA;5. Department of Orthopaedic Surgery, University of Colorado School of Medicine, Denver, CO, USA;6. Steadman Hawkins Clinic, University of Colorado Health, Englewood, CO, USA;7. Orthopaedic Surgery, Steadman Hawkins Clinic of the Carolinas, Greenville, SC, USA;1. Weill Cornell Medical College, New York, NY, USA;2. Sports Medicine Institute, Hospital for Special Surgery, New York, NY, USA;1. Midwest Orthopaedics at Rush, Rush University Medical Center, Chicago, Illinois, U.S.A.;2. Sports Rehabilitation & Performance Center, Hospital for Special Surgery, New York, New York, U.S.A.;3. Athletico, Chicago, Illinois, U.S.A.;1. Department of Physical Therapy, College of Health Professions, Grand Valley State University, Allendale, MI, USA;2. C-Motion, Inc., Germantown, MD, USA;3. Biomechanics & Movement Sciences, University of Delaware, Newark, DE, USA;4. Kinesiology and Applied Physiology, University of Delaware, Newark, DE, USA;5. Mechanical Engineering, University of Delaware, Newark, DE, USA;6. Biomedical Engineering, University of Delaware, Newark, DE, USA;7. Department of Kinesiology, Point Loma Nazarene University, San Diego, CA, USA |
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| Abstract: | Motion analyses of lower body mechanics offer new schemas to address injury prevention strategies among baseball pitchers, where the influence of stride length remains unknown. This study examined the temporal effect of stride length at constituent pitching events and phases. Nineteen competitive pitchers (15 collegiate, 4 high school) were randomly assigned to pitch two simulated, 80-pitch games at ±25% of their desired stride length. An integrated, three-dimensional motion capture system recorded each pitch. Paired t-tests were used to determine whether differences between stride conditions at respective events and within phases were significantly different. The results demonstrate the shorter strides mediated earlier onset of stride foot contact, reduced time in single support whereas double support intervals increased (p < .001). The opposite was observed with the longer strides. However, the acceleration phase, which comprises the highest throwing arm kinematics and kinetics, remained unchanged. The interaction between stride length, stride foot contact onsets, and time in single support is inferentially evidenced. The equivalent acceleration phases suggest stride length alone influenced time in single and double support by altering the onset of stride foot contact, which perhaps affects the mechanics in preparing the throwing arm for maximal external shoulder rotation. |
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| Keywords: | Throwing arm Overhand Shoulder Elbow Lower extremity |
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