Tibial Acceleration and Spatiotemporal Mechanics in Distance Runners During Reduced-Body-Weight Conditions
| Autor: | Matthew F. Moran, Beau Kjerulf Greer, Brendan J. Rickert |
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| Rok vydání: | 2017 |
| Předmět: |
Male
medicine.medical_specialty Adolescent Acceleration Biophysics Physical Therapy Sports Therapy and Rehabilitation Context (language use) Accelerometer Body weight Running Young Adult 03 medical and health sciences Spatio-Temporal Analysis 0302 clinical medicine Accelerometry Tibial acceleration Humans Medicine Orthopedics and Sports Medicine Tibia Treadmill Orthodontics Impact acceleration business.industry Rehabilitation Outcome measures 030229 sport sciences Biomechanical Phenomena Cross-Sectional Studies Exercise Test Physical therapy Female business 030217 neurology & neurosurgery |
| Zdroj: | Journal of Sport Rehabilitation. 26:221-226 |
| ISSN: | 1543-3072 1056-6716 |
| Popis: | Context:Treadmills that unload runners via a differential air-pressure (DAP) bladder (eg, AlterG Anti-Gravity Treadmill) are commonly used to reduce effective body weight (BW) in a clinical setting. However, the relationship between the level of unloading and tibial stress is currently unknown.Objective:To determine the relationship between tibial impact acceleration and level of BW unloading during running.Design:Cross-sectional.Setting:University motion-analysis laboratory.Participants:15 distance runners (9 male, 6 female; 20.4 ± 2.4 y, 60.1 ± 12.6 kg).Main Outcome Measures:Peak tibial acceleration and peak-to-peak tibial acceleration were measured via a uniaxial accelerometer attached to the tibia during a 37-min continuous treadmill run that simulated reduced-BW conditions via a DAP bladder. The trial began with a 10-min run at 100% BW followed by nine 3-min stages where BW was systematically reduced from 95% to 60% in 5% increments.Results:There was no significant relationship between level of BW and either peak tibial acceleration or peak-to-peak tibial acceleration (P > .05). Both heart rate and step rate were significantly reduced with each 5% reduction in BW level (P < .01).Conclusions:Although ground-reaction forces are reduced when running in reduced-BW conditions on a DAP treadmill, tibial shock magnitudes are unchanged as an alteration in spatiotemporal running mechanics (eg, reduced step rate) and may nullify the unloading effect. |
| Databáze: | OpenAIRE |
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