Influence of the transition speed in kinematic variables measured with an inertial measurement unit.
Introduction: Race speed is one of the variables that most influences biomechanical and neuromuscular behavior. The kinematic parameters have been studied generally with speeds over 10,00 km / h or 2,77 m / s and not at low speeds located in the transitions from walk to run (5-8km / h or 1,38-2,22m / s respectively). The objective of the study was to determine the influence of career speed on career run transition ranges on the kinematic variables Pronation Excursion and Pronation Velocity, obtained with a low-cost IMU for 60 seconds on a treadmill. Methods: A total of 40 non-symptomatic male participants (age 19,86 ± 1,02 years; body mass 70,58 ± 5,54 kg, BMI 23,45) voluntarily attended the study and performed two race conditions randomly assigned by a software These corresponded to running in a treadmill for 60 seconds at 5km / h and 8km / h without inclination. The subject was not informed when the IMU was read. Results: For the kinematic variables Pronation Excursion (º) and Pronation Velocity (º / s) compared in two speed conditions (5km / h and 8 km / h) statistically significant differences were found (p <0,05) with Cohen effect size large (> 0,8) for Pronation Velocity (° / s) and moderate for Pronation Excursion (º) Conclusions: The results suggest that changes in transition speed of 5km / h at 8km / h generate significant kinematic adaptations in the Pronation Excursion variables (º) and Pronation Velocity (º / s) evaluated with a low cost IMU. Clinicians are suggested to assess these variables when re-educating careers.