INTRODUCTION:
The association of muscle fatigue to increased vertical ground reaction force imposes the risk of tibial stress fracture in sports like long-distance running and triathlon. Objective: To analyze and compare parameters of the vertical component of ground reaction forces and isokinetic muscle parameters of plantar flexion (PF) and dorsiflexion (DF) of the ankle between groups of distance runners and triathletes with and without a history of tibial stress fracture.
METHODS:
Seventy-five male long-distance runners and triathletes with a mean age of 30.26±6.51 years were divided according to the previous history of tibial stress fracture: fracture group (FG), composed 12 individuals with a history of stress fracture of the tibia and non-fracture group (NFG), composed of 37 individuals with no history of stress fracture of the tibia. The kinetic parameters were measured during the run through a force platform AMTI and isokinetic parameters through an isokinetic dynamometer Biodex (System 3).
RESULTS:
For all isokinetic variables and kinetics, there were no differences between FG and NFG.
CONCLUSION:
Although a difference in performance has not been identified between groups, the kinetic profile (impact) and isokinetic impact (muscle activity) shows that the running training with deficits in muscle condition care and control of extrinsic factors can create a risk of occurrence of stress fractures.
running; ankle; kinesis; athletes