Document Type : Original article
Authors
1
Department of Sport Biomechanics, Faculty of sport science, University of Birjand , Birjand, Iran
2
Assistant Professor, Department of Sport Biomechanics, Faculty of Sports Sciences, University of Birjand, Birjand, Iran
3
Department of sport sciences, faculty of physical education and sport sciences, University of Birjand, Birjand, Iran
10.22037/sjrm.2024.117282.3262
Abstract
Background and Aims: The purpose of this study is to assess the kinetic parameters and muscle activation involved in the Anticipatory Postural Adjustment Phase of gait initiation in individuals with and without chronic ankle instability (CAI).
Materials and Methods: Twenty participants, 10 per group, voluntarily participated in this study. They were asked to initiate gait after the auditory cue while standing on the force plate. The muscle activity of the tibialis anterior (TA), soleus (SL), biceps femoris (BF), rectus femoris (RF), peroneus longus (PL), gluteus medius (Gmed), and gluteus maximus (Gmax) in both (left and right) legs, along with force parameters (in three directions) and center of pressure (in two directions) were measured for two groups. The dependent variables were analyzed by using independent T-tests.
Results: The findings indicate that there were no statistically significant differences in some of the muscles (P>0.05); though notable significant differences were observed in the kinetic parameters and muscle activations of TA_r, BF_L and SL_L muscles between two groups. The outcomes suggest that during the APA phase, individuals with CAI exhibit decreased muscle activities in TA_r and SL_r, and increased muscle activities in BF_L muscle compared to the Control group. These changes, aimed at maintaining body stability, suggest alterations in the patterns of neural transmission from the central nervous system (CNS).
Conclusion: Since the APA phase is regulated by the secondary motor area, alterations in motor control observed in those with CAI could be attributed to changes in supraspinal. Neuromuscular training for muscles which influence motor control strategies affected by CAI may be a beneficial way of the rehabilitation program for these individuals.
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