Neuromuscular response of hip-spanning and low back muscles to medio-lateral foot COP manipulation during gait
Deborah Solomonow-Avnon et al. Journal of Electromyography and Kinesiology
The purpose of this study was to investigate the effects of medio-lateral foot center of pressure manipulation on muscle activity of hip-spanning and back muscles during gait in bilateral hip osteoarthritis patients.
Methods: Foot center of pressure was shifted along the mediolateral foot axis using a foot-worn biomechanical device allowing controlled center of pressure manipulation. Sixteen female bilateral hip osteoarthritis patients underwent electromyography analysis while walking in the device set to three parasagittal configurations: neutral (control), medial, and lateral. Seven hip-spanning muscles (Gluteus Medius, Gluteus Maximus, Tensor Fascia Latae, Rectus Femoris, Semitendinosis, Biceps Femoris, Adductor Magnus) and one back muscle (Erector Spinae) were analyzed. Magnitude and temporal parameters were calculated
Results: Significant changes were observed in five out of eight muscles that were measured. Most changes were observed between the neutral position and the medial position of the biomechanical elements, with an increase in muscle activity in a medial position. In addition, differences were also found between the more symptomatic hip and the less symptomatic hip. Higher muscle activation was seen in the more symptomatic hip compared to the less symptomatic.
Conclusions: Medio-lateral foot center of pressure manipulation significantly affects neuromuscular pattern of hip and back musculature during gait in female hip bilateral osteoarthritis patients
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