The aim of the study was to define the effect of different short-term metro-rhythmic stimulations on the time and spatial parameters of gait. The secondary goal was to test whether prior instructions on how to respond to stimulations played a significant role in the stimulation by sound stimuli. Experimental tests of gait were conducted on a group of 36 healthy participants: group 1—subjects who were not informed how to react after hearing sound stimuli, group 2—subjects who received a clear instruction before the test to adjust the frequency of taking steps to the rhythm of the music. The gait research was carried out on a Zebris FDM-S (zebris Medical Gmbh, Isny, Germany) treadmill for various sound stimuli (arrhythmic stimulus, rhythmic stimuli at different rate). It was shown that a short-term influence of metro-rhythmic stimulations changes the time and spatial parameters of gait, i.e., gait frequency, length and duration of the gait cycle. The greatest impact on the modification of the time–space parameters of walking is exerted by rhythmic stimuli at a pace different from the frequency of gait at a preferred velocity. Providing information on how to respond to sounds heard may be important in gait therapy with RAS (rhythmic auditory stimulation).
The research aimed to assess the effect of various types of metro-rhythmic stimulation and the manner of their application on gait symmetry in healthy individuals. Research-related tests involved a group of 22 adults without locomotor function disorders. The test participants were divided into two equal groups: group 1persons, who were not informed how to behave after hearing sounds (stimulation), group 2-persons instructed before a test to walk in the rhythm of music (stimulation). The tests of locomotor functions were performed using a Zebris FDM-S treadmill. All of the tests involving sound stimulation were performed for a preferable gait velocity. The analysis involved a change in the index of stepping time symmetry and the length of a step during gait with various types of sound stimulation (arrhythmic stimulus, rhythmic stimuli at a different rate). It was demonstrated that short-term rhythmic sound stimuli at the rate equal to stepping frequency at a preferable gait velocity affected the symmetrisation of stepping time in healthy adults, regardless of whether they had been informed how to react to stimulation. A short-term effect of the RAS on the symmetry of step length was not observed.
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