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Effect of achilles tendon vibration at adapting to different sensory conditions

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2019
Carlak, Renan Arda
The aim of the study is to investigate the effect of Achilles tendon vibration (ATV) on postural sway behavior and backward body tilt (fall) response at adapting to different sensory conditions. The effect of anticipation on postural responses during ATV is also examined. Two different somatosensory environments are created which are without and with bodily somatosensory (touch) cue, respectively. In these different sensory environments, bipedal quiet stand test is applied on a force platform in both eyes-open and eyes-closed conditions, in the absence and the presence of ATV, respectively. The experiments were conducted on two sports groups (handball players and swimmers) and one control group (sedentary subjects). Center of pressure value in antero-posterior direction (CoPx) was computed and used in data validation and interpretation of the results. The results showed that independent from the groups, ATV always altered the proprioceptive information resulting backward body tilt (fall) and an increase in postural sway at adapting to all designed sensory conditions. However, it was observed that the anticipation of the vibration reduced the effect of ATV. Furthermore, independent from the groups, the contribution of touch information to reduce the effect of ATV was found more than the contribution of visual information. The most interesting result of this study was that when visual and touch information were supplied together to the sensory negative feedback mechanism, inter-group differences in terms of postural responses during ATV were vanished.