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Assessing Reflex Latencies in Responses to Vibration: Evidence for the Involvement of More Than One Receptor

  • Ilhan Karacan
  • Kemal S. TürkerEmail author
Chapter
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Abstract

This chapter describes a new method for pinpointing the latency of the vibration-induced muscular reflex. To determine the reflex latency, the vibration-altered electromyography (EMG) and acceleration data were spike triggered and averaged using the tip of the EMG response as the trigger. Averaged results belonging to several different vibration frequencies were then superimposed to achieve a ‘cumulative averaged record’. The lowest standard error of the cumulative averaged record for the acceleration data was marked to indicate the effective stimulus point on the vibration cycle. Similarly, the lowest standard error of the cumulative averaged record for the EMG data showed the start of the reflex response. The time between the effective stimulus point and the start of the reflex response on EMG data was designated as the ‘reflex latency’ of this circuit. Using this technique, we have examined the latency of whole-body vibration (WBV)-induced reflexes. We found that the WBV induced two different reflex responses depending on the vibration amplitude. While low amplitude WBV (0.1–0.4 mm) produced short latency reflex similar to muscle spindle-based T-reflex (34 ms), high amplitude vibration (1.1–2.8 mm) generated long latency reflex response (44 ms) which may have a different receptor origin than the spindles. We have also summarized the modulatory effects of vibration on spindle-based reflexes and indicated that these reflexes are reduced during and/or following vibration. It is suggested that this effect may originate from the reduction in effectiveness of the spindle synapses on motoneurons via premotoneuronal means.

Keywords

Spinal Reflex Latency Excitability Motoneuron Inhibition 

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Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  1. 1.Istanbul Physical Therapy Rehabilitation Training and Research HospitalIstanbulTurkey
  2. 2.Koç University School of MedicineIstanbulTurkey

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