Key result
Cyclic application of compression after cessation of 30 Hz vibration caused a persistent reduction in H-reflex excitability and postactivation depression for > 2.5 minutes.
Why the study?
Does compressive load combined with limb vibration inhibit the recovery of soleus H-reflex in healthy adults?
Does compressive load combined with limb vibration inhibit the recovery of soleus H-reflex in healthy adults?
Absolute Event Rate: 88% vs 88%
A combination of limb segment vibration and compression causes persistent reduction in H-reflex excitability, suggesting a potential nonpharmacologic method to modulate spinal reflex excitability after CNS injury.
May support nonpharmacologic H-reflex modulation in healthy adults; leaves open translation to CNS injury populations.
We investigated the effects of vertical vibration and compressive load on soleus H-reflex amplitude and postactivation depression. We hypothesized that, in the presence of a compressive load, limb vibration induces a longer suppression of soleus H-reflex. Eleven healthy adults received vibratory stimulation at a fixed frequency (30 Hz) over two loading conditions (0% and 50% of individual's body weight). H-reflex amplitude was depressed ∼88% in both conditions during vibration. Cyclic application of compression after cessation of the vibration caused a persistent reduction in H-reflex excitability and postactivation depression for > 2.5 min. A combination of limb segment vibration and compression may offer a nonpharmacologic method to modulate spinal reflex excitability in people after CNS injury.
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Tseng et al. (2017) studied Healthy adults (n=11). Vertical vibration and compressive load vs. 0% of body weight loading condition was evaluated on Soleus H-reflex amplitude and postactivation depression. Cyclic application of compression after cessation of 30 Hz vibration caused a persistent reduction in H-reflex excitability and postactivation depression for > 2.5 minutes.
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