What question did this study set out to answer?

To investigate and compare the electrophysiological effects of focal vibration applied to the Achilles tendon versus the gastrocnemius muscle belly in healthy individuals.

January 1, 2014Annals of Rehabilitation MedicineOpen Access

Evaluating the Differential Electrophysiological Effects of the Focal Vibrator on the Tendon and Muscle Belly in Healthy People

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Authors

GLGangpyo LeeSeoul National University YCYung ChoUniversity of Alabama JBJaewon BeomSeoul National University

Discussion

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Implication

Experimental study demonstrates greater spinal reflex inhibition from muscle belly vibration than tendon stimulation in healthy volunteers, suggesting optimal targeting for spasticity rehabilitation.

Key Points

To investigate and compare the electrophysiological effects of focal vibration applied to the Achilles tendon versus the gastrocnemius muscle belly in healthy individuals.
Assessed 10 healthy volunteers undergoing focal vibratory stimulation (amplitude 65 µm at 70 Hz) across two consecutive target sites: the Achilles tendon and the medial gastrocnemius muscle belly.
Acquired the Hoffman reflex (H-reflex) seven times per session to record minimal reflex latency, maximal H-reflex amplitude (Hmax), maximal M-response amplitude (Mmax), Hmax/Mmax ratio (HMR), and vibratory inhibition index (VII).
Modeled electrophysiological changes relative to stimulation time and location using generalized estimating equations.
Minimal H-reflex latency showed no significant variation over time (χ² = 11.62, p = 0.07) or between anatomical sites (χ² = 0.42, p = 0.52).
Stimulation induced significant time-dependent reductions across both sites in Hmax (χ² = 53.74, p < 0.01), HMR (χ² = 20.49, p < 0.01), and VII (χ² = 13.16, p = 0.02), which reversed immediately after vibration stopped.
Vibration applied to the muscle belly produced significantly greater suppression than tendon stimulation, showing a 1.99-mV greater decrease in Hmax (χ² = 4.02, p = 0.04) and a 9.02% greater decrease in VII (χ² = 4.54, p = 0.03).

Cite This Study

Lee et al. (2014) studied this question.

synapsesocial.com/papers/6a95a1feb008990063cef980 https://doi.org/10.5535/arm.2014.38.4.494

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Implication

Experimental study demonstrates greater spinal reflex inhibition from muscle belly vibration than tendon stimulation in healthy volunteers, suggesting optimal targeting for spasticity rehabilitation.

Evaluating the Differential Electrophysiological Effects of the Focal Vibrator on the Tendon and Muscle Belly in Healthy People

Discussion

Member takes

Implication

Key Points

Cite This Study

Evaluating the Differential Electrophysiological Effects of the Focal Vibrator on the Tendon and Muscle Belly in Healthy People

Discussion

Member takes

Implication

Key Points

Cite This Study

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