As the no-mirror condition increased the demand on vestibular and proprioceptive feedback, this activation may have served to increase [alpha]-[gamma] co-activation and subsequently muscle spindle
sensitivity surrounding the ankle joint.
For the muscle spindle
measurements, images (magnification of 1000X) of the same muscle spindle
were captured in 10 different cuts per animal.
Some studies commented that low vibration frequency (5-45 Hz) has been efficient to increase EMG activity, muscle force, and power possibly by excitatory responses of the muscle spindle
enhance muscle activation that involve a spinal reflex mechanism (6,9,10).
Paraspinal muscle spindle
responses to the duration of a spinal manipulation under force control.
The receptor portion of the muscle spindle
is located midway between its ends where the intrafusal muscle fibres have no contractile element.
Histologic features were consistent with leiomyoma with the presence of smooth muscle spindle
cells without necrosis, atypical nuclei, or mitotic figures.
(1978) Muscle spindle
responses in man to changes in load during accurate position maintenance.
Evidence for presynaptic inhibition of muscle spindle
Ia afferents in man.
As ACE Certified News points out, "[T]his activation inhibits muscle spindle
activity, turning off neural and muscle activity to promote connective tissue elongation.
Whole body vibration (WBV) is a current neuromuscular training method, which even at a low intensity provokes muscle length changes that stimulate the sensory receptor of the muscle spindle
The mechanism of action of US for reduction of skeletal muscle spasm may rely on thermal effects that alter the skeletal muscle contractile process, reduce muscle spindle
activity, or break the pain-spasm-pain cycle (Michlovitz, 1990).
Boyd-Clark LC, Briggs CA and Galea MP (2002): Muscle spindle
distribution, morphology, and density in longus colli and multifidus muscles of the cervical spine.