Clinical Trials Logo

Muscle Physiology clinical trials

View clinical trials related to Muscle Physiology.

Filter by:
  • Completed  
  • Page 1

NCT ID: NCT05478447 Completed - Vibration; Exposure Clinical Trials

Sympathetic Stress and Whole Body Vibration Reflex

Start date: September 9, 2022
Phase: N/A
Study type: Interventional

Whole body vibration (WBV) is a therapeutic modality in the form of exercise on a vibrating platform with an amplitude of 2-4 mm at a frequency of 25-50 Hz, which is used with increased popularity in sports medicine and rehabilitation due to its beneficial effects on muscle strength, balance, postural control, bone formation, and circulation. Beneficial effects on muscle strength and athletic performance have been reported. Spinal reflexes explain these beneficial neuromuscular effects. However, the neuronal circuit and receptors of the reflex response have not been defined precisely. A group of researchers propose that the reflex system underlying the neuromuscular effects of WBV is the Tonic vibration reflex (TVR), whose receptor is the muscle spindle; other researchers claim that the reflex latency induced by WBV is 4-5 ms longer than the TVR latency, so it is a bone myoregulation reflex whose receptor is osteocytes. The muscle spindle has sympathetic innervation. It has been reported that in case of increased sympathetic activity, muscle spindle sensitivity may increase and short-latency stretch reflex may be facilitated. The variation of muscle spindle activity with sympathetic activity may provide an opportunity to define the nature of the reflex response during WBV. Muscle spindles are more sensitive to vibrations around 100 Hz. This study has two hypotheses: According to the first hypothesis, WBV activates muscle spindles and the reflex latency induced by WBV is the same as TVR latency, and the latency does not change with increased sympathetic activity. According to the alternative hypothesis, WBV activates osteocytes, and WBV-induced reflex latency is longer than TVR latency. With increased sympathetic activity, the WBV reflex becomes dominant and the WBV-induced reflex latency becomes shorter. The aim of this research is to determine which of these two hypotheses is valid.

NCT ID: NCT05221541 Completed - Vibration; Exposure Clinical Trials

Feature of Reflex Pathway Activated by WBV and Voluntary Contraction

Start date: December 16, 2021
Phase: N/A
Study type: Interventional

Whole-body vibration (WBV) has beneficial neuromuscular effects on muscle strength increase. Supraspinal, spinal, and peripheral mechanisms have been proposed to explain these beneficial effects. The most commonly proposed explanatory mechanism is spinal segmental reflexes. However, the neuronal circuit and receptors of the reflex response have not been defined precisely. A group of researchers found that the reflex system is the Tonic vibration reflex (TVR) under the neuromuscular effects of WBV; Other researchers claim that WBV activates a different spinal reflex than TVR. Tonic vibration reflex is a polysynaptic reflex that occurs as a result of muscle spindle activation, in which more than 100 Hz vibrations are applied to the belly or tendon of the muscle. A group of researchers argues that WBV activates the spinal reflex response, but this reflex response is different from TVR. According to them, WBV-induced reflex (WBV-IR) response latency is longer than TVR latency. WBV activates TVR at very attenuated amplitude; WBV activates a different spinal reflex with longer latency at medium and high amplitude vibration. They reported that although the H-reflex, T-reflex, and TVR latency was longer in the spastic soleus muscle than normotonic soleus muscle, where the muscle spindle and Ia afferent pathway were hyperactive. However, the WBV-IR latency was similar in both spastic and normotonic soleus muscle. According to hypothesis of the present study , the reflex system activated by WBV changes depending on whether there is voluntary contraction or not: if the vibration is applied during voluntary contraction, the tonic vibration reflex is activated; In the absence of voluntary contraction (when the muscle is at rest), the bone myoregulation reflex is activated. The purpose of this research is to test this hypothesis.

NCT ID: NCT05209945 Completed - Vibration; Exposure Clinical Trials

Whole Body Vibration and Tonic Vibration Reflex

Start date: November 27, 2021
Phase: N/A
Study type: Interventional

Whole-body vibration (WBV) has beneficial neuromuscular effects on muscle strength increase. Supraspinal, spinal, and peripheral mechanisms have been proposed to explain these beneficial effects. The most commonly proposed explanatory mechanism is spinal segmental reflexes. However, the neuronal circuit and receptors of the reflex response have not been defined precisely. A group of researchers found that the reflex system is the Tonic vibration reflex (TVR) under the neuromuscular effects of WBV; Other researchers claim that WBV activates a different spinal reflex than TVR. Tonic vibration reflex is a polysynaptic reflex that occurs as a result of muscle spindle activation, in which more than 100 Hz vibrations are applied to the belly or tendon of the muscle. A group of researchers argues that WBV activates the spinal reflex response, but this reflex response is different from TVR. According to them, WBV-induced reflex (WBV-IR) response latency is longer than TVR latency. WBV activates TVR at very attenuated amplitude; WBV activates a different spinal reflex with longer latency at medium and high amplitude vibration. They reported that although the H-reflex, T-reflex, and TVR latency was longer in the spastic soleus muscle than normotonic soleus muscle, where the muscle spindle and Ia afferent pathway were hyperactive. However, the WBV-IR latency was similar in both spastic and normotonic soleus muscle. According to our hypothesis, the reflex system activated by WBV changes depending on vibration frequency: if the high-frequency (100-150 Hz) WBV is applied, the tonic vibration reflex is activated; if the low-frequency (30-40 Hz) WBV is applied, the bone myoregulation reflex is activated. The purpose of this research is to test this hypothesis.

NCT ID: NCT04567914 Completed - Clinical trials for Adolescent Idiopathic Scoliosis

Ultrasonographic Evaluation of Abdominal Muscle Thickness Symmetry and Correlation With Pulmonary Function

Start date: April 15, 2019
Phase:
Study type: Observational [Patient Registry]

We aimed in this study: 1. To compare the ultrasonographic measurements of the abdominal muscles thickness symmetry in patients with adolescent idiopathic scoliosis (AIS) and adolescent healthy individuals 2. To investigate the effect of measured thickness and symmetry on pulmonary function test.

NCT ID: NCT03932591 Completed - Muscle Physiology Clinical Trials

The Effect of Inhibitory Kinesio Taping Application on Spasticity, Stretch Reflex and Motor Neuron Activity

Start date: September 21, 2019
Phase: N/A
Study type: Interventional

The first aim of this study is whether the inhibitory kinesio taping application can reduce spasticity. The second aim of this study is to investigate whether the kinesio taping application have neuromodulatory activity on motor neuron and stretch reflex. Hypotheses of this study: unlike healthy cases, in patients with spastic hemiplegia 1. Inhibitory kinesio taping application can reduced spasticity 2. Inhibitory kinesio taping application can reduced motor neuron activity and stretch reflex

NCT ID: NCT03750799 Completed - Muscle Physiology Clinical Trials

Cross-training Effect of Whole-body Vibration

CTEWBW
Start date: November 12, 2018
Phase: N/A
Study type: Interventional

This study evaluates whether an increase in the ipsilateral knee flexor muscle strength transfers to the contralateral knee extensors which are not exposed to vibration, when unilateral-isolated whole body vibration (WBV) is applied to the lower extremity. In the half of volunteers the right leg were exposed vibration, while in the other half the right leg were exposed sham vibration. Muscle strength were measured with the Cybex® (Massachusetts, USA) extremity-testing system.

NCT ID: NCT02468011 Completed - Muscle Physiology Clinical Trials

Whole Body Vibration Induced Muscle Activity and Effect of the Changes in Length of Soleus Muscle and Angle of Ankle

WBVIMR-SL
Start date: June 2015
Phase: N/A
Study type: Interventional

Previous studies reported that myoelectrical activity increased during whole body vibration (WBV). The investigators hypothesized that the change in soleus muscle length does not affect the whole body vibration induced soleus reflex muscle activity but the change in ankle angle affects the whole body induced soleus reflex muscle activity. The purpose of this study is to test this hypothesis.