Enhanced stretch reflex excitability of the soleus muscle in experienced swimmers

2008 ◽  
Vol 105 (2) ◽  
pp. 199-205 ◽  
Author(s):  
Tetsuya Ogawa ◽  
Gee Hee Kim ◽  
Hirofumi Sekiguchi ◽  
Masami Akai ◽  
Shuji Suzuki ◽  
...  
Keyword(s):  
Soleus Muscle ◽  
Stretch Reflex ◽  
Reflex Excitability

Enhanced stretch reflex excitability in the soleus muscle during passive standing posture in humans

2010 ◽  
Vol 20 (3) ◽  
pp. 406-412 ◽  
Author(s):  
Sachio Shimba ◽  
Noritaka Kawashima ◽  
Yuji Ohta ◽  
Shin-Ichiroh Yamamoto ◽  
Kimitaka Nakazawa
Keyword(s):  
Soleus Muscle ◽  
Stretch Reflex ◽  
Standing Posture ◽  
Reflex Excitability

Statistical Considerations When Assessing Short Latency Stretch Reflexes in the Human Soleus Muscle

Motor Control ◽  
2015 ◽  
Vol 19 (4) ◽  
pp. 253-270 ◽  
Author(s):  
Asger Roer Pedersen ◽  
Peter William Stubbs ◽  
Jørgen Feldbæk Nielsen
Keyword(s):  
Ankle Joint ◽  
Soleus Muscle ◽  
Stretch Reflex ◽  
Short Latency ◽  
Response Magnitude ◽  
Variance Heterogeneity ◽  
Stretch Reflexes ◽  
Response Characteristics ◽  
Normally Distributed

The aim was to investigate trial-by-trial response characteristics in the short-latency stretch reflex (SSR). Fourteen dorsiflexion stretches were applied to the ankle joint with a precontracted soleus muscle on 2 days. The magnitude and variability of trial-by-trial responses of the SSR were assessed. The SSR was log-normally distributed and variance heterogeneous between subjects. For some subjects, the magnitude and variance differed between days and stretches. As velocity increased, variance heterogeneity tended to decrease and response magnitude increased. The current study demonstrates the need to assess trial-by-trial response characteristics and not averaged curves. Moreover, it provides an analysis of SSR characteristics accounting for log-normally distributed and variance heterogeneous trial-by-trial responses.

Taurine Enhances Stretch Reflex Excitability

2019 ◽  
pp. 359-365
Author(s):  
Salvatore Rotondo ◽  
Rodina Sadek ◽  
Narmin Mekawy ◽  
Monir Arnos ◽  
Abdeslem El Idrissi
Keyword(s):  
Stretch Reflex ◽  
Reflex Excitability

scholarly journals Stretch Reflex Latencies in Spastic Hemiparetic Subjects are Prolonged After Transcutaneous Electrical Nerve Stimulation

1993 ◽  
Vol 20 (2) ◽  
pp. 97-106 ◽  
Author(s):  
Christina W.Y. Hui-Chan ◽  
Mindy F. Levin
Keyword(s):  
Nerve Stimulation ◽  
Transcutaneous Electrical Nerve Stimulation ◽  
Stretch Reflex ◽  
Time Course ◽  
Dorsal Column ◽  
Electrical Nerve Stimulation ◽  
Reflex Excitability ◽  
Reflex Threshold ◽  
Repetitive Electrical Stimulation

ABSTRACT:Low-intensity repetitive electrical stimulation such as dorsal column and transcutaneous electrical nerve stimulation (TENS) reportedly decreases spasticity and improves voluntary motor control. However, the mechanisms mediating these effects are unclear. Recent findings suggest that spasticity may be characterized more appropriately by a decrease in the stretch reflex threshold than by an increase in gain. Our objectives were: (1) to examine possible changes in stretch reflex excitability following 45 min of TENS, (2) to map out the time course of possible post-stimulation effects via both latency and magnitude (amplitude or area) measurements, and (3) to determine the role of segmental versus non-segmental mechanisms involved in mediating these changes. The effects of 45 min of segmentally and heterosegmentally applied TENS on lower limb reflexes in ten spastic hemiparetic subjects were contrasted with those resulting from placebo stimulation. We found that both segmentally and heterosegmentally applied TENS caused an immediate increase in soleus H reflex latencies that was evident for up to 60 minutes post-stimulation in over 75% of the subjects. Similar increases for up to 60 and 40 minutes post-stimulation was noted for the stretch reflex latencies in 50% and 67% of the subjects respectively for segmental and heterosegmental stimulation. These results suggested that manipulation of segmental and heterosegmental afférents for 45 min may lead to a decrease of the otherwise augmented stretch reflex excitability accompanying hemiparetic spasticity.

Different modulation pattern of spinal stretch reflex excitability in highly trained endurance runners

2012 ◽  
Vol 112 (10) ◽  
pp. 3641-3648 ◽  
Author(s):  
Tetsuya Ogawa ◽  
Noritaka Kawashima ◽  
Shuji Suzuki ◽  
Kimitaka Nakazawa
Keyword(s):  
Stretch Reflex ◽  
Reflex Excitability ◽  
Modulation Pattern ◽  
Endurance Runners ◽  
Spinal Stretch Reflex

Aging effects on posture-related modulation of stretch reflex excitability in the ankle muscles in humans

2012 ◽  
Vol 22 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Hiroki Obata ◽  
Noritaka Kawashima ◽  
Tatsuyuki Ohtsuki ◽  
Kimitaka Nakazawa
Keyword(s):  
Stretch Reflex ◽  
Aging Effects ◽  
Reflex Excitability ◽  
Ankle Muscles

Contribution of Afferent Feedback to the Soleus Muscle Activity During Human Locomotion

2005 ◽  
Vol 93 (1) ◽  
pp. 167-177 ◽  
Author(s):  
Nazarena Mazzaro ◽  
Michael J. Grey ◽  
Thomas Sinkjær
Keyword(s):  
Soleus Muscle ◽  
High Frequency ◽  
Stretch Reflex ◽  
Stance Phase ◽  
Human Locomotion ◽  
Ankle Dorsiflexion ◽  
Afferent Feedback ◽  
Tendon Vibration ◽  
Step Cycle ◽  
Peripheral Ischemia

During the stance phase of the human step cycle, the ankle undergoes a natural dorsiflexion that stretches the soleus muscle. The afferent feedback resulting from this stretch enhances the locomotor drive. In this study a robotic actuator was used to slightly enhance or reduce the natural ankle dorsiflexion, in essence, mimicking the small variations in the ankle dorsiflexion movement that take place during the stance phase of the step cycle. The soleus (SOL) and tibialis anterior EMG were analyzed in response to the ankle trajectory modifications. The dorsiflexion enhancements and reductions generated gradual increments and decrements, respectively, in the ongoing SOL EMG. We exercised care to ensure that the imposed ankle movements were too slow to elicit distinct burst-like stretch reflex responses that have been investigated previously. The increased SOL EMG after the dorsiflexion enhancements was reduced when the group Ia afferents were blocked with peripheral ischemia at the thigh, and during high-frequency Achilles tendon vibration. However, neither ischemia nor tendon vibration affected the decrements in the SOL EMG during the dorsiflexion reductions. These findings give evidence of the contribution of afferent feedback to the SOL activity in an ongoing basis during the stance phase. The results suggest that mainly feedback from the group Ia pathways is responsible for the increments in the SOL EMG during the dorsiflexion enhancements. However, the decrements in the SOL activity might be mediated by different afferent mechanisms.

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