A new method to determine stretch reflex latency

2021 ◽  
Author(s):  
Betilay Topkara ◽  
Tugba Aydin ◽  
Mustafa Corum ◽  
Ayse Karaoglu ◽  
Dilara Ekici Zincirci ◽  
...  
Keyword(s):  
Stretch Reflex ◽  
New Method ◽  
Reflex Latency

scholarly journals A new method to determine reflex latency induced by high rate stimulation of the nervous system

2014 ◽  
Vol 8 ◽  
Author(s):  
Ilhan Karacan ◽  
Halil I. Cakar ◽  
Oguz Sebik ◽  
Gizem Yilmaz ◽  
Muharrem Cidem ◽  
...  
Keyword(s):  
Nervous System ◽  
New Method ◽  
High Rate ◽  
Reflex Latency ◽  
Stimulation Of

scholarly journals Muscle Stiffness and Spinal Stretch Reflex Sensitivity in the Triceps Surae

2008 ◽  
Vol 43 (1) ◽  
pp. 29-36 ◽  
Author(s):  
J. Troy Blackburn ◽  
Darin A. Padua ◽  
Kevin M. Guskiewicz
Keyword(s):  
Muscle Spindle ◽  
Stretch Reflex ◽  
Motor Response ◽  
Triceps Surae ◽  
Joint Stability ◽  
High Stiffness ◽  
Reflex Latency ◽  
Low Stiffness ◽  
Spinal Stretch Reflex ◽  
Musculotendinous Stiffness

Abstract Context: Greater musculotendinous stiffness may enhance spinal stretch reflex sensitivity by improving mechanical coupling of the muscle spindle and the stretch stimulus. This heightened sensitivity would correspond with a shorter latency and higher-amplitude reflex response, potentially enhancing joint stability. Objective: To compare spinal stretch reflex latency and amplitude across groups that differed in musculotendinous stiffness. Design: Static group comparisons. Setting: Research laboratory. Patients or Other Participants: Forty physically active individuals (20 men, 20 women). Intervention(s): We verified a sex difference in musculotendinous stiffness and compared spinal stretch reflex latency and amplitude in high-stiffness (men) and low-stiffness (women) groups. We also evaluated relationships between musculotendinous stiffness and spinal stretch reflex latency and amplitude, respectively. Main Outcome Measure(s): Triceps surae musculotendinous stiffness and soleus spinal stretch reflex latency and amplitude were assessed at 30% of a maximal voluntary isometric plantar-flexion contraction. Results: The high-stiffness group demonstrated significantly greater stiffness (137.41 ± 26.99 N/cm) than the low-stiffness group did (91.06 ± 20.10 N/cm). However, reflex latency (high stiffness = 50.11 ± 2.07 milliseconds, low stiffness = 48.26 ± 2.40 milliseconds) and amplitude (high stiffness = 0.28% ± 0.12% maximum motor response, low stiffness = 0.31% ± 0.16% maximum motor response) did not differ significantly across stiffness groups. Neither reflex latency (r = .053, P = .746) nor amplitude (r = .073, P = .653) was related significantly to musculotendinous stiffness. Conclusions: A moderate level of pretension (eg, 30%) likely eliminates series elastic slack; thus, a greater change in force per unit-of-length change (ie, heightened stiffness) would have minimal effects on coupling of the muscle spindle and the stretch stimulus and, therefore, on spinal stretch reflex sensitivity. It appears unlikely that differences in musculotendinous stiffness influenced spinal stretch reflex sensitivity when initiated from a moderate level of pretension. Consequently, differences in musculotendinous stiffness did not appear to influence dynamic joint stability with respect to reflexive neuromuscular control.

Influences of experimental factors on spinal stretch reflex latency and amplitude in the human triceps surae

2006 ◽  
Vol 16 (1) ◽  
pp. 42-50 ◽  
Author(s):  
J. Troy Blackburn ◽  
Richard G. Mynark ◽  
Darin A. Padua ◽  
Kevin M. Guskiewicz
Keyword(s):  
Stretch Reflex ◽  
Triceps Surae ◽  
Reflex Latency ◽  
Human Triceps Surae ◽  
Spinal Stretch Reflex

Selective Sampling and Orientation of Non-Homogeneous Tissues

1968 ◽  
Vol 26 ◽  
pp. 98-99
Author(s):  
C. C. Clawson ◽  
L. W. Anderson ◽  
R. A. Good
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Light Microscopy ◽  
Random Sampling ◽  
New Method ◽  
Microscope Examination ◽  
Small Areas ◽  
Selective Sampling ◽  
Large Numbers ◽  
Specific Orientation

Investigations which require electron microscope examination of a few specific areas of non-homogeneous tissues make random sampling of small blocks an inefficient and unrewarding procedure. Therefore, several investigators have devised methods which allow obtaining sample blocks for electron microscopy from region of tissue previously identified by light microscopy of present here techniques which make possible: 1) sampling tissue for electron microscopy from selected areas previously identified by light microscopy of relatively large pieces of tissue; 2) dehydration and embedding large numbers of individually identified blocks while keeping each one separate; 3) a new method of maintaining specific orientation of blocks during embedding; 4) special light microscopic staining or fluorescent procedures and electron microscopy on immediately adjacent small areas of tissue.

A new method for the determination of nitrates

1960 ◽  
Vol 23 ◽  
pp. 227-232 ◽  
Author(s):  
P WEST ◽  
G LYLES
Keyword(s):  
New Method
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