Non-invasive method to detect motor unit contractile properties and conduction velocity in human vastus lateralis muscle

1995 ◽  
Vol 33 (4) ◽  
pp. 558-562 ◽  
Author(s):  
H. Nishizono ◽  
T. Fujimoto ◽  
H. Kurata ◽  
H. Shibayama
Keyword(s):  
Motor Unit ◽  
Conduction Velocity ◽  
Vastus Lateralis ◽  
Contractile Properties ◽  
Vastus Lateralis Muscle ◽  
Non Invasive ◽  
Lateralis Muscle ◽  
Invasive Method

Vastus lateralis muscle tissue composition and motor unit properties in chronically endurance-trained vs. sedentary women

2018 ◽  
Vol 118 (9) ◽  
pp. 1789-1800 ◽  
Author(s):  
Hannah L. Dimmick ◽  
Jonathan D. Miller ◽  
Adam J. Sterczala ◽  
Michael A. Trevino ◽  
Trent J. Herda
Keyword(s):  
Motor Unit ◽  
Muscle Tissue ◽  
Vastus Lateralis ◽  
Vastus Lateralis Muscle ◽  
Tissue Composition ◽  
Lateralis Muscle ◽  
Sedentary Women

scholarly journals Recruitment Order of Motor Units in Human Vastus Lateralis Muscle Is Maintained During Fatiguing Contractions

2003 ◽  
Vol 90 (5) ◽  
pp. 2919-2927 ◽  
Author(s):  
Alexander Adam ◽  
Carlo J. De Luca
Keyword(s):  
Motor Unit ◽  
Time Course ◽  
Vastus Lateralis ◽  
Motor Units ◽  
Voluntary Contraction ◽  
Vastus Lateralis Muscle ◽  
Force Output ◽  
Similar Time ◽  
Lateralis Muscle ◽  
Recruitment Order

Motor-unit firing patterns were studied in the vastus lateralis muscle of five healthy young men [21.4 ± 0.9 (SD) yr] during a series of isometric knee extensions performed to exhaustion. Each contraction was held at a constant torque level, set to 20% of the maximal voluntary contraction at the beginning of the experiment. Electromyographic signals, recorded via a quadrifilar fine wire electrode, were processed with the precision decomposition technique to identify the firing times of individual motor units. In repeat experiments, whole-muscle mechanical properties were measured during the fatigue protocol using electrical stimulation. The main findings were a monotonic decrease in the recruitment threshold of all motor units and the progressive recruitment of new units, all without a change of the recruitment order. Motor units from the same subject showed a similar time course of threshold decline, but this decline varied among subjects (mean threshold decrease ranged from 23 to 73%). The mean threshold decline was linearly correlated ( R2 ≥ 0.96) with a decline in the elicited peak tetanic torque. In summary, the maintenance of recruitment order during fatigue strongly supports the notion that the observed common recruitment adaptations were a direct consequence of an increased excitatory drive to the motor unit pool. It is suggested that the increased central drive was necessary to compensate for the loss in force output from motor units whose muscle fibers were actively contracting. We therefore conclude that the control scheme of motor-unit recruitment remains invariant during fatigue at least in relatively large muscles performing submaximal isometric contractions.

scholarly journals Age-related changes in motor unit firing pattern of vastus lateralis muscle during low-moderate contraction

AGE ◽  
2016 ◽  
Vol 38 (3) ◽  
Author(s):  
Kohei Watanabe ◽  
Aleš Holobar ◽  
Motoki Kouzaki ◽  
Madoka Ogawa ◽  
Hiroshi Akima ◽  
...  
Keyword(s):  
Motor Unit ◽  
Firing Pattern ◽  
Vastus Lateralis ◽  
Vastus Lateralis Muscle ◽  
Age Related ◽  
Motor Unit Firing ◽  
Lateralis Muscle ◽  
Age Related Changes

Motor unit firing pattern of vastus lateralis muscle in type 2 diabetes mellitus patients

2013 ◽  
Vol 48 (5) ◽  
pp. 806-813 ◽  
Author(s):  
Kohei Watanabe ◽  
Marco Gazzoni ◽  
Ales Holobar ◽  
Toshiaki Miyamoto ◽  
Kazuhito Fukuda ◽  
...  
Keyword(s):  
Diabetes Mellitus ◽  
Type 2 Diabetes ◽  
Type 2 Diabetes Mellitus ◽  
Motor Unit ◽  
Firing Pattern ◽  
Vastus Lateralis ◽  
Vastus Lateralis Muscle ◽  
Motor Unit Firing ◽  
Lateralis Muscle

Firing rates of motor units in human vastus lateralis muscle during fatiguing isometric contractions

2005 ◽  
Vol 99 (1) ◽  
pp. 268-280 ◽  
Author(s):  
Alexander Adam ◽  
Carlo J. De Luca
Keyword(s):  
Firing Rate ◽  
Motor Unit ◽  
Vastus Lateralis ◽  
Motor Units ◽  
Test Sequence ◽  
System Control ◽  
Vastus Lateralis Muscle ◽  
Force Output ◽  
Constant Torque ◽  
Lateralis Muscle

We investigated the firing rate of motor units in the vastus lateralis muscle in five healthy young men (mean = 21.4 yr, SD = 0.9) during a sequence of isometric constant-torque contractions repeated to exhaustion. The contractions were sustained at 20% of the maximal voluntary level, measured at the beginning of the test sequence. Electromyographic (EMG) signals were recorded via quadrifilar fine-wire electrodes and subsequently decomposed into their constituent motor unit action potentials to obtain the motor unit firing times. In addition, we measured the whole muscle mechanical properties during the fatigue task using electrical stimulation. The firing rate of motor units first decreased within the first 10–20% of the endurance time of the contractions and then increased. The firing rate increase was accompanied by recruitment of additional motor units as the force output remained constant. The elicited twitch and tetanic torque responses first increased and then decreased. The two processes modulated in a complementary fashion at the same time. Our data suggest that, when the vastus lateralis muscle is activated to maintain a constant torque output, its motoneuron pool receives a net excitatory drive that first decreases to compensate for the short-lived potentiation of the muscle force twitch and then increases to compensate for the diminution of the force twitch. The underlying inverse relationship between the firing rate and the recruitment threshold that has been reported for nonfatigued contractions is maintained. We, therefore, conclude that the central nervous system control of vastus lateralis motor units remains invariant during fatigue in submaximal isometric isotonic contractions.

Ayurvedic management of Myositis Ossificans of Vastus Lateralis Muscle (Urusthamba) - A Case Study

2017 ◽  
Vol 2 (1) ◽  
Author(s):  
Vishnu Mohan ◽  
Gopikrishna BJ ◽  
Avnish Pathak ◽  
Mahesh Kumar ES ◽  
Duradundi G
Keyword(s):  
Heterotopic Ossification ◽  
Myositis Ossificans ◽  
Vastus Lateralis ◽  
Treatment Protocol ◽  
Vastus Lateralis Muscle ◽  
Satisfactory Treatment ◽  
Lateralis Muscle ◽  
Ayurvedic Treatment

Myositis ossificansis characterized by heterotopic ossification (calcification) of muscle of various etiologies. It is most commonly affected in the quadriceps of the thighs. There are many tools available for diagnosis of Myositis ossificans, but lack of satisfactory treatment. So the development of a treatment protocol for Myositis ossificans is the need of today`s era. In Ayurveda, the same can be understood as Urusthamba. The present paper discusses a case of Myositis ossificans of right vastus lateralis muscle and its Ayurvedic treatment.

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