Motor Unit Recruitment
... depends on the force/resistance of the exercise. With light intensity exercise the Type I (slow twitch) motor units are recruited. When the load is increased, the Type IIa (fast twitch) will be recruited with the help of the Type I fibers. When the load becomes even greater, the Type IIx will be recruited with the help of the Type IIa and Type I motor units. Therefore Type I motor units are always firing no matter what the intensity ...http://www.unm.edu/~lkravitz/Exercise%20Phys/motorunitrecruit.html
Disturbances in the voluntary recruitment order of anterior tibial motor units in spastic paraparesis upon fatigue | Journal of...
The recruitment order of motor units in the tibialis anterior muscle upon fatigue of tonic voluntary contraction was studied in 20 patients with severe spastic paraparesis. An electromyographic technique for secure identification of single motor units was used. Before fatigue the recruitment order is stable and low-frequency units are recruited before high-frequency units; this recruitment pattern agrees with that in normal voluntary activity. When fatigue appears, however, the recruitment order becomes indefinite and high-frequency units can be recruited before low-frequency units; this recruitment pattern agrees with that in normal phasic voluntary activity. Finally, all voluntary activation power disappears, even in the case of units which have never been active. Contraction ability and original recruitment order are restored upon rest but also upon tonic reflex support of the voluntary drive. Whether the ...http://jnnp.bmj.com/content/37/1/40
Muscle recruitment pattern in cycling: a review - PDF
Physical Therapy in Sport 6 (2005) Literature review Muscle recruitment pattern in cycling: a review Raymond C.H. So a,b, Joseph K.-F. Ng b, *, Gabriel Y.F. Ng b a Sportshttp://docplayer.net/1126504-Muscle-recruitment-pattern-in-cycling-a-review.html
Age-related decreases in motor unit discharge rate and force control during isometric plantar flexion - Danish National...
Aging is related to multiple changes in muscle physiology and function. Previous findings concerning the effects of aging on motor unit discharge rate (DR) and fluctuations in DR and force are somewhat contradictory. Eight YOUNG and nine OLD physically active males performed isometric ramp (RECR) and isotonic (ISO) plantar flexions at 10 and 20% of surface EMG at MVC. Motor unit (MU) action potentials were recorded with intramuscular fine-wire electrodes and decomposed with custom build software 'Daisy'. DR was lower in OLD in RECR-10% (17.9%, p ...http://www.forskningsdatabasen.dk/catalog/232183208
We employed a surface electromyographic (EMG) signal decomposition technology to study the control properties of numerous simultaneously active motor units. Six healthy human subjects of comparable age (21 ± 0.63 yr) and physical fitness were recruited to perform isometric contractions of the vastus lateralis (VL), first dorsal interosseous (FDI), and tibialis anterior (TA) muscles at the 20%, 50%, 80% and 100% maximum voluntary contraction force levels. EMG signals were collected with a five pin surface array sensor that provided four channels of data. They were decomposed into the constituent action potentials with a new decomposition algorithm. The firings of a total of 1,273 motor unit action potential trains, 20 to 30 per contraction, were obtained. The recruitment thresholds and mean firing rates of the motor units were calculated and mathematical equations were derived. The results describe a hierarchical inverse relationship between the recruitment thresholds and the ...http://jn.physiology.org/content/early/2010/06/16/jn.01018.2009
Intro, homeostasis, muscle & nerve physiology
Motor units are recruited by the SIZE principle (Type I, Type IIa, then Type IIx). The Type 1 are the smallest in DIAMETER and the Type IIx are the biggest in DIAMETER. This recruitment is determined by the FORCE demands placed on the muscle. Can you explain motor unit recruitment in a concise paragraph ...http://www.unm.edu/~lkravitz/Exercise%20Phys/muscle.html
Exercise as it relates to Disease/Utilising exercise in preventing and treating the onset of sarcopenia - Wikibooks, open books...
Sarcopenia comes about due to old age and the consequences that come with it. As a human enters their fourth decade, there is lower motor unit recruitment; the rate of the protein synthesis declines and important hormones such as Human Growth Hormone is also in decline. There are several ways that an adult can slow the process of sarcopenia and eventually reject the negative effects the disease has on them.. Exercise. Experts and professionals have a wide-ranging view on the best approach to specifically achieve hypertrophy, but evidence supporting the notion that physical activity; most significant being resistance training, as being the most efficient way to maintain muscle mass. Resistance training has shown to increase muscle mass and strength, with the gains made in muscle mass and strength via resistance training far outweighing those of any nutritional supplement alone. On the other hand, aerobic exercise commonly does not result in effecting tissue hypertrophy. Instead ...https://en.wikibooks.org/wiki/Exercise_as_it_relates_to_Disease/Utilising_exercise_in_preventing_and_treating_the_onset_of_sarcopenia
Noninvasive analysis of motor unit discharge patterns in isometric force-varying contractions - Danish National Research...
From Research To Practice: Proceedings Xvith Congress of the International Society of Electrophysiology and Kinesiology, Isek 2006, 28 June-1 July 2006, Torino, Italy, 2006 ...http://www.forskningsdatabasen.dk/catalog/2186021915
Revision history of "Muscle Recruitment" - Fellrnr.com, Running tips
09:09, 15 April 2013 User:Fellrnr (User talk:Fellrnr , contribs) deleted page Muscle Recruitment (content was: 'A view of skeletal muscle showing the fibers of a muscle. We control our muscles so that we can lift a heavy we...' (and the only contributor was 'Fellrnr')) ...http://www.fellrnr.com/mediawiki/index.php?title=Muscle_Recruitment&action=history
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Home for Sale by CENTURY 21 Real Estate: 1,380 sq. ft., 2 bed, 2 full bath, 1 half bath house located at 138 Commons Drive, Enterprise, AL 36330 for $74,000.https://www.century21.com/property/138-commons-drive-enterprise-al-36330-C2180266212
Muscular Analysis: Push Up by Ariane Robinson on Prezi
If ~90˚ is the flexion angle for maximal force production of the elbow, what is the optimal extension angle? Why are 'Girl' Push-Ups so much easier? Mechanical advantage is achieved by bringing the fulcrum of the lever closer to the point of resistance. Although the load during a push-up is limited by an individual's body weight and anthropometry (body type), many biomechanical variations of the exercise can be performed. These variations may involve altering hand and foot positions, which impacts muscle recruitment patterns and joint stresses. Girl push-up ...https://prezi.com/k4vjmeu8kpyh/muscular-analysis-push-up/
"Recruitment of Cat Motoneurons in the Absence of Homonymous Afferent F" by Valerie K. Haftel, Jonathan F. Prather et al.
This study provides the first test in vivo of the hypothesis that group Ia muscle-stretch afferents aid in preventing reversals in the orderly recruitment of motoneurons. This hypothesis was tested by studying recruitment of motoneurons deprived of homonymous afferent input. Recruitment order was measured in decerebrate, paralyzed cats from dual intra-axonal records obtained simultaneously from pairs of medial gastrocnemius (MG) motoneurons. Pairs of MG motor axons were recruited in eight separate trials of the reflex discharge evoked by stimulation of the caudal cutaneous sural (CCS) nerve. Some reports suggest that reflex recruitment by this cutaneous input should bias recruitment against order by the size principle in which the axon with the slower conduction velocity (CV) in a pair is recruited to fire before the faster CV axon. Recruitment was studied in three groups of cats: ones with the MG nerve ...https://corescholar.libraries.wright.edu/ncbp/20/
ExRx.net • View topic - LINK BETWEEN COORDINATION AND METABOLISM???
I suppose you could say that a person using more motor units has fewer "large" motor units resulting in many smaller motor units (fewer muscle fibers per motor neuron). In this case, a greater number of motor units would be required in order to recruit the same number of muscle fibers used in another individual. This would mean more active motor neurons, but results in the same number of muscle fibers being used at a given time. That seems inefficient, especially when one considers that the ratio of fibers to motor neuron is dictated by the level of fine control needed in a muscle, but still, it's plausible. However, since the same number of fibers are being use, and only the number of motor neurons have increased, metabolism would remain unaffected ...http://exrx.net/forum/viewtopic.php?p=25749
ExRx.net • View topic - LINK BETWEEN COORDINATION AND METABOLISM???
I suppose you could say that a person using more motor units has fewer "large" motor units resulting in many smaller motor units (fewer muscle fibers per motor neuron). In this case, a greater number of motor units would be required in order to recruit the same number of muscle fibers used in another individual. This would mean more active motor neurons, but results in the same number of muscle fibers being used at a given time. That seems inefficient, especially when one considers that the ratio of fibers to motor neuron is dictated by the level of fine control needed in a muscle, but still, it's plausible. However, since the same number of fibers are being use, and only the number of motor neurons have increased, metabolism would remain unaffected ...http://exrx.net/forum/viewtopic.php?p=25852
Intensive care unit discharge to the ward with a tracheostomy cannula as a risk factor for mortality: A prospective,...
All information about the latest scientific publications of the Clínica Universidad de Navarra. Intensive care unit discharge to the ward with a tracheostomy cannula as a risk factor for mortality: A prospective, multicenter propensity analysishttp://www.cun.es/en/research/scientific-publications/intensive-care-unit-discharge-to-the-ward-with-a-tracheostomy-cannula-as-a-risk-factor-for-mortality-a-prospective-multicenter-propensity-analysis
ExRx.net • View topic - is upper/lower Rectus Abdominis a myth? + abs question.
Some insist they can be isolated. Whether true or not, I think that using various exercises from different angles uses different fiber recruitment patterns and gets you deeper into the muscle fibers for better results. That being said, I'm of the school of thought that abs don't take a lot of training. I like a triset of stability ball crunches, hanging knee raises, and bicycles for 3 circuits x 3 times a week. I also do some low back exercises and occassionally do some side planks or other oblique exercises, although obliques get a lot of work on the big 3 I mentioned above. Also, don't do like a 1,000 crunches. 25 properly performed crunches on a ball should start to give you a cramp and the other two exercises will get you there ...http://exrx.net/forum/viewtopic.php?p=95595
AboutBFS.com • View topic - False positive on emg?
Both EMG and X-Ray (or CT, MRI...) are objective tests where the results provide us with certain physiological data, independently on our opinions. As any data, this data can too be interpreted incorrectly but I as I mentioned, it would take an idiot to confuse voluntary activity for the spontaneous one on the EMG, the same way it would take an idiot to miss a clean fracture on the X-ray. The EMG can be done incorrectly with probably the same probability like the X-ray - so this is not an argument, you could then question any testing requiring human interpretation. I can assure you that the electrophysiological profile of MND is very specific - it is not just about the spontaneous activity, there are other things to consider (like recruitment pattern, F-Wave persistence etc ...http://www.aboutbfs.com/forums/viewtopic.php?f=5&t=21195&p=159435
Macro electromyography : An update
The macro electromyography method was developed in the 1980s. Since then, technical modifications have been made, and a number of conditions have been explored. This study is a methodological introduction and an update of findings in some nerve-muscle disorders. The spike component of a motor unit potential (MUP) recorded by a concentric or monopolar needle electromyography (EMG) electrode is generated primarily by fibers within 1-2 mm of the needle recording area. Given that a MUP's typical anatomical reach is 5-15 mm in diameter, it follows that conventional EMG is unable to record activity from the entire motor unit. Such information could promote understanding of muscle in health and disease. Macro EMG, with its large recording area, appears to provide this information by recording the activity from most of the fibers in a given motor unit. The value of combining macro EMG with single-fiber EMG and conventional EMG recordings is discussed.. ...http://uu.diva-portal.org/smash/record.jsf?pid=diva2:438322
"Firing Rate Modulation of Motoneurons Activated by Cutaneous and Muscl" by Jonathan F. Prather, B. D. Clark et al.
The aim of this study was to investigate whether activation of spinal motoneurons by sensory afferents of the caudal cutaneous sural (CCS) nerve evokes an atypical motor control scheme. In this scheme, motor units that contract fast and forcefully are driven by CCS afferents to fire faster than motor units that contract more slowly and weakly. This is the opposite of the scheme described by the size principle. Earlier studies from this lab do not support the atypical scheme and instead demonstrate that both CCS and muscle stretch recruit motor units according to the size principle. The latter finding may indicate that CCS and muscle-stretch inputs have similar functional organizations or that comparison of recruitment sequence was simply unable to resolve a difference. In the present experiments, we examine this issue using rate modulation as a more sensitive index of motoneuron activation than recruitment. Quantification of the firing output generated by ...http://corescholar.libraries.wright.edu/ncbp/7/
Using Prilephin's Table
Prilephin's table can be used as a tool to plan you next workout. This table takes advantage of both the maximal and dynamic effort methods of strength training. The reason we exercise using several methods is to vary the level of resistance so to cause differences in metabolic reactions, intramuscular coordination, and biomechanical variables. By training this way we enable ourselves to work intensely enough to bring about the optimal gains in strength. When maximal weights are lifted the largest number of motor units are activated . Using the maximal effort method is thought to be best for training the muscles and CNS due to the great load place on them. Because of the high level of motivation needed to lift maximal weights, the lifter can easily become over trained. Therefore, only about 10% of our training cycle will be spent lifting maximal and supramaximal weights. As we all are very aware, a good maximal lift is often determined by the amount of explosion we generate out of the hole. If ...http://www.angelfire.com/pe/txpls/prilephin.html
EMG - Force Relationship Signal Processing.3 - ppt video online download
EMG - Force Relationship An EMG signal will not necessarily reflect the total amount of force (or torque) a muscle can generate The number of motor units recorded by electrodes will be less than the total number of motor units that are firing - electrodes can't pick-up all motor unitshttp://slideplayer.com/slide/1388769/
Forza Motorsport 3
For all you fans of Forza Motorsport, latest screenshots for Forza 3: :D http://forzamotorsport.net/en-us/media/images/default.htm#/screenshot/947/ Details of some different motors for the new game, along with free unicorn car giveaway here: http://forzamotorsport.net/en-us/VIP_style.aspxhttps://www.vectra-c.com/forum/showthread.php?87520-Forza-Motorsport-3
Job analysis, selection and recruitment
Within any organisation, your most valuable assets are your employees. The cost of recruiting, training and developing your staff is the greatest expense for many organisations. Selection and recruitment includes targeting populations with your desired knowledge, skills and abilities - if you're not attracting the right applicants to your advertised positions, the WORC team can provide tailored solutions to your selection and recruitment needs. ...https://www.griffith.edu.au/health/clinics/work-organisational-resilience-centre/job-analysis,-selection-and-recruitment
Recruitment Rap | Ares
The Dutch Ministry of Defense has enlisted rapper Kraantje Pappie for a recruitment campaign. Kraantje Pappie has repackaged the Dutch infantry song in rap form, the video of which can be found on the Ministry of Defense's recruitment website.http://aviationweek.com/blog/recruitment-rap
Everything You Always Wanted to Know About Sleep But Were Too Tired to Ask
An illuminating description of the sleep cycle and common sleep disorders, and information on safe and natural ways known to encourage refreshing sleehttp://www.prohealth.com/me-cfs/library/showarticle.cfm?libid=15688