Our results show that near maximal isometric fatiguing contractions superimposed on vibration stimulation lead to a higher rate of fatigue development compared to the isometric contraction alone in the upper limb muscles. (datadryad.org)
The purpose of this study was to examine the potential PAP effect of a hip abduction maximal voluntary isometric contraction (MVIC) on lumbar motion and power output during the barbell back squat. (aiac.org.au)
After three contractions using maximal and submaximal activation (80 and 20 Hz) at an ankle position of 40 (i.e., long muscle length) and with maximal activation at 120 (i.e., short muscle length), the isometric and stretch torques (15 stretches) of rat plantar flexor muscles (bout 1) were measured. (cdc.gov)
Stretches (i.e., ankle rotation from 90 to 40, velocity: 50 s-1) were imposed on maximal isometric contractions at 90 (i.e., preloaded stretches). (cdc.gov)
After maximal contractions at long muscle length, preload torque at 90 and stretch torque at 40 for stretch 1 of bout 1 were 25% and 18% lower than the other groups. (cdc.gov)
BACKGROUND: Neuromuscular fatigue following maximal voluntary isometric contractions (MVIC) dampens both rate of torque development (RTD) and rate of muscle activation (RMA), but the influence of contraction speed (i.e., rapid vs. slow) is less clear. (wku.edu)
The purpose of this study was to determine responses in explosive neuromuscular function and peripheral fatigue after fatiguing, rapid and ramp maximal isometric contractions. (wku.edu)
Because strength is influenced by the amount of time muscles spend under maximal tension, isometric contractions can increase the amount of high-threshold motor units available at that specific point in a joint's range of motion. (stack.com)
Voluntary8
Thirteen healthy volunteers were exposed to both ULV superimposed to fatiguing isometric contractions (V) and isometric contractions alone- Control (C). Both Vibration (V) and Control (C) exercises were performed at 80% of the maximum voluntary contractions. (datadryad.org)
Data calculations of Maximum voluntary contractions' mean and median frequencies. (datadryad.org)
Surface EMG was measured at 3 shoulder elevation angles during IRCs at 4 submaximal levels of maximum voluntary contraction (MVC). (montclair.edu)
The right side remained at rest or performed isometric voluntary contraction with the FDI, biceps or triceps brachii, or the tibialis anterior. (ncl.ac.uk)
The present results indicate that an isometric voluntary contraction with either a distal or a proximal arm muscle, but not a foot dorsiflexor, decreases corticospinal output in a contralateral active finger muscle. (ncl.ac.uk)
Previously published studies on the effect of short-term endurance training on neuromuscular function of the plantar flexors have shown that the H-reflex elicited at rest and during weak voluntary contractions was increased following the training regime. (frontiersin.org)
However, these studies did not test H-reflex modulation during isometric maximum voluntary contraction (iMVC) and did not incorporate a control group in their study design to compare the results of the endurance training group to individuals without the endurance training stimulus. (frontiersin.org)
During neuromuscular testing, rate of torque development, isometric maximum voluntary torque and muscle activation were measured. (frontiersin.org)
Muscles12
All muscles displayed significantly higher reduction in MEFs and corresponding significant increase in EMGrms with the V than the Control, during fatiguing contractions (P (datadryad.org)
Recent data obtained from Rana temporaria sartorius muscles during an isometric tetanus indicate that the time-course of phosphocreatine (PC) splitting cannot account for the total energy (heat + work) liberation (Gilbert et al. (rupress.org)
As this conclusion is important to an understanding of the chemical energetics of contraction, similar experments were performed on unpoisoned, oxygenated Rana pipiens sartorius muscles. (rupress.org)
This is because the longer your muscles are under tension, the more they have to work to maintain the contraction , leading to greater muscle fatigue and ultimately, more muscle growth. (howtogetasixpack.info)
In the present study, we investigated whether contractions of isolated muscles induced phosphorylation of extracellular signal-regulated kinase 1 and 2 (ERK1/2) and p38 MAPK in a fibre-type dependent manner. (elsevierpure.com)
Compared with the contralateral non-stimulated muscle, contractions increased ERK1/2 phosphorylation to the same extent in fast- and slow-twitch muscles. (elsevierpure.com)
Effect of contraction history on torque deficits by stretches of active rat skeletal muscles. (cdc.gov)
Isotonic contractions are how we do all those little things that require lengthening and shortening muscles, like walking and picking up objects. (marksdailyapple.com)
Isometric training goes full-throttle, working muscles at their maximum and for extended periods of time. (marksdailyapple.com)
Thus, we investigated the force output and work produced by single skinned fibers of rat soleus muscles during and after ramp contractions at a constant velocity. (frontiersin.org)
It is possible to consider that the proprioceptive changes in the modulation of muscle contraction in individuals with GJH may influence the pattern of electrical activity on masticatory muscles associated to a clinical state of TMD. (bvsalud.org)
Submaximal3
The EMG and load relationship is commonly measured with multiple submaximal isometric contractions. (montclair.edu)
Phillips, D & Karduna, A 2017, ' Deltoid electromyography is reliable during submaximal isometric ramp contractions ', Journal of Applied Biomechanics , vol. 33, no. 3, pp. 237-240. (montclair.edu)
When a submaximal muscular contraction is followed by stretching of the same muscle, autogenic inhibition occurs, whereas reciprocal inhibition occurs when a submaximal muscular contraction is followed by stretching of the opposite muscle. (who.int)
Concentric contractions3
This combination of eccentric and concentric contractions is the most important type of daily muscle action and plays a significant role in natural locomotion such as walking, running or jumping. (frontiersin.org)
and a focus on concentric contractions for the third block. (stack.com)
Eccentric training can improve the eccentric rate of force development and potentiate subsequent concentric contractions. (stack.com)
Torque8
0.05) compared to the corresponding torque produced in isometric conditions. (jyu.fi)
This, however, could not be considered as neural inhibition, since recorded torque during muscle lengthening was similar or higher compared to the torque recorded during isometric muscle actions. (jyu.fi)
Torque deficits, possibly caused by damage to muscle structures and excitation-contraction uncoupling, were not prevented by a history of isometric contractions. (cdc.gov)
No significant difference of joint torque was found in the steady-state for all SSC-magnitudes compared to the corresponding SHO contractions in session 1. (nature.com)
It has long been identified that this leads to increased force, torque, mechanical work and power during the shortening phase of the SSC compared to a pure shortening contraction, which is not preceded by active stretching ("SSC-effect") 2 , 3 . (nature.com)
In stretch-hold experiments, the force or torque during active stretch but also in the isometric hold phase after active stretch is enhanced compared to a fixed-end reference contraction. (nature.com)
The steady-state force or torque is decreased after shortening-hold (SHO) experiments compared to an isometric hold phase of a fixed-end contraction at the same muscle length and activation level. (nature.com)
CONCLUSIONS: These results suggest that early rapid torque production and RMA is reduced more after slow fatiguing contractions than fast. (wku.edu)
Eccentric6
i ) partial detachment of XBs during the eccentric phase of a SSC, ( ii ) significantly enhanced forces and mechanical work during the concentric phase of SSCs compared with shortening contractions with and without XB-inhibition, and ( iii ) no residual force depression after SSCs. (frontiersin.org)
Although the term "Triphasic" in a training context was popularized by Dietz and Peterson, their's is not the first work to stress the importance of including deliberate eccentric and isometric work in training programs. (stack.com)
I was first introduced to the idea of periodizing eccentric and isometric muscle contractions by Karsten Jensen in his book The Flexible Periodization Method , which was published in 2010. (stack.com)
Some coaches do not believe that including an eccentric and/or isometric emphasis is important in training programs, but both anecdotal and empirical evidence purport that focusing on these contraction types will result in increased concentric output. (stack.com)
It's been demonstrated that a focus on eccentric contractions has a positive influence on bone mineral density as well as the strength of tendons and intramuscular tissue (think fascia and the collagen which holds the bundles of muscle fibers together. (stack.com)
Skeletal muscle2
Energy liberation and chemical change in frog skeletal muscle during single isometric tetanic contractions. (rupress.org)
An active finite element model was developed to predict the mechanical behaviors of skeletal muscle-tendon complex during isometric, shortening and lengthening contraction. (eduhk.hk)
Neuromuscular1
Vibration superimposed on isometric contraction not only seems to alter the neuromuscular function during fatiguing efforts by inducing higher neuromuscular load but also post vibration treatment. (datadryad.org)
Shortening3
The isometric force-length relationship, force-strain relations of the muscle-tendon complex during both shortening and lengthening contraction and muscle relaxation response were predicted using the proposed finite element model. (eduhk.hk)
In addition, the stress distribution in the muscle-tendon complex during isometric, shortening and lengthening contractions was simulated. (eduhk.hk)
In two sessions, 25 healthy participants performed isometric reference (ISO), shortening hold (SHO) and SSC contractions on an isokinetic dynamometer. (nature.com)
Isotonic2
In an isotonic contraction, the contraction strength (the tone of "tonic") stays the same ("iso"), and the length changes. (marksdailyapple.com)
isometric contractions have been shown to generate a maximum amount of intramuscular tension for a longer period of time than is seen during a typical dynamic/isotonic contraction. (stack.com)
Abduction1
Here, we used transcranial magnetic stimulation to examine motor-evoked potentials (MEPs), interhemispheric inhibition at a conditioning-test interval of 10 (IHI10) and 40 ms (IHI40), and short-interval intracortical inhibition (SICI) in the left first dorsal interosseous (FDI) muscle during isometric index finger abduction. (ncl.ac.uk)
Ramp2
The purpose of this study was to determine if the electromyography (EMG) amplitude from the middle deltoid was reliable during isometric ramp contractions (IRCs) at different angles of elevation and rates of force application. (montclair.edu)
Despite a similar total time under tension between protocols, the longer ramp-up during SLOW contractions likely allowed for greater peripheral disturbance. (wku.edu)
Soleus2
The aim of this study was to assess differences in motor control between isometric and lengthening contractions of the soleus muscle. (jyu.fi)
Evoked responses to TMS (MEPs) and electrical stimulation of the peripheral nerve (H-reflexes) where recorded at rest and during isometric and lengthening contractions of the soleus muscle at 20%, 40%, 60% and 80% MVC. (jyu.fi)
MEPs1
Left FDI MEPs were suppressed to a similar extent during contraction of the right FDI and biceps and triceps brachii but remained unchanged during contraction of the right tibialis anterior. (ncl.ac.uk)
Modulation1
Associated to these changes, joint instability in GJH patients can alter the modulation of muscle contraction. (bvsalud.org)
Physiological1
Though the physiological underpinnings cannot be completely elucidated, the impairment in RMA after slow contractions may be due to greater inhibitory feedback resulting from peripheral fatigue. (wku.edu)
Triceps2
IHI10 and IHI40 were decreased during contraction of the right biceps and triceps brachii compared with contraction of the right FDI. (ncl.ac.uk)
Triceps surae muscle activation and tibialis anterior muscle co-activation were assessed by normalized root mean square of the EMG signal during the initial phase of contraction (0-100, 100-200 ms) and iMVC of the plantar flexors. (frontiersin.org)
Stretch2
However, for all groups, bout 1 ended and bout 2 began and ended with similar isometric and stretch torques. (cdc.gov)
Different contraction histories can result in similar isometric torques but different stretch torques. (cdc.gov)
Stimulation1
We investigated the effects of ULV stimulation superimposed on fatiguing isometric contractions using a purpose developed upper limb stimulation device. (datadryad.org)
Tension1
Because intramuscular tension is greater and held for longer than in dynamic exercises, isometric training achieves unique results. (marksdailyapple.com)
Abdominal2
Some experts argue that longer TUT can be beneficial for building abdominal strength, while others believe that shorter, more intense contractions are more effective. (howtogetasixpack.info)
This, combined with simultaneous abdominal and back contraction, maintains the solid core to lift heavy weights. (nyu.edu)
0.051
0.05) during passive lengthening compared to the passive isometric condition (2.5 ± 1.11 mV vs 1.4 ±0.88 mV). (jyu.fi)
Exercises2
Isometric exercises take advantage of these tone contractions to build strength. (marksdailyapple.com)
Aside from potentially helping athletes on the field, isometrics have a more indirect effect on sports performance by helping athletes develop weak points in strength exercises (perhaps targeting the point during an RFE Split Squat where either the foot or the hip collapses, for example). (stack.com)
Significantly1
While both legs had a similar increase in dynamic strength, the isometrically trained leg had a significantly higher increase in isometric strength. (marksdailyapple.com)
Amplitude1
Therefore, it was concluded that the motor cortex generates a descending command of lower amplitude in the case of lengthening contractions. (jyu.fi)
Shorter1
Whether you opt for longer TUT or shorter, more intense contractions, consistency and progressive overload are key to achieving a strong, healthy core. (howtogetasixpack.info)
Similar1
In an active muscle, the H-reflex-to-Mmax ratio was similar between isometric and lengthening modes of contraction. (jyu.fi)
Strength3
For those of you who haven't heard of isometrics, this strength building concept is going to make you think I've officially walked off the deep end. (marksdailyapple.com)
Here the contraction strength changes, while the length ("metric") stays the same. (marksdailyapple.com)
One criticism of isometric training is that the strength gained is only going to be specific to the position where the contraction took place. (stack.com)
In one nine-week study, participants got a little lopsided , working one set of quadriceps with isometrics, and the other with a dynamic workout. (marksdailyapple.com)
Small1
Small units contribute to the finely graded contractions used for delicate manipulations. (medscape.com)
Type1
The Triphasic model emphasizes one specific contraction type per training period or block. (stack.com)