Maximal eccentric and concentric quadriceps contraction. Medical search. Frequent questions

Preseason assessment of hamstring flexibility, concentric and eccentric isokinetic peak torque and peak torque angle were obtained at the beginning of an athletic season. (bmj.com)
One might consider performing isokinetic open chain quadriceps and hamstring tests on the KIN-COM. (orthoteers.com)
In two sessions, 25 healthy participants performed isometric reference (ISO), shortening hold (SHO) and SSC contractions on an isokinetic dynamometer. (nature.com)
Limited information concerning the influence of hip angle, muscle contraction mode, and velocity on the isokinetic knee strength over the entire range of motion (ROM) is available. (springeropen.com)
1.78 ± 0.07 m) were tested for isokinetic knee flexion and extension at 10° and 90° hip flexion with the following conditions: (i) concentric at 60°/s, (ii) concentric at 180°/s, and (iii) eccentric at 60°/s. (springeropen.com)
The angle-specific analysis of isokinetic torques during knee extension and flexion reveals effects according to the hip flexion, velocity, and contraction mode that were not captured by peak torque and angles at peak torques. (springeropen.com)
12 Ewing J LJR, Wolfe D R, Rogers M A, Amundson M L, Stull G A. Effects of velocity of isokinetic training on strength, power, and quadriceps muscle fibre characteristics. (thieme-connect.com)
Maximal voluntary concentric force and fatigue resistance of the knee flexors and extensors was measured using isokinetic dynamometry. (infinitelabs.com)
This study examined the effects of Kinesio taping on recovery from fatigue induced by an exercise of concentric contraction using an isokinetic machine. (e-jer.org)
Aagaard P, Simonsen EB, Magnusson SP, Larsson B, Dyhre-Poulsen P. A new concept for isokinetic hamstring: quadriceps muscle strength ratio. (sportrxiv.org)
Aagaard P, Simonsen EB, Trolle M, Bangsbo J, Klausen K. Isokinetic hamstring/quadriceps strength ratio: influence from joint angular velocity, gravity correction and contraction mode. (sportrxiv.org)

Eccentric training is a type of strength training that involves using the target muscles to control weight as it moves in a downward motion. (wikipedia.org)
Eccentric training focuses on slowing down the process of muscle elongation to challenge the muscles, which can lead to stronger muscles, faster muscle repair and increasing metabolic rate. (wikipedia.org)
Eccentric training is particularly good for casual and high-performance athletes or the elderly and patients looking to rehabilitate certain muscles and tendons. (wikipedia.org)
0.05) activity in the anterior trunk muscles (RA and EO) during the eccentric phase. (researchgate.net)
0.05) activity in the posterior aspect of the trunk (ES) and all lower-body muscles during the concentric phase. (researchgate.net)
Loading response plantar flexion is passive, substantially restrained by eccentric work of pretibial muscles. (medscape.com)
Within these topics, the interaction between quadriceps and hamstring muscles and the contribution of mono- and bi-articular muscles remain complex and are not fully understood [ 8 ]. (springeropen.com)
Isometric exercises (commonly just referred to as isometrics) are exercises during which neither the angle of your joints nor the length of your muscles change during contraction. (tigerfitness.com)
For example, the quadriceps muscles preset tension to stabilise the knee in full extension at initial contact during the gait cycle. (bootcampmilitaryfitnessinstitute.com)
In a decline squat, these muscles are inhibited, forcing the quadriceps (via the pateller tendon) to do the lion's share of the work. (runningwritings.com)
BACKGROUND:In the early phase after a total knee arthroplasty (TKA), patients experience multi-level weakness in the operated leg, which is caused primarily by reduced central nervous system (CNS) activation failure of the muscles - especially the knee extensors (quadriceps muscle). (omicsdi.org)
Voluntary peak muscle activity (%EMGmax) was calculated for the quadriceps and hamstring muscles for each exercise. (omicsdi.org)
Glycogen supercompensation occurs only in muscles that were trained and is maximal at a carbohydrate intake of approximately 25 grams per hour for average adults and possibly 40 grams or more per hour for bodybuilders. (tripod.com)
In such a training, muscles undergo a rapid elongation followed by an immediate shortening (stretch-shortening contraction), utilizing the elastic energy stored during the stretching phase. (spandidos-publications.com)
So how does football and its training influence the knee joint and possible injuries with regards to the quadriceps and hamstring muscles? (footballscience.net)
The functional hamstring to quadriceps ratio (also called H/Q ratio) is a calculation in which the strength (peak torque) of the hamstring muscles in eccentric motion is divided by the strength of the quadriceps in a concentric motion (2). (footballscience.net)
3 Furthermore, the addition of BFR has been shown to increase the neuromuscular activation and MVC (maximum voluntary contraction) of targeted muscles 15 minutes after BFR was applied. (mtrigger.com)

Eccentric training is repetitively doing eccentric muscle contractions. (wikipedia.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)
Starting at 30% of your maximum voluntary contraction in an isometric hold, scientists already observe a partial occlusion as a result of the muscle fibers pressing against the small capillaries responsible for the oxygen delivery. (train.red)
7 Especially under isometric conditions, the maximum voluntary contraction EMG amplitude is greatly reduced: 72.5% at low pressure vs. 46.3% of maximum EMG activity at higher pressures. (mtrigger.com)

What is and how is the functional hamstring to quadriceps ratio measured? (footballscience.net)
Hamstring and ACL injuries impacts on hamstring-to-quadriceps ratio of the elite soccer players: A retrospective study. (sportrxiv.org)

Peak torque was measured in the quadriceps and hamstrings and surface EMG activity were collected from the vastus lateralis, vastus medialis, semitendinosus, and biceps femoris during knee extension at 30°/s, 90°/s, and 150°/s using concentric (shortening) and eccentric (lengthening) contractions of the hamstrings. (ecu.edu)
Outputs of the EMG-driven model were: 1) net concentric knee extension torque (summation of the torque computed from EMG activity of the quadriceps and hamstrings), 2) agonist torque (torque calculated from the EMG activity of the quadriceps), and 3) antagonist torque (torque calculated from the EMG activity of the hamstrings). (ecu.edu)
Continuing from above, another study found a 29% vs. 19% increase in eccentric enhanced vs. traditional training in the hamstrings muscle group (13). (strength-forge.com)
Serious knee injuries are an all too common occurrence in a range of sports, and commonly result from a lack of strength in the supporting musculature, imbalances in the quadriceps and hamstrings, or strength asymmetries between left and right. (autmillennium.org.nz)
In conclusion, players who sustained in-season HSI had lower pre-season FR and CR compared to UP, which appears to be associated with higher levels of quadriceps concentric torque than hamstrings concentric or eccentric torque. (sportrxiv.org)

Cox regression analysis revealed that athletes with a decrease in the hamstring : quadriceps peak torque ratio of less than 0.60 at an angular velocity of 180°/s have a 17-fold increased risk of hamstring injury. (bmj.com)
Performing preseason hamstring : quadriceps peak torque ratio assessments may be useful to identify sprinters susceptible to hamstring injury. (bmj.com)
5 It was further suggested that concentric hamstring : quadriceps peak torque ratio (Hcon : Qcon) could be used to discriminate the at-risk group. (bmj.com)
As humans age, the ability to produce maximal voluntary torque decreases due to muscle atrophy (sarcopenia) and it is also known that advancing age alters the neural control of voluntary movement. (ecu.edu)
The calculated torques revealed that young vs. old adults produced more calculated net concentric torque and that old vs. young adults had significantly greater calculated antagonist hamstring torque production. (ecu.edu)
The difference in calculated net concentric torque was attributed to increased calculated antagonist hamstring torque in old adults, since calculated agonist quadriceps torque was similar between the two groups. (ecu.edu)
In conclusion, while the age-related loss of maximal voluntary torque has been primarily attributed to sarcopenia, the present data suggest that such reductions may also include decreases in torque due to hyperactivity of antagonist muscle that increase the counteracting torques produced by the agonist prime movers. (ecu.edu)
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)
The effects of hip angle, contraction mode, and velocity on angle-specific torques and HQ-ratios as well as conventional parameters (peak torques, angles at peak torque, and HQ-ratios) were analyzed using statistical parametric mapping and parametric ANOVAs, respectively. (springeropen.com)
The torque values were greater at the lower velocity and eccentric mode, but the influence of the velocity and contraction mode were lower at shorter and greater muscle lengths, respectively. (springeropen.com)
Thereby, one study found a more pronounced increase of the eccentric compared to the concentric peak torque [ 10 ]. (springeropen.com)
In later propulsion, AS slows trunk extension down enhancing hip torque thus prolonging the concentric extensor action leading to increased force and torque generation. (meyerphysio.com)
A common pre-season injury prevention assessment conducted by professional football clubs is the hamstring-to-quadriceps (H:Q) strength ratio calculated by peak torque (PT). (sportrxiv.org)
Hamstring-to-Quadriceps Torque Ratios of Professional Male Soccer Players: A Systematic Review. (sportrxiv.org)

each low peak refers to a repetition, where the load phase (in purple) represents the eccentric downward phase of the squat and the hard intensity phase (in red) represents the concentric upward phase of the squat. (train.red)
The hypothesis was that strength training exercises performed in machines would elicit higher levels of voluntary peak quadriceps and hamstring muscle activity than strength training exercises performed in more simple forms, using elastic bands or the patients' own body weight. (omicsdi.org)
At the end of the study, a significant and equal improvement in peak concentric force was found in the told caffeine, given caffeine subjects and told placebo, given caffeine trials. (infinitelabs.com)

Bilateral concentric strength of the ankle plantarflexors and dorsiflexors, knee flexors and extensors, and hip extensors was measured. (iospress.com)
However, the beneficial effects of long-term VRT on maximal strength both in athletes and untrained individuals have been much disputed. (researchgate.net)
Long-term VRT training using chains or elastic bands attached to the barbell emerged as an effective evidence-based method of improving maximal strength both in athletes with different sports backgrounds and untrained subjects. (researchgate.net)
The angle-specific effects provide the importance of the hip flexion angle, velocity, and contraction mode for the individualization of knee strength training and testing within performance, prevention, and rehabilitation programs. (springeropen.com)
In contrast to isometric contractions to maintain strength during periods of immobilisation or times when joint motion is contraindicated, isometric contractions for muscle re-education can be submaximal. (bootcampmilitaryfitnessinstitute.com)
Strength isn't measured only by how much you can lift (the concentric motion), but also controlling the eccentric. (bodybuilding.com)
It's important to note that strength isn't measured only by how much you can lift (the concentric motion), but also controlling the eccentric. (bodybuilding.com)
Adequate isometric stabilization strength (to developed through balance, core, and resistance-stabilization exercises) decreases through the time between the eccentric muscle action and concentric contraction, that will result in a shorter ground contact time, which result in decreased tissue overload and potential when performing plyometric training. (beautiflworid.com)
Quadriceps muscle activity during commonly used strength training exercises shortly after total knee arthroplasty: implications for home-based exercise-selection. (omicsdi.org)
Therefore, this study explored whether the addition of motor imagery to routine physical therapy reduces the deterioration of quadriceps muscle strength and voluntary activation (VA) as well as other variables related to motor performance in patients after total knee arthroplasty (TKA). (omicsdi.org)
In addition, multiple linear regression analysis showed that failure of voluntary activation explained 47% of the quadriceps muscle strength loss, with no significant difference in perceived level of pain. (omicsdi.org)
Several studies revealed an effect of caffeine on maximal strength. (infinitelabs.com)
For instance, studies that have tested percent muscle activation and maximal muscle strength of the knee extensors under isometric conditions have shown that caffeine is capable of increasing voluntary activation and strength. (infinitelabs.com)
A 2014 study reported that the substance can increase not only concentric (i.e. lifting the weight) and eccentric (i.e. lowering the weight) maximal strength, indicating that caffeine increased maximal strength regardless of the contraction mode. (infinitelabs.com)
Researchers examined the placebo effect and the combined effect of caffeine and caffeine expectancy on maximal voluntary strength. (infinitelabs.com)
Although this is a product of kinaesthetic awareness, stability is significantly influenced by your eccentric strength. (strength-forge.com)
10) found that even when adding weight to the eccentric contraction (around 50% additional weight), subjects gained 2.0x more strength when compared to a traditional training group (who lifted and lowered the same amount of weight). (strength-forge.com)
Eccentric overload training has been shown to result in significant strength gains and even greater gains in jump height when compared to traditional training (7). (strength-forge.com)
In other words, the increased intensity that your body is able to access during Eccentric Training, can create an epigenetic response, that alters your body's physiological makeup, resulting in increased power and speed, alongside strength. (strength-forge.com)
For maximal strength training, as well as athletic conditioning, we advocate and advise that both bilateral (two leg [squat & deadlift variations]) and unilateral (single leg) movements are used in conjunction. (swolverine.com)
It is also effective for athletes who lack the concentric/eccentric strength to get into a deeper than parallel position. (swolverine.com)

Maximal isometric force (MVC), maximal concentric force, squat jump (SJ) and counter movement jump (CMJ) exercises were performed before and after the training program. (thieme-connect.com)
The results, confirmed by a more thorough clinical trial a year later, showed that just a small change in protocol-doing an eccentric squat on a decline instead of on flat ground-had a significant effect on the patients' outcome. (runningwritings.com)
highlighted was that, in a regular eccentric squat, various other muscle groups could help stabilize the knee and take some load off the patellar tendon. (runningwritings.com)

Multi-angle isometric quadriceps should be used for the first 2 weeks, rather than CKC exercises, as they do not stress the meniscal repair18. (orthoteers.com)
With compound and isolation exercises (exercises where you are moving weights through space), the joint angles and muscle lengths are changing as you execute the concentric and eccentric portions of your repetitions. (tigerfitness.com)
One of the benefits of isometric exercise is the ability to perform repetitive submaximal contractions as "reminder" or re-education exercises. (bootcampmilitaryfitnessinstitute.com)
Quadriceps setting and rotator cuff isometric exercises at a low, submaximal level can maintain connective tissue mobility (and at the knee, patellar mobility), and muscle mobility and function. (bootcampmilitaryfitnessinstitute.com)
These isometric setting exercises are also a prerequisite for more advanced dynamic exercises, particularly those requiring eccentric muscle contractions. (bootcampmilitaryfitnessinstitute.com)
These finding suggest that eccentric exercises to repair tendons should be highly targeted to put a large, controlled stress on the tendon which cannot be mitigated by other muscle groups. (runningwritings.com)
Plyometric (reactive) training involves exercises that will generate quick, with powerful movements involving explosive concentric muscle contraction preceded by an eccentric muscle action. (beautiflworid.com)
The term "plyometrics" refers to specific exercises which encompass a rapid stretching of muscle that is undergoing eccentric stress followed by a concentric, rapid contraction of that muscle for the purpose of developing a forceful movement over a short period of time (Chu, 1983). (thesportjournal.org)

Quadriceps and gluteal sets are also used to enhance circulation throughout the lower extremity during periods of bed rest. (bootcampmilitaryfitnessinstitute.com)

The aim of this study was to compare the effects of plyometric training performed with rapid or slow stretch contraction on jump performance and muscle properties. (thieme-connect.com)
The results of this study show that when plyometric training is performed with rapid stretch contraction the CMJ jump height increases and the TR decreases. (thieme-connect.com)
There are three distinct phases involved in plyometric training, that includes the eccentric or loading phase, the amortization phase or the transition phase, and the concentric or the unloading phase. (beautiflworid.com)
This first stage of plyometric movement can be classified as the eccentric phase, or the deceleration, loading, yielding, counter movement or cocking phase. (beautiflworid.com)

Long-term muscle exercise causes waste products by chemical changes in the muscle, and when glycolysis and adenosine triphosphate are depleted, the contraction of muscle fibers decreases, leading to fatigue. (e-jer.org)

As we covered last week, a 2004 pilot study showed that eccentric decline squats are a highly effective rehab exercise for patients with patellar tendonitis . (runningwritings.com)

Conventional resistance exercise is composed of both lengthening and shortening muscle contractions (touch your shoulder and imagine lowering down a dumbbell (lengthening) and then lifting it again (shortening). (ukri.org)
Isometric muscle assessment is classically used, involving a maximal voluntary contraction performed at specified joint position against unyielding resistance. (iospress.com)
Dr. Per Tesch, recently in 2017, analyzed in the article Clinical Applications of Iso-Inertial, Eccentric-Overload (YoYo ™) Resistance Exercise the whole history of the method highlighting its effects. (spacewheel.it)
Improvements were achieved in the maximum dynamic resistance of the quadriceps, in the MVC at different loads, in the vertical jump and in the acceleration test over 20 meters. (spacewheel.it)

Adolf Eugen Fick discovered in 1882 that "contracting muscle under stretch could produce greater force than a shortening muscle contraction" like in concentric movements. (wikipedia.org)
The pre-stretching downwards muscle lengthening counteraction is the eccentric phase of the stretch-shortening (SSC), allowing hip and knee flexion with ankle dorsi-flexion ( Komi, 1992 ). (meyerphysio.com)

Old adults had greater coactivation during knee extension at all three contraction velocities. (ecu.edu)

MViC and VA of quadriceps muscle, knee flexion and extension range of motion, pain level, along with a Timed Up-and-Go Test (TUG) and self-reported measure of physical function (assessed using the Oxford Knee Score questionnaire [OKS]) were evaluated before (PRE) and 1 month after surgery (POST). (omicsdi.org)

For example, in a biceps curl the action of lowering the dumbbell back down from the lift is the eccentric phase of that exercise - as long as the dumbbell is lowered slowly rather than letting it drop (i.e., the biceps are in a state of contraction to control the rate of descent of the dumbbell). (wikipedia.org)

This study was aimed to consider the effects of uphill (concentric, CON) and downhill (eccentric, ECC) treadmill exercise with Nano-BCAA supplementation on muscle protein expression of Akt and mTOR. (springermedicine.com)
When the load exceeds the force that can be developed by the muscle at a constant length, as in an eccentric muscle action, the exercise is referred to as involving negative work, because the muscle is absorbing energy. (wikipedia.org)
2006 stated that the external oblique and rectus abdominis were significantly less active during the Ab-Slide exercise performed as an eccentric than during the crunch exercise performed as a concentric and the crunch exercise could prefer for abdominal exercise. (researchgate.net)
When the exercise begins, there is muscle contraction and consequently occlusion from muscle capillaries. (train.red)
this response is not seen when performing the eccentric and concentric portions of the repetitions of other types of exercise. (tigerfitness.com)
Each exercise consisted of six sets of ten repetitions with a barbell on the shoulders at 70 % of the maximal isometric force (1 RM). (thieme-connect.com)
The method, in the sports field, has seen its great use thanks to the Spanish studies of Tous which highlighted how this tool was useful for creating an eccentric overload during exercise. (spacewheel.it)
Concentric Muscle Action - The lifting portion of an exercise. (theathletesphysique.com)
Bowers EJ, Morgan DL and Proske U: Damage to the human quadriceps muscle from eccentric exercise and the training effect. (spandidos-publications.com)
The fatigue was induced by concentric exercise at 60°/sec, 50 repetitions for one session, and repeated 3 sessions. (e-jer.org)

Eccentric contractions use less metabolic energy, even though they can create more force than concentric actions. (wikipedia.org)
Measured time courses of force decay during isometric contractions of rabbit M. gastrocnemius and M. plantaris were employed for model verification, with the finding that our suggested model enhancement proved eminently promising. (frontiersin.org)
This phase involves dynamic stabilization and is the time between the end of the eccentric muscle action (the loading or deceleration phase) and also the initiation of the concentric contraction (the unloading or the force production phase). (beautiflworid.com)
The amortization phase, which is sometimes referred to as the transition phase, is also referred to as the electromechanical delay between the eccentric and concentric contraction during which the muscle must switch from overcoming the force to imparting force in the intended direction. (beautiflworid.com)
The greatest work you have is during the eccentric phase of the movement, in which you have to oppose the force with your own muscle activation. (spacewheel.it)
Research has explained to us that in order to use this technology correctly, the athlete must apply maximum force during the concentric phase of the action. (spacewheel.it)
The inertial device, therefore, will produce a counter force that must be countered and controlled by the athlete in the eccentric phase of the movement without an interruption. (spacewheel.it)
According to Tesh, 2004, the eccentric benefit will be obtained only if the athlete accompanies the car in the first two thirds of the joint stroke, and then applies maximum braking force in the last third of this phase. (spacewheel.it)
The study demonstrated a better relationship in the development of force between the concentric and eccentric phases of action in the inertial device with notable adaptations in the eccentric phase. (spacewheel.it)
Experimental knee pain impairs submaximal force steadiness in isometric, eccentric, and concentric muscle actions. (docksci.com)
Starting the second part of the SSC, concentric leg muscle action causes upward force while the COM is still moving downwards. (meyerphysio.com)
Maximum lower limb muscle contraction produces force causing almost maximum GRF. (meyerphysio.com)
The contractile (sarcomere) component creates maximal force when all cross-bridges are attached. (meyerphysio.com)
6 When exercising with BFR, there is a greater decline in the maximal voluntary isometric muscle contraction (seen as a decrease in force production) compared to lower pressures or no BFR intervention at all. (mtrigger.com)

During the eccentric phase of the movement, the muscle absorbs energy. (wikipedia.org)
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)
Subjects were filmed (100 Hz) and each jump was divided into three phases: eccentric phase (ECC), transition phase (TR) and concentric phase (CON). (thieme-connect.com)
In other words my friends, there is a cocking or a loading phase described as an eccentric muscle action that dampens or that slows the downward movement of our body (deceleration) followed immediately by an explosive concentric muscle contraction. (beautiflworid.com)
With a rapid switch from an eccentric loading phase to a concentric contraction that leads to a more powerful response. (beautiflworid.com)
The concentric phase, (which is the unloading phase) will occur immediately after the amortization phase and will involve a concentric contraction, resulting in enhanced muscular performance after the eccentric phase of muscle contraction. (beautiflworid.com)
This string is adjusted according to the length of the movement to be performed in order to store speed during the concentric phase of the movement. (spacewheel.it)
In the concentric phase the string is completely pulled, and then rewinds around the central shaft during the eccentric phase. (spacewheel.it)
The depth jump is thought to enhance vertical jump performance through the quickening of the amortization phase, which is the electromechanical delay from the initiation of eccentric to the initiation of concentric muscle actions of the movement (Steben & Steben, 1981). (thesportjournal.org)

Coombs R, Garbutt G. Developments in the use of the hamstring/quadriceps ratio for the assessment of muscle balance. (sportrxiv.org)

Eccentric muscle contractions require that a concentric or an isometric contraction take place first, pre-setting tension in the muscle. (bootcampmilitaryfitnessinstitute.com)
Eccentric Contraction - Muscle lengthening while maintaining tension or under load. (theathletesphysique.com)

When you lift a weight against gravity, a muscle contraction (shortening) takes places around a joint or joints. (bodybuilding.com)
Subjects and methods: Reproducibility mean and maximal work without correction of gravity was first assessed in 14 neuromuscular patients, at 10°/s. (iospress.com)

Eccentric movement provides a braking mechanism for muscle and tendon groups that are experiencing concentric movement to protect joints from damage as the contraction is released. (wikipedia.org)

A balance between knee stability and shock absorption is achieved by eccentric quadriceps contractions during loading response. (medscape.com)
This allows a subsequent quadriceps eccentric contraction to decelerate the flexing knee to absorb shock. (bootcampmilitaryfitnessinstitute.com)

However, this study accounted for that, decreasing the total reps down by the eccentric overload group to make sure the total weight lifted (sets x reps x load) was the same. (strength-forge.com)

Cardiac muscle is controlled by the heart's sinoatrial node and produces rhythmic contractions that cause your heart to pump. (oxygenmag.com)

One thing I didn't make clear enough is that Alfredson's eccentric heel drop protocol, developed in 1998, was designed for midpoint Achilles tendonitis. (runningwritings.com)
This problematic result probably stumped researchers for some time-the original study linking eccentric heel drops to good recovery prospects in midpoint Achilles tendonitis was published in 1998, but productive results for insertional Achilles tendonitis did not make it into the literature until 2008. (runningwritings.com)

Weight bearing in full extension assists quadriceps activation and helps to prevent loss of knee extension range(18), and may also promote meniscal healing through early physiological loading(67). (orthoteers.com)
This applies when the reference contraction is length-matched and has the same activation level. (nature.com)
For one study, real time visual biofeedback on quad muscle activation was provided to assist participants in maintaining a sustained quadriceps contraction. (mtrigger.com)

Herein we propose to trial the efficacy of lengthening and shortening contractions in counteracting spatial differences we have identified in sarcopenia while also studying the mechanisms underlying why these contractions work the way they do. (ukri.org)

Information in youth players in both genders are also present throughout the literature (4), suggesting greater development for quadriceps muscle compared to hamstring for girls after menarche and therefore a higher risk for ACL injuries. (footballscience.net)

An eccentric contraction is the motion of an active muscle while it is lengthening under load. (wikipedia.org)
Each variation included modifications to the range of motion of the joint being emphasized during the eccentric portion of the depth jump. (thesportjournal.org)

Anatomy11

Diseases5

Chemicals and Drugs2

Analytical, Diagnostic and Therapeutic Techniques and Equipment5

Psychiatry and Psychology1

Phenomena and Processes10

Anthropology, Education, Sociology and Social Phenomena1

Information Science1

Isokinetic11

Muscles17

Doing eccentric muscle contractions1

Maximum voluntary contraction3

Hamstring to quadriceps ratio2

Hamstrings5

Torque17

Peak3

Strength21

Squat3

Exercises8

Gluteal1

Plyometric4

Decreases1

Squats1

Resistance4

Stretch2

Velocities1

Flexion1

Dumbbell1

Exercise10

Force14

Phase9

Ratio1

Tension2

Gravity2

Joints1

Shock2

Overload1

Produces1

19982

Activation3

Sarcopenia1

Greater1

Motion2