Hamstring strain injuries are very common in sport at all levels .They lead to significant costs, as well as an increased future risk of other injuries. So, it is important to realize which exercises are the most beneficial ones.
Dear Dr Jamali,
I found some articles may can help you. please have look on them.
https://pdfs.semanticscholar.org/4ce1/eefea3fa46bcfb75fbf6c0bac392fd9f5dfa.pdf
https://www.sciencedirect.com/science/article/abs/pii/S0894113016301302
Article Maximal-intensity isometric and dynamic exercise performance...
Es importante trabajar la carga excéntrica teniendo en cuenta que es donde se presentan mayormente lesiones. Estoy de acuerdo que se debe estudiar la pertinencia, es decir cual es el mas adecuado de acuerdo a la necesidad.
Pegah Jamali See https://bjsm.bmj.com/content/53/7/449
Eccentric hamstring strength training is the most widely researched and recommended evidence-based strategy for Hamstring Strain Injury (HSI) prevention and has been shown to significantly reduce the risk of primary and secondary HSIs (65%–85%). Eccentric strength training also results in alterations of muscle architecture, specifically elongation of the biceps femoris long head (BFlh) fascicle length (16%–34% after 5–10 weeks of eccentric strength training), although not always. I personally think eccentric exercises are better than isometric.
Pegah Jamali
As you know, there are three kinds of muscle contractions (isometric, isotonic and isoki etics). All of them offers some kind of strenghing method. Each one of those methods is specific for a special circunstance. And anyone of those strenghing methods have different uses. A better strengh training I consider the pleometrics, for individuals without injuries. Using pleometric as preventive method.
Both can certainly be useful, but it's important to keep in mind that the majority of non-contact, acute, muscular sports injuries happen during eccentric contraction. The muscle being lengthened under stress, in addition to the fact that the resistance is acting on the muscle in an eccentric contraction, rather than the muscle acting on the resistance (as in a concentric action). As with any great injury prevention program, a primary goal should be to expose athletes to certain stresses that can be dangerous if imposed at greater levels, to enable the body to adapt and increase its capacity to handle such loads/stresses (i.e. high eccentric forces the hamstrings might deal with during something like top-end sprinting).
In that regard, eccentric training seems to be king, as seen in a lot of the literature regarding NHC in the role of hamstring injury prevention: https://journals.sagepub.com/doi/abs/10.1177/0363546515574057
Also, in my opinion, eccentric training for injury reduction doesn't just have to be slower tempo eccentrics. Supramaximal eccentrics and high-velocity eccentrics also have their place in an injury prevention program, as an athlete may be exposed to both on the court, field, pitch etc.
Please follow these papers regarding your question
Recommendations for hamstring injury prevention in elite football: translating research into practice
Preventing hamstring injuries-Part 2: There is possibly an isometric action of the hamstrings in high-speed running and it does matter
Hamstring strain injuries: recommendations for diagnosis, rehabilitation, and injury prevention
Preventing hamstring injuries is a major consideration for strength and conditioning coaches in field sports. Hamstring injuries have a 12-14% recurrence rate, with the re-injury often requiring more days away from training and competition than the initial trauma. Reducing an athlete’s risk of a hamstring injury is therefore one of the most important investments a strength and conditioning coach can make with his training time.
Hamstring injuries have long been the bane of athletes' participation in sport among those who engage in sprinting and explosive movements, primarily because of both the high occurrence and recurrence rates. These injuries appear to create a subsequent weakness at the muscle's lengthened state, predisposing the athlete to further injury. Lengthened state eccentric training may increase the end range strength resulting in fewer reinjuries and therefore should be incorporated in the rehabilitation process. Further research is needed to determine the effect of lengthened state eccentric training on the incidence of hamstring strain reinjury.
https://bjsm.bmj.com/content/53/7/449
https://cpb-us-w2.wpmucdn.com/sites.udel.edu/dist/c/3448/files/2016/10/HAMSTRING_EXERCISE_PROGRESSION_2015-27tkw2u.pdf
Dear Pegah Jamali , According to force-velocity curve muscle contraction, Muscles are capable of generating greater forces under eccentric conditions than under either isometric or concentric contractions. (1)
To understand how eccentric exercise produces more force and how it can help to prevent injuries, you should know the mechanism of that, which I have explained in my article Article Investigating Eccentric Contraction Mechanism in the Prevent...
1- https://www.sciencedirect.com/topics/medicine-and-dentistry/eccentric-muscle-contraction
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