On the subject of soccer injury prevention, there is a lot of evidence available in the writing. The viability of HLECM preparation instruments is unknown. They are, however, encouraged by the prospect of making the ligament more ‘load-safe’ and reversing the pathophysiological alterations that occur during this state.^[1],^[2] Following HLECM preparation, further studies have revealed a reduction in ligament size and auxiliary abnormalities, an increase in collagen amalgamation, and a decrease in neo-vessel ingrowth inside the Achilles ligament.^[3]

In soccer, physiotherapy plays an important role in preventing wounds and fierceness wounds through effective healing programs.^[4] Essential avoidance, optional anticipation, and tertiary anticipation are the three levels of wound counteraction.^[5] The term ‘essential degree of anticipation’ refers to specific mechanisms that are used to prevent harm or illness. All soccer players, for example, are required to wear shin guards. Hawkins and Fuller (2016) found that all of the players in the UK wore shin pads and did calm down activities after serious matches, however, none of the participants in the study agreed throughout the preparation.^[6] Fifty-three players reported that the training staff did not encourage them to use shin cushions during training or relax afterward.

Alfredson et al. (2016) created a novel eccentric training protocol that has now been widely used in other studies. This study compared the efficacy of HLECM training to a variety of other conservative Achilles Tendonitis treatments could be due to a variety of factors, such as the outcome measures used, participant compliance levels, and differences in HLECM protocol methodology, including training principles.^[7]

Outcome measures
When research populations change and multiple outcome measures are used, comparison of results across studies can be difficult. Previously, the research used just a visual analog scale (VAS) for pain and, in some situations, an interview method to determine satisfaction and return to sport.^[8] This latter method may be influenced by the therapist-tolerant relationship, especially if the interviewer is also participating in the study.^[7]

Methodological variations
In terms of training principles such as assets, repetitions, and frequency of performance, differences in technique between studies using the HLECM training regimen were rather minor. In some studies, the HLECM schedule was gradually implemented throughout the first several weeks or the frequency was dropped from twice a day (180 repetitions) to once a day (90 repetitions).^[9]-^[12] The HLECM training protocol’s progressions were probably more diversified. The study did not specify how much weight was added to each participant’s backpack, only that the exercises should continue to be unpleasant.^[7]

Muscle activity
In the investigation, the edge of knee flexion required to promote soleus muscle activation during HLECM training was not identified.^[7] The electrical activity of the soleus muscle has been studied at various knee joint angles, and the results show that it is highest from 40° to 90° flexion.^[13] This is assumed to be due to the occurrence of active insufficiency, which causes a comparable suppression of gastrocnemius activity in this position.^[13] Other research, on the other hand, has shown that the soleus muscle’s Electromyography (EMG) activity remains constant despite changes in knee and ankle joint angles.^[14] The knee-flexion angle is more than 90° in the bent-knee condition of HLECM training. As a result, it appears that the gastrocnemius would remain active and not reach the point of functional insufficiency during this state. It’s unclear whether bending the knee during HLECM training preferentially targets the soleus muscle in patients with Achilles tendon (AT).^[7] While there was a trend in the bent-knee condition for increased relative soleus activity and decreased relative gastrocnemius activity, the difference between the conditions was not statistically significant. In persons without Achilles tendon pain, the knee-flexion angle employed during HLECM training is likely insufficient to block gastrocnemius activity and preferentially target soleus.^[15]
Eccentric exercise has been shown to improve tendon structure, which historically was considered a mechanism for improvement in some persons with Achilles tendinopathy.^[16]
The quality and key findings of the research are outlined in Table 1 to determine what conclusions may be drawn currently.

The use of HLECM as an AT therapy has been widely concentrated. Although the outcomes are difficult to comprehend, a significant decrease in agony and an increase in work were observed following HLECM preparation in all experiments examined here. In any event, none of the examinations were replicated.^[7] The adequacy of HLECM preparation has been demonstrated to be comparable to shockwave treatment, extending, supporting, or late-night bracing. In any event, it is superior to concentric preparation. Heavy eccentric calf training is currently advocated for as the gold standard for treatment of mid-portion Achilles tendinopathy.^[17],^[18] Advantages and disadvantages of HLECM: Although not always obvious, eccentric muscle contractions are an integral part of most movements during daily or sports activities. Skeletal muscles contract eccentrically to support the weight of the body against gravity and to absorb shock or to store elastic recoil energy in preparation for concentric (or accelerating) contractions.^[19] Eccentric exercise may be effective in treating Achilles tendinopathy in part because of its effect on pain sensitivity. There is no strong evidence to suggest that eccentric exercise is harmful.

Eccentric exercise has been linked to clinical improvements in pain and function in Achilles tendinopathy patients. Regardless of the available evidence that eccentrics are effective, other options may be equally effective. To optimize outcomes, proper load modification and exercise recommendations for patients with Achilles tendinopathy necessitate systematic clinical thinking and the combination of patient values.

Abbreviations
HLECM: Heavy Load Eccentric Calf Muscle, AT: Achilles Tendinopathy, Reps= Repetitions, VAS: Visual Analogue Scale for pain, EMG: Electromyography, VISA-A: The Victorian Institute of Sports Assessment self-administered Achilles questionnaire

Acknowledgment
The authors would like to thank all participants who helped with the research in Physical Therapy Department, Jazan University, Saudi Arabia.

Conflicts of Interest
The author declares that there are no conflicts of interest relevant to this article.