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Introduction: core stability is the ability to control the position and movement of the trunk related to the pelvis through the production of force by the core muscles. Maintaining adequate strength in the core muscles is considered important in rehabilitation processes, for physical and sports performance, and to prevent injuries. Some studies have reported how core stability training can improve physical performance. However, other research questions whether core training can bring about positive changes. Objective: to identify the effects of core stability training on some physical performance variables such as power, speed, agility and balance. Material and methods: a bibliographic search was carried out in PubMed, SCOPUS, PEDro and EBSCO,additionally relevant manuscripts were identified from Google Scholarusing the search terms "Core Stability, Athletic Performance, and Resistance Training". Results: the core stability programs reported increases in the muscular power of the extremities, in the same way, they allowed to improve speed and agility in different athletic tests. Relatively few studies report effects on balance. However, these show promise for improving static and dynamic balance. Conclusion: core stability training is an effective strategy to improve physical performance, different professionals linked to sports and physical exercise can benefit from this strategy when they need to enhance physical performance by including programs of this nature in their periodizations and exercise planning. [ABSTRACT FROM AUTHOR]

Introduction: the anterior cruciate ligament rupture is the most common injury in athletes and could compromise their professional careers. Surgical reconstruction is the primary and most effective treatment. There are many questions about which graft to use since each one has been associated with different side effects. The objective of this literature review is to identify the side effects of each type of graft used in the reconstruction of the anterior cruciate ligament. Material and method: a literature search was conducted in SCOPUS, PubMed, Google Scholar and PEDro, using the following search terms "Anterior Cruciate Ligament Reconstruction, Autografts, Allografts, Return to Sport, Muscle Strength, Pain and Joint Instability. Results: the hamstring autograft and allografts reported less stability, while the bone-patellar tendon-bone autograft showed greater stability. On the other hand, it was reported that muscle strength will be compromised depending on the graft extraction site. Bone-patellar tendonbone autografts have been associated with greater anterior knee pain and the probability of developing osteoarthritis, in the same way, they are associated with less post-operative functionality and require more time to reach the milestones to return to sports activities. However, this autograft showed less probability of suffering a new rupture, on the other hand, with the hamstring autograft and allografts, there is the highest risk of a new injury. Conclusions: there are several strategies used in rehabilitation, however, knowing the effects of each type of graft used allows for further individualization of the treatment and facilitates the choice of which one to use for reconstruction. [ABSTRACT FROM AUTHOR]

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The human Chorionic Gonadotropin (hCG) by its effect similar to the one of LH, was used to improve the percentage of conception in mares, using frozen semen in the artificial insemination. For this, 20 mares cycling of natural way, belonging to the breed Cuato de Milla (Quarter Horse), in their reproductive age (6 to 12 years of age), were selected in a farm located in Mexico D.F. The animals were divided into 2 groups: Group 1; mares treated with 2000 UI hCG when presented Graff follicle equal or higher than 35 mm and inseminated 30 hours after the application of this hormone. Group 2; considered the control group in which insemination was made 30 hours after the mares presented follicle equal o higher than 35 mm by means of the ultrasound observation. For the artificial insemination, frozen semen in straw of 5 mL containing a total concentration of 1000 million spermatozoa was used. The gestation diagnosis was made by means of the observation of the embryonic vesicle in day 16 after the artificial insemination, with a transrectal ultrasound of 5 MHz. The results show that group 1 (mares treatment with hCG) have an 80% fertility percentage (8/10), whereas group 2 (control group), presented a 20% fertility (2/10). It is concluded that hCG helped to improve the pregnancy percentage in treated mares. [ABSTRACT FROM AUTHOR]