—The paper presents results of a comprehensive study of ferromanganese crusts from a submarine volcano on the Sonne Ridge, which was discovered during the 178th cruise of the RV Sonne (2004) investigating the northern slope of the Kuril basin in the framework of the KOMEX program. Results of study of the structures, textures, and mineral and elemental compositions of the crusts suggest their hydrogenous origin. The contents of major, trace, and rare-earth elements and Y (REY) in four mineral phases of ferromanganese crusts of the Sea of Okhotsk have been determined by phase analysis for the first time. The REY patterns of the manganese and ferrous in-situ phases confirms the hydrogenous genesis and indicates no hydrothermal influence.
Objective: to assess the suitability of existing domestic and international recommendations and standards for the use of echocardiography as a screening technique for examining athletes with various diseases.Materials and methods: a meta‑analysis of 59 domestic and foreign literature sources based on the results of an echocardiographic examination of athletes was carried out. The indicators of 2647 male athletes aged 16 to 45 years old, playing for the national teams of the city of Moscow and having passed an in‑depth medical examination at the Sports Medicine Clinic, were studied.Results: screening echocardiography sufficiently reveals structural deviations of the heart of athletes from population norms, including congenital or acquired pathologies that cause both sudden death and general morbidity compared with a healthy population.Conclusion: in order to speed up and reduce the cost of the examination of athletes, it is appropriate to use the primary screening, and if necessary, an in‑depth examination. In this case, it is advisable to distinguish three diagnostic stages that determine the danger or admissibility of playing sports: (A) — the risk of developing complications, (B) — the presence of structural changes in the heart, and (C) — the appearance of clinical symptoms.
The myocardial remodeling of athletes heart is an essential process that occurs in sport exercises. However, depending on the type of load, remodeling can be of different type. An endurance load leading to eccentric cardiac remodeling, whereas power loads cause a concentric transformation of heart. Even in a same sport particular types of load can be different. This causes lead to difficulties in the differential diagnosis of physiological and pathological remodeling. Furthermore, it is believed that there must be sufficient time remodeling. We described the clinical observation, in which the athlete in the same sport, by changing the particularly of the training loads, there is objectively determined transformation of the myocardium in a relatively short period of time.
Objective: assess the suitability of existing domestic and international recommendations for the use of echocardiography as a screening method for examining athletes; to select standards that characterize the heart in different sports, based on their own research.Materials and methods: a meta‑analysis of 38 domestic and foreign literature sources based on the results of an echocardiographic examination of athletes was carried out. The indicators of 2647 male athletes aged 16 to 45 years old, playing for the national teams of the city of Moscow and having passed an in‑depth medical examination at the Sports Medicine Clinic, were studied.Results: heart sizes in athletes differ slightly from population indicators, however, in 14–45% of cases they go beyond the reference values. In the absence of heart disease, the largest dimensions of the left ventricle (LV) are observed in endurance exercisers. At the same time, high functionality correlates with increased LV volume indexed by BCA (for EDV/BSA and VO2 AT r = 0.52, p < 0.05).Conclusion: echocardiographic screening of athletes allows obtaining sufficient information to identify congenital or pathology that has arisen during excessive training loads. As standards, it is advisable to use population indicators expressed in centile values.
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