It has been observed that training influences modulation of autonomic activity and it can be represented in Heart Rate Variability (HRV). Evaluation of HRV can be useful to obtain information about the internal load to which an individual is being subjected, in order to adjust training loads, either with the aim of increasing sports performance or to prescribe an adequate load to improve specific qualities for the sport. Therefore, the purpose of this study was to evaluate the behaviour of autonomic modulation and its association with performance in a jump test, in university players of Rugby Seven. 11 men who belonged to the university team (age 23.63 ± 2.15 years; weight 84.43 ± 10.44 kg; height 1.80 ± 0.04 m), national champion of Colombia in the year 2016 of Rugby Seven, were volunteers for the research. Abalakov jump, CMJ, SJ and DJ were evaluated. We evaluated the behaviour of the autonomic modulation, in controlled resting situation, controlled ventilation, orthostatism, exercise and recovery. Main result of this study was evidence that sympathetic modulation can be reflected in the development of force to execute a jump; because association found between the low frequency component of heart rate variability (2238.364 ± 1381.531 ms 2 /Hz) and performance in DJ (22.3 ± 3.66 cm) (r=0.65, p=0.029).

The main aim of this study was to evaluate the concordance between the indirect V̇O2max value estimated by the distance achieved in the Yo-Yo intermittent recovery test level 1 (YYIR1) and the direct measurement during a treadmill protocol test (TP) in elite youth soccer players. Methods: Fourteen elite under 20 year's old soccer players from a first division soccer club were evaluated. Test were performed one week apart. In both tests V̇O2, was measured with an ambulatory gas exchange measurement. YYIR1 estimated V̇O2max was calculated using the equation described by Bangsbo et al. (2008) and in TP was calculated using American College of Sport Medicine equation. Results: Lin´s concordance correlation coefficient between direct V̇O2max in TP and estimated V̇O2max in YYIR1=0.271 (poor concordance). Conclusions: The poor concordance between direct and indirect V̇O2max measurements in TP and YYIR1, indicated that in an elite population both

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Background: The CONMEBOL Libertadores Cup, is the continent's most important international club tournament. Teams are exposed to different altitudes with short acclimatization periods. The present study describe the effect of altitude on the results and goals of soccer club teams matches between 2000 and 2015 in the CONMEBOL Libertadores Cup. Materials & Methods: All home and visiting matches from the group phase onwards and which have been played at the traditional team venue were taken into account, thus, 2039 games were analysed. The teams were classified into altitude categories according to the physiological impact and registered hometown altitude. Poisson´s generalized linear model was used to study the relationship between the altitude of both home and visiting teams and the number of goals scored for each team according to the altitude category. The probabilities that the home team winning, drawing, or losing the match were estimated using a regression model for ordinal variables and assuming a multinomial probability distribution with the logistic linkage. Factors as heat, temperature and general performance of the teams were not considered. Results: Local team scores more (2.62 goals) when the visiting team descends three altitude categories, followed by a descent of two altitude categories (2.01 goals) and an ascent of three altitude categories (1.89 goals). This is associated with an increase probability of winning for the local team, being 5.5 times more likely when the visiting team descends three altitude categories, 2.3 times more when it descends two categories, and 2.5 times more when it ascends three altitude categories. Conclusions: These findings suggest that the visiting team is more likely to lose a match when it has to descend two or three altitude categories and when it ascends three altitude categories.

Purpose: Describe injuries and factors that affect athletes with physical, and sensory-visual disabilities of the Bogotá team. Methods: 165 data from medical records of athletes with disabilities of Paralympic movement members of Bogotá team in the period between 2013 -2015 (men 81%, women 18%, age 32.3±12.04) were chosen for this study. Results: The prevalence of injuries found in the Bogotá selection was 60% with a proportional incidence of 2.09 injuries / athlete. The most common lesion location was the upper extremities (46%). The most injured anatomical structure was muscle (31%). Athletics are the sport with higher prevalence of injuries. Of the 345 injuries, 90% were presented in the training of the athletes, with the gradual onset of the lesion being greater (56.5%). Main cause of the injuries are due to overuse mechanism (68.4%). Conclusions: Investigations like these, are the basis for very specific prevention programs for Paralympic athletes.