THE EFFECTS OF 21 DAYS HYPOXIA ON ELECTROMYOGRAPHIC ACTIVITY VARIATION IN ROWERS PRE AND POST-ALTITUDE.

The purpose of this study was to determine and to compare EMG characteristics of the vastus medial quadriceps in Chilean rowers in hypoxia. The sample was 11 Chilean elite rowers. The evaluation procedure consisted of every subject performing a maximal test of incremental ergospirometry intensity until fatigue. The EMG analysis was implemented when the sportsmen reached the VO2max intensity with wireless EMG. In the analysis, RMS EMG signals were utilized. The results showed a significant difference between EMG activity in normoxia pre-altitude and normoxia post-altitude after 21 days in hypoxia

ELECTROMYOGRAPHIC INTER-LIMB ASYMMETRY IN BENCH PRESS EXERCISE IN ELITE PARALYMPICS WEIGHTLIFTERS

The purpose of this study was to describe inter-limb asymmetry in three muscle groups in a sample of Paralympic weightlifters during an 80% RM bench press. The sample was composed of 7 subjects belonging to the Chilean elite powerlifting. Surface electromyography was assessed in major pectoral, deltoid anterior and triceps brachii. The magnitude of the response was calculated through root mean square (RMS). Symmetry Index was calculated for an interlimb differences measure. Only the pectoralis major muscle showed significant differences between limbs (right 84.7 ± 41.3; left 66.1 ± 19.3 RMS) (p=0.05) and the SI median greatest value (19.74 ± 24.59%). Anterior deltoid showed high individual differences in two athletes with upper 80% SI values. More studies should assess asymmetry with the objective to decrease this injuries risk factor

CORRELATION BETWEEN JUMP HEIGHT AND BIOMECHANICAL VARIABLES IN CHILEAN ATHLETES OF TEAM SPORTS

I In elite team sports technical skills and explosiveness are essential to get the optimum performance, being the vertical jump one of the most important motor skills in competition, usually assessed by countermovement jump (CMJ). The main aim of our study is to determine the correlation between jump height and kinetic and kinematic variables using force platforms, and secondly to describe CMJ values of elite Chilean team sports athletes. The results obtained in our study showed a positive correlation between jump height and concentric mean power, concentric peak velocity, concentric peak power and total concentric impulse. These results are fundamental for an optimal analysis of athletes jumping tests, based on data from the specific study population and the use of those variables that are most related to their performance

PHYSICAL AND BIOMECHANICAL ASPECTS THAT CAN INFLUENCE THE PREFERENCE FOR THE UCHIMATA TECHNIQUE IN JUDO: A CASE STUDY

The aim of this study was to compare the handgrip strength, flexibility level (sit and reach test), kumikata and biomechanical aspects of the uchimata technique of two national level judokas, one who favors to use the uchimata (tokui-waza), and one who selects another judo technique in combat. We recorded the highest value of three attempts for handgrip strength (handgrip test), and flexibility (sit and reach); we recorded the highest value of three attempts for strength (handgrip test) and flexibility (sit and reach test); we analyzed the uchimata phases (kuzushi, tsukuri, kake and zanshi) in 3D using Vicon® system. We found that non-traditional kumikata during combat (grips with both hands on the same side), greater level of flexibility (45 vs. 36 cm), greater leg opening distance (113 vs. 66 cm) and greater displacement speed of the center of mass performing the technique (75 vs. 49 cm/s) may be indicators for the choice of uchimata technique as tokui-waza