Objective of the study was to study the bioelectrical activity of the leg muscles of academic winter footballers while balancing on a slippery surface. Methods and structure of the study. Sampled for the study were the 21-25 year-old (3rd-4th years of study) male students specializing in winter football (n=20). All subjects were asked to perform two attempts per exercise: "half-squat jump" with landing on the unstable platform Reebok Core Board RSP-21160. During the second attempt, the slide board GYMSTICK Power Slider 61131-PRO was attached to the 17 cm high platform. The slide board was 4.5 cm high. During the first attempt, the unstable platform was raised 21.5 cm high. During the exercise, the bioelectrical activity of the following take-off leg muscles was recorded: calf muscle/ gastrocnemius (lateral and medial heads), rectus femoris, adductor longus. The bioelectric muscle activity was registered using a multifunctional computer complex "Neuro-MVP-4" (Neurosoft, Russia). The electrodes with the diameter of the electrically conductive surface of 1 cm2 and electrode spacing of 20 mm were used. The grounding electrode was placed on the opposite limb. The maximum and average bioelectrical activity amplitudes (µV), as well as the average frequency of bioelectric activity (Hz) were recorded. The statistical processing of the data obtained was carried out using the STATISTICA 10.0 software package. Results and conclusions. The findings helped determine the main regularities in the lower limb muscle work organization of winter footballers while balancing on an unstable slippery surface. All totaled, the results obtained suggest that it is the rectus femoris and calf muscles that are actively involved in the maintenance of equilibrium when jumping on a slippery surface, but the nature of their work changes significantly - the activity of the motor units is desynchronized, while the number of motor units involved grows. In contrast, the activity of the adductor longus in these conditions is decreased. According to the findings complex coordination skills when playing on a slippery surface are associated with the development of specific movement patterns. Special training programs are required to build the balancing skills and movement coordination of winter footballers.
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