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DYNAMICS OF CHANGES IN THE LATENT TIME OF THE INDUCED MUSCLE CONTRACTION OF THE UPPER AND LOWER LIMBS OF QUALIFIED CROSS-COUNTRY SKIERS DURING THE TRANSITION TO THE STAGE OF HIGHER SPORTSMANSHIP (0.26 Mb, pdf) Read
Authors:
Len'kova Sof'ya Aleksandrovna
Salova Yulia Pavlovna
Annotation:

The research purpose is to study the reactions of the muscles of the upper and lower limbs in terms of latent induced contraction time (LICT) to a specific load of cross-country skiers during the transition to the stage of higher sportsmanship. A step-increasing test on the Concept2 SkiErg ergometer was used as a specific load.

Research methods. The state of the peripheral link of the neuromuscular apparatus was assessed using the "Chronax-7" device (LLC NTF "Micronix", Omsk) [2]. The state of the peripheral link of the neuromuscular apparatus was assessed before and after the step-increasing load on the Concept2 SkiErg ergometer [2,6]. The latent time of induced contraction (LICT) was assessed and the M-response was analyzed. LICT was recorded on the medial head of the calf muscle of the leg, as well as the lateral head of the triceps muscle of the arm. 
The study was carried out in the preparatory period of the annual cycle. The study performed for the first time made it possible to obtain a qualitative assessment of the state of the peripheral link of the neuromuscular apparatus of the upper and lower limbs of cross-country skiers. Various options for responses to step-increasing load were revealed. The dynamics of LICT of the muscles of the upper and lower limbs was analyzed. The change of LICT after loading was revealed. Performing stepwise increasing load can lead to a decrease or increase in LICT. It can be manifested by a lack of change in the latent time of the induced contraction.

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