Studies of features of external dynamics characteristics of motor actions of a swimmer considering the individual force course of the stroke (evidence from the crawl swimmers)

Aim: to estimate speed-force parameters of external dynamic characteristics of the stroke expressed in their standards (kg, s). To estimate the effectiveness of the individual force course of the stroke combined with the manifested “force impulse”. The research involved swimmers Arapov and Zaripov, 15-year-old, certified Candidates for Master of Sports (CMS), the trainees of Youth Sports School “YUNIKA”, Chelyabinsk. We estimated a special and a physical fitness of the crawl swimmers, and the named fitness was based on the speed-force indices of external characteristics of the arm stroke. We used the hardware system including: the water-pressure sensor (WPS), the water-pressure register (WPR) (patent 04.27.2012, № 115475). It was the first time ever when RGD device was used (stroke movement register). The swimmers did all the exercises being in free swimming mode. After computer processing the obtained graphic images of the individual force stroke course made it possible to distinguish a speed-force structure of the stroke. It was found: athletes have unstable force field with the prominent fluctuations which may decrease the median force potential. The effect of the support stroke part may influence the value of the “force impulse” and its duration. Consequently, the force field in the main part of the stroke has to be uniform, without prominent peaks. The reasons are to be searched for in the technique-strength training methods.