INTRODUCTION

According to WHO (World Health Organization), the majority of the population of economically developed countries is overweight (about a third of the population is 20% or more overweight than normal), moreover, this is also observed in people of a relatively young age who lead a sedentary lifestyle [1-3]. In overweight and obesity not without reason they see one of the most common causes of not only the loss of normal capacity and diseases (metabolic and others) but also premature death [4, 5]. According to statistics, among people of a certain age, the mortality rate is proportional to the amount of overweight [6, 7]. Almost twice as many obese people die from cardiovascular diseases than their peers with normal weight [8-11].

The primary role in solving this problem is assigned to physical culture and sports (along with the rationalization of nutrition, of course) [12]. The special value of physical education means in this regard lies in the fact that they allow, even in many cases without resorting to a sharp restriction of nutrition, to normalize the ratio of the structural components of the body based on the expenditure of fat resources for the energy supply of motor activity, the activation of which is associated with a general increase in functional capabilities of the human organism and the proportion of active (muscle) structures [13-18].

In recent years, there have been more and more cases of overweight among high school students. According to the study, 20-25% of high school students need to reduce body weight [19-21]. However, we have not found a solution to this problem in scientific and methodological works. All this suggests that the problem of preventing and combating obesity is a serious one. The need for weight correction in high school students in physical education classes has therefore become a matter of urgency.

MATERIALS AND METHODS

Participants

The study involved students (young men) of the senior classes of SBEI № 1383 in Moscow. The body mass index (BMI - body mass index) s a measurement calculated in 1869 by Adolphe Quetelet, the father of scientific statistics. It determines whether a person's height and body weight match identifies underweight or overweight, and allows a diagnosis of a certain degree of obesity to be made [22, 23]. After determining BMI overweight young men were identified. Their total number was 28. Two groups were formed by random sampling, one experimental and one control group of 14.

Procedure

During the 4 months, the two groups were engaged in physical education classes 3 times a week for 40 minutes in a comprehensive school setting. The classes were organized according to a conventional scheme, consisting of three interrelated parts. The preparatory part took 6-7 minutes, the main part 30 minutes and the final part 3-4 minutes.

In the control group, the classes were conducted according to the usual complex program for pupils in grades 1-11 of the comprehensive school. In the experimental group, the classes were conducted once a week using "fusion circuit training" (in the main part of the class).

This form of "circuit training" was based on continuous, prolonged work of moderate and greater intensity. The exercises composing the "circle" were selected according to the general symbol of "circuit training", i.e. according to the rule of consistent exposure to all major muscle groups. The exercises were performed in series, repeatedly, without pauses. The time allotted to complete the "circle" and the number of repetitions of the "circles" were determined by the maximum repetition test, the so-called repetition maximum – RM (a preliminary rough estimate of the individually available maximum repetition of each exercise for 1 minute, or a slightly longer or shorter time, depending on the difficulty of the exercise) [24-27].

The initial training time was set so that the boys could complete at least one whole circle in a single class without pauses, repeating each exercise for at least 1/2-1/3 of the RM. Then the number of repetitions of the exercises in the "circle" (e.g. up to 3/4 PM) was increased without prolonging the initial total time of the "circle" if possible, as well as the number of the "circles" (e.g. up to 2-3) [28-30].

RESULTS AND DISCUSSION

The final stage of our study examined the impact of the experimental technique in physical education lessons on the BMI and physical fitness of high school students. The results are shown in Tables 1 and 2.