Author(s): PLAVINA, L., Institution: NATIONAL DEFENCE ACADEMY OF LATVIA, Country: LATVIA, Abstract-ID: 499

INTRODUCTION:
The endurance training course is essential part of professional skills support for military personnel. The aim of the study is to provide an assessment of body composition` characteristics changes in a group of well-trained individuals depending on level of BMI (standard and overweight) in pre-course preparatory phase ,to endurance exercises, directly after endurance training and in four weeks after endurance training course
METHODS:
The study group included 66 healthy persons in aged from 21 till 35 years. They participated in pre-course training (four month) and endurance training course (ten days long total 24hrs), with high intensity physical load that included aerobic and anaerobic training elements, in combination with related energy deficiency (RED). Participants were divided into two subgroups according BMI levels: with standard level and with overweight level. We fixed in both subgroups body fat (%), muscle mass(kg) four times: at the beginning of pre-course training (1) no RED; after four months of pre-course training, directly before endurance exercises (2)no RED, directly after endurance training course (3)with RED and four weeks after endurance training course (4)no RED. The median and interquartile range (IQR) described non-normally distributed variables, data analysis was provided by Friedman`s test and by using IBM SPSS Statistics 29.
RESULTS:
The results revealed changes of body composition characteristics in both respondents` subgroups with standard BMI level (≤24,9) as well with overweight BMI level (>25,0). The median of body fat % had small changes during pre-course training (no RED) for respondents with standard BMI level (p>0.999) and with the overweight BMI level (p>0.999), the body fat % characteristics in third measurements directly after endurance course (with RED)decreased for respondents with standard BMI level (p<0.001) and with the overweight BMI level (p<0.001). These changes of body fat% were not stabile that fixed in fourth measurement in four weeks after endurance course(no RED) for respondents with standard BMI level (p<0.001) and with the overweight BMI level (p=0.079). The median of muscle mass(kg) had changes during pre-course training (no RED)for respondents with standard BMI level (p>0.999) and with the overweight BMI level (p>0.999), then characteristic of muscle mass measured directly after endurance training course( with RED) shown that they jumped up (in group with standards BMI (p<0.001) and in group with overweight BMI level(p=0.003). These changes diminished in four weeks after endurance course (no RED)and last measurement fixed that muscle mass returned to in initial level in group with standards BMI p=0.623 and in group with overweight BMI level (p=0.010
CONCLUSION:
Body composition characteristics were affected by intensity physical load and combination with RED or no RED for participants of both subgroups with standard and overweight level of BMI level, but changes of body composition characteristics were not longtermly.