According to literature, it is important not to change body composition when reducing body mass. It has been intended to examine muscle force changes when reducing body mass rapidly and averagely rapidly. Research aim was to estimate the effect of methods reducing body mass (rapid, averagely rapid) on wrestlers` changes in body mass components and force. Research methods. Groups of research participants: one - wrestlers who did not reduce body mass (n = 47), two - wrestlers who reduced body mass rapidly (n = 16), three - wrestlers who reduced body mass averagely rapidly (n = 9). Muscle force (dynamometer MMT) and mass components (bio-impedance method Tanita 300) were estimated before and after reducing body mass. Research results. Before reducing body mass (rapidly, averagely rapidly) wrestlers` body mass was greater (p < 0.05) than after reducing it. Wrestlers lost 4.5% of body mass when reducing it rapidly (24-72 hours), when averagely rapidly (72 hours - 2 weeks) - 4.03%. After reducing body mass fat free body mass decreased tendentiously. Using rapid method, wrestlers` force of both legs diminished (p < 0.05), when using averagely rapid method, force of left leg diminished (p < 0.05). Force of arms decreased (p < 0.05) after reducing body mass by both methods. Discussion and conclusions. Subjects used aggressive method of reducing body mass. They need appropriate training about athlete nutrition, optimal reduced body mass. Tendentious decrease in free body mass shows decrease in muscle force. Force in arms and legs significantly decreased for wrestlers using rapid and averagely rapid methods for reducing body mass.
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