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Morphobiomechanical changes in quadriceps femoris muscle of schoolchildren during isometric and isokinetic exercises

2003; Volume: 2003; Issue: 3 Linguagem: Inglês

10.5628/rpcd.03.03.64

2182-0317

G. Knipshe, Leonīds Čupriks,

Physical Education and Training Studies

Success in any kind of sport is determined by a definitive relation of such physical qualities as strength, speed, endurance, ability and coordination (1).In most kind of sports the most important is not absolute strength but its distribution in time period.Therefore, evaluation of level of speed and strength ability and its further development is very important in selecting children for sport (2, 3).Thirty five 8-10 years old schoolchildren of both gender took part in our research.By the help of the dynamometric device REV 9000 made by the company "Technogym" we monitored changes in strength of quadriceps femoris in a time period, which allowed to evaluate visually the process of muscle contraction and relaxation, as well as the importance of strength and changes in its speed in a time period.The statistic analysis of the data showed great differences of maximal strength and relaxation speed.The comparison of contracting and relaxation in the obtained curves allowed us to distinguish different variants of muscle contracting and relaxing relation.We found the following variants of the relationship of muscle contraction and relaxation: (i) children with very fast muscle contraction and very fast relaxation; (ii) children with fast muscle contraction and fast relaxation; (iii) children with fast muscle contraction but slowly relaxation; (iv) children with slowly muscle contraction but fast relaxation; and (v) children with slowly muscle contraction and slowly relaxation.