Isokinetic dynamometry of knee flexors and extensors: comparative study among non-athletes, jumper athletes and runner athletes

Abstract

Participation in intensive sports activities leads to muscular specializations that may generate alterations in involved articular forces and cause static (posture) and dynamic changes (alterations of articular stability, coordination, etc.). Prevention of injury requires specific functional muscular evaluation in all athletes and for any kind of sport.OBJECTIVE: To dynamically evaluate, through isokinetic tests, the peak torque, total work, and average power of the knee flexor and extensor muscles of jumper and runner athletes and compare them to those of a non-athletic population, evaluating dominance and balance between agonistic and antagonistic muscle groups.RESULTS: In the non-athlete group, we noted a higher asymmetry between the dominant and nondominant members. The jumpers had the highest values of the evaluated parameters of all groups, whereas parameters for the runners were intermediate between non-athletes and jumpers.

Avaliação muscular isocinética da articulação do joelho em atletas das seleções brasileiras infanto e juvenil de voleibol masculino

“…The demand imposed to the knee joint through the sports practice results in specific muscle adaptations that may generate strength imbalances that has a static and dynamic action around this joint (13) . Such muscle imbalances may predispose athletes to injuries, as they produce high stress levels into the tissues (11,13) .…”

“…Such muscle imbalances may predispose athletes to injuries, as they produce high stress levels into the tissues (11,13) . Being so, it is necessary to set the parameters for the muscle function related to that joint in athletes.…”

“…Furthermore, isokinetic assessment allows identify muscle strength deficits both between the legs and between the agonist and antagonist muscles group in the joint evaluated (11)(12)(13) . There are several studies focusing the use of the isokinetic dynamometer in different populations (11)(12)(13)(14)(15) .…”

“…There are several studies focusing the use of the isokinetic dynamometer in different populations (11)(12)(13)(14)(15) . Nevertheless, there is few little information available about these measurements in volleyball athletes, especially related to lower limbs (16,17) .…”

Estudo das adaptações autonômicas, metabólicas e funcionais decorrentes da utilização do sistema de cargas seletivas durante um macrociclo de treinamento em atletas de basquetebol

“…O ponto chave para a melhora do condicionamento físico do atleta é precisamente o programa de treinamento físico aplicado (Marina, Jemni, 2014;Michel et al, 2014). Neste caso, é possível que a ausência de alteração sobre os parâmetros de força avaliados esteja relacionada com o sistema e a estruturação do treinamento utilizada no macrociclo em questão, uma vez que, no SCS, ênfase é dada ao aprimoramento das capacidades de velocidade e particularidades técnico-táticas (Gomes, 2002 (Siqueira et al, 2002). No presente estudo, o desequilíbrio desta relação se manteve em todos os momentos investigados, ou seja, P1, P2, P3 e P4, sugerindo a necessidade da inserção de trabalhos específicos em programas de treinamento para atletas de basquetebol.…”