Efeitos de diferentes intervalos de recuperação entre séries de exercícios isocinéticos nas respostas metabólicas e neuromusculares na performance muscular em crianças e adolescentes

AUTOR(ES)

José Carlos de Britto Vidal Filho

DATA DE PUBLICAÇÃO

2009

RESUMO

PURPOSE: To compare the effect of two different between set RI of isokinetic knee extension exercise on Peak Torque (PT), Total Work (TW), and Blood Lactate (BLa) between children and adolescents. METHODS: 18 children (11.1 0.52 yrs) and 18 adolescents (15.8 0.49 yrs) performed 3 sets of 10 unilateral isokinetic knee extension repetitions at 60/s. The between set RI were 1 and 2 minutes and were randomly divided across 2 testing days, separated by a minimum of 72 hours. Pubertal stage was determined according to Tanner and Whitehouse (1976). RESULTS: There were no significant differences in PT and TW within any of the 3 sets and any of the RI (1 vs 2min) in the children group at both contraction velocities (60/s and 180/s). However, adolescents reported a significant (p<0.05) lower PT and TW in the 2nd and 3rd set when compared to the first set. Also, PT was higher in the 2nd and 3rd sets during the 2min RI in the adolescent group at 60/s and at 180/s. Bla was significantly higher than baseline after 1 min (1.04 0.23 to 2.55 0.47 mM) and 2 min (1.05 0.20 to 2.58 0.47 mM) RI for the children group, and after 1 min (1.17 0.18 to 6.59 1.07 mM) and 2 min (1.18 0.17 to 6.03 0.84 mM) RI for the adolescents group. However, after exercise, Bla was significantly higher in the adolescents as compared to the children in both RI. CONCLUSION: These results suggest that adolescents exhibit the capacity to produce greater muscular force, and as a consequence may develop a higher level of fatigue than children. Also, lower BLa suggests that childrens true advantage may decrease in the shorter delay between the onset of exercise or its completion and the peaking of metabolites in the blood, allowing the recovery process to initiate earlier.

ASSUNTO(S)

intervalo de recuperação adolescentes fadiga pico de torque ciencias da saude exercício isocinético crianças

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