masterThesis
Influência da fadiga no comportamento neuromuscular do quadríceps femoral, após reconstrução do ligamento cruzado anterior
Fecha
2010-05-14Registro en:
MACIEL, Nícia Farias Braga. Influência da fadiga no comportamento neuromuscular do quadríceps femoral, após reconstrução do ligamento cruzado anterior. 2010. 74 f. Dissertação (Mestrado em Movimento e Saúde) - Universidade Federal do Rio Grande do Norte, Natal, 2010.
Autor
Maciel, Nícia Farias Braga
Resumen
Muscle fatigue is a phenomenon that promotes physiological and biomechanical
disorders and their changes in healthy subjects have been widely studied and have
significant importance for care in preventing injuries, but we do not have many
information about its effects in patients after ACL reconstruction. Thus, this study is
to analyze the effects of fatigue on neuromuscular behavior of quadriceps after ACL
reconstruction. To reach this objective, participants were forty men, twenty healthy
(26,90 ± 6,29 years) and twenty after ACL reconstruction (29,75 ± 7,01 years) with a
graft of semitendinosus and gracilis tendons, between four to six months after
surgery. At first, there was an assessment of joint position sense (JPS) at the
isokinetic dynamometer at a speed of 5°/s and target angle of 45° to analyze the
absolute error of JPS. Next, we applied the a muscle fatigue protocol, running 100
repetitions of isokinetic knee flexion-extension at 90°/s. Concurrently with this
protocol, there was the assessment of muscle performance, as the peak torque (PT)
and fatigue index, and electromyographic activity (RMS and median frequency).
Finally, we repeated the assessment of JPS. The statistical analysis showed that
patients after ACL reconstruction have, even under normal conditions, the amended
JPS compared with healthy subjects and that after fatigue, both have disturbances in
the JPS, but this alteration is significantly exacerbated in patients after ACL
reconstruction. About muscle performance, we could notice that these patients have
a lower PT, although there are no differences between the dynamometric and EMG
fatigue index. These findings show the necessity about the cares of pacients with
ACL reconstruction in respect of the risks of articulate instability and overload in
ligamentar graft