Avaliação da taxa de produção de força e torque em indivíduos com espasticidade pós-avc

Abstract

The aim of this study was to compare the rate of force development (RFD) and maximum torque in spastic stroke survivors and healthy individuals. Fifteen stroke survivors (57.3 ± 11.2 years) with ankle spasticity and fifteen healthy individuals (59.3 ± 6.4 years) participated in this study. An isokinetic dynamometer was used to maximum voluntary isometric contraction (MVC) and RFD assessment of plantar flexors muscles of ankle, which the individuals were instructed to produce maximum torque as fast as possible. The absolute RFD was normalized by MVC (relative RFD). In results were observed significant differences in RFD of affected limb (43.3 ± 8.5 Nm/s) and unaffected limb (98.9 ± 20.4 Nm/s) compared to healthy (186.2 ± 25.2 Nm/s), but with no differences between affected and unaffected limbs (p=0.15). In relation to relative RFD, the affected limb (9.76 ± 1.1 %MVC/s) was significant different than healthy (13.08 ± 1.5 %MVC/s). The MVC produced by affected limb (46.55 ± 7.98 Nm) was significant lower than unaffected limb (84.29 ± 8.47 Nm) and, the two limbs of stroke survivors were weakness than healthy individuals (128.02 ± 9.36 Nm). Lastly, the spasticity level present higher negative correlation in relation to RFD (R=-0.725; p= 0.002) and MVC (R=-0.717; p=0.003). The spasticity promotes alterations in capacity to produce maximum force and fast force in affected and unaffected limbs of stroke survivors compared to healthy.

Effects of Pelvic Stability Training on Movement Control, Hip Muscles Strength, Walking Speed and Daily Activities after Stroke: A Randomized Controlled Trial

“…Due to the methodological limitations of a handheld dynamometer, we could not test the phasic isotonic contraction of hip flexors and adductors, but measured their isometric strength at certain joint angles. After pelvic stability training, the improvement in the isometric strength of these muscles might be related to more motor unit recruitment, re-organization of muscle fiber structure and increased rate of force development as an adaptive response [27, 28]. However, the use of isokinetic dynamometer in future trials shall provide a genuine change in the hip muscles strength following pelvic stability regime.…”