Comparação do efeito agudo do alongamento passivo-estático em indivíduos pouco flexíveis e muito flexíveis

• Ano de defesa: 2011
• Autor(a) principal: Beatriz Magalhaes Pereira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Flexibilidade; Músculos posteriores da coxa; Eletromiografia; Ressonância magnética; Alongamento; Exercícios físicos; Biomecânica; Articulações Amplitude de movimento; Membros inferiores; Educação física; Músculos
• Link de acesso: http://hdl.handle.net/1843/BUOS-8PQH4D

Stretching exercises is usualy employed in flexibility training and physical activity programs. However, there still is a considerable lack of information regarding the effects of stretching in subjects with different leves of flexiblity. The aim of the presente study was to compare the passive stiffness normalized by the cross sectional area (CSA) of the hamstring muscles, the joint range of motion determined by increased electromyography activity (ROMEMG), and the joint range of motion corresponding to the first sensation of tightness in the posterior thigh muscles similar to that of a static stretch maneuver (FSTROM), between flexible and inflexible subjects. Eighteen men and 18 women (19-30 years) were distributed in two groups according to their ROMEMG. Both lower limbs were analized. The subjects with either less than 90° or more than 95° of passive knee extention on the Flexmachine were allocated in the Low flexibility group or High flexibility group, respectively. Both groups were subjected to two conditions: Training (4 sets of 30s of static-passive stretching of the right hamstrings) and Control (rest of the left limb for 4min). The tests followed three stages: 1st) familiarization; 2st) Pre-test (ROMEMG, FSTROM, and torque measured by the Flexmachine); Training or Control conditions; Post-test (same measurements of pre-test); and 3st) CSA of hamstring muscles measured by magnetic resonance. Passive stress was calculated by dividing the passive torque by the CSA. The normalized passive stiffnes was calculated in the third portion of the passive stress- ROMEMG curve. The results demonstrated ICC=0.96-0.98 and SEM=1.24°-2.20° for the ROMEMG; ICC=0.95-0.98 and SEM=1.97°-2.18° for the FSTROM; and ICC=0,95- 0,98 and SEM=0,15-0,21 N.m.cm²/° for the normalized passive stiffness in both groups, and ICC=0.98 and SEM=0.59cm² for the CSA. The results showed that the stretching protocol promoted increases of 7.6° e 6.9° in the ROMEMG and 9.7° e 6.8° in the FSTROM for the High (p<0.05) and Low flexibility groups (p<0.05), respectively. However, there were no differences for normalized passive stiffness values after the stretching program in both groups (p>0.05). These results indicated that the stretching protocol significantly increased ROMEMG and FSTROM of both groups and the changes were similar between the groups. The normalized passive stiffness remained similar after stretching in both groups