Electromyographic patterns of lower limb muscles during apprehensive gait in younger and older female adults

Objective: Investigate the influence of apprehensive gait on activation and cocontraction of lower limb muscles of younger and older female adults. Methods: Data of 17 younger (21.47±2.06 yr) and 18 older women (65.33±3.14. yr) were considered for this study. Participants walked on the treadmill at two different conditions: normal gait and apprehensive gait. The surface electromyographic signals (EMG) were recorded during both conditions on: rectus femoris (RF), vastus lateralis (VL), vastus medialis (VM), biceps femoris (BF), tibialis anterior (TA), gastrocnemius lateralis (GL), and soleus (SO). Results: Apprehensive gait promoted greater activation of thigh muscles than normal gait (F=5.34 and p=0.007, for significant main effect of condition; RF, p=0.002; VM, p<0.001; VL, p=0.003; and BF, p=0.001). Older adults had greater cocontraction of knee and ankle stabilizer muscles than younger women (F=4.05 and p=0.019, for significant main effect of groups; VM/BF, p=0.010; TA/GL, p=0.007; and TA/SO, p=0.002). Conclusion: Apprehensive gait promoted greater activation of thigh muscles and older adults had greater cocontraction of knee and ankle stabilizer muscles. Thus, apprehensive gait may leads to increased percentage of neuromuscular capacity, which is associated with greater cocontraction and contribute to the onset of fatigue and increased risk of falling in older people. © 2013 Elsevier Ltd.

Hidroterapia e eletroterapia em ratos com denervação do nervo isquiático

Pós-graduação em Ciência Animal - FMVA

Variações goniométricas metatarsofalângica e interfalângicas e medidas do casco do membro pélvico de equinos submetidos à tenectomia do flexor digital medial (flexor longo do halux)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Análise eletromiográfica e de acelerometria na manobra fisioterápica de vibração torácica manual

Pós-graduação em Engenharia Mecânica - FEG

Análise eletromiográfica e dinamométrica do tronco de jovens com e sem dor lombar crônica inespecífica

Pós-graduação em Desenvolvimento Humano e Tecnologias - IBRC

Estudo anatômico e imaginológico do braço e da coxa em tamanduá-bandeira (Myrmecophaga tridactyla - linnaeus, 1758) para a determinação de acesso cirúrgico

Pós-graduação em Medicina Veterinária - FMVZ

Efeito da colocação de um ponto simples em tendão flexor de coelho em região vascularizada e avascularizada: análise da propriedades mecânicas e histopatológicas

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Lesão do tendão flexor: sutura na região avascular ou vascularizada? Estudo biomecânico e histopatológico em coelhos

Pós-graduação em Bases Gerais da Cirurgia - FMB

Análise comparativa da atividade muscular do flexor superficial dos dedos e força de preensão palmar em atividades laborativas de uma indústria

Pós-graduação em Engenharia Mecânica - FEG

Differential Expression of Myogenic Regulatory Factor Genes in the Skeletal Muscles of Tambaqui Colossoma macropomum (Cuvier 1818) from Amazonian Black and Clear Water

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Decreased rate of protein synthesis, caspase-3 activity, and ubiquitin-proteasome proteolysis in soleus muscles from growing rats fed a low-protein, high-carbohydrate diet

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Verbal and visual stimulation effects on rectus femoris and biceps femoris muscles during isometric and concentric

Background: Coactivation may be both desirable (injury prevention) or undesirable (strength measurement). In this context, different styles of muscle strength stimulus have being investigated. In this study we evaluated the effects of verbal and visual stimulation on rectus femoris and biceps femoris muscles contraction during isometric and concentric. Methods: We investigated 13 men (age =23.1 ± 3.8 years old; body mass =75.6 ± 9.1 kg; height =1.8 ± 0.07 m). We used the isokinetic dynamometer BIODEX device and an electromyographic (EMG) system. We evaluated the maximum isometric and isokinetic knee extension and flexion at 60°/s. The following conditions were evaluated: without visual nor verbal command (control); verbal command; visual command and; verbal and visual command. In relation to the concentric contraction, the volunteers performed five reciprocal and continuous contractions at 60°/s. With respect to isometric contractions it was made three contractions of five seconds for flexion and extension in a period of one minute. Results: We found that the peak torque during isometric flexion was higher in the subjects in the VVC condition (p > 0.05). In relation to muscle coactivation, the subjects presented higher values at the control condition (p > 0.05). Conclusion: We suggest that this type of stimulus is effective for the lower limbs.

Interrelationships Between Bones, Muscles, and Performance: Biting in the Lizard Tupinambis merianae

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Test-retest reliability of electromyographic variables of masseter and temporal muscles in patients with cerebral palsy

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Hip muscles strength and activation in older fallers and non-fallers

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)