Motor readiness and joint torque production in lower limbs of older women fallers and non-fallers

This study aimed to evaluate the motor response time and ability to develop joint torque at the knee and ankle in older women with and without a history of falls, in addition to investigating the effect of aging on these capacities. We assessed 18 young females, 21 older female fallers and 22 older female non-fallers. The peak torque, rate of torque development, rate of electromyography (EMG) rise, reaction time, premotor time and motor time were obtained through a dynamometric assessment and simultaneous electromyography. Surface EMGs of the rectus femoris (RF), vastus lateralis (VL), biceps femoris (BF), gastrocnemius lateralis (GL) and tibialis anterior (TA) muscles were recorded. Knee extension and flexion peak torques were lower in older fallers than in non-fallers. Knee extension and flexion and ankle plantarflexion and dorsiflexion peak torques were lower in both older groups than in the younger group. The rate of EMG rise of the BF and the motor time of the TA were lower and higher, respectively, in older fallers than in the younger adults. The time to reach peak torque in knee extension/flexion and ankle plantarflexion/dorsiflexion and the motor times of the RF, VL, BF and GL were higher in both older groups than in the younger groups. The motor time of the TA during ankle dorsiflexion and the knee extension peak torque were the major predictors of falls in older women, accounting for approximately 28% of the number of falls. Thus, these results further reveal the biomechanical parameters that affect the risk of falls and provide initial findings to support the prescription of exercises in fall prevention programs. © 2013 Elsevier Ltd.

El transporte eléctrico urbano en América Latina: una breve reseña de su pasado, presente y perspectivas

Incluye Bibliografía

Política y estructura tarifaria en el sector eléctrico

Incluye Bibliografía

Informe provisional de la Reunión de Expertos sobre Bases para la Estructura Tarifaria en el Sector Eléctrico en América Latina

Incluye Bibliografía

Modelagem de um motor de indução trifásico operando com tensões desequilibradas por meio de redes neurais artificiais

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Efeitos do treinamento físico sobre o nível de atividade física, capacidade funcional e comprometimento motor na doença de parkinson

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Uso da esteira motorizada na promoção do desenvolvimento motor de bebês com risco de atraso desenvolvimental

Pós-graduação em Ciências da Motricidade - IBRC

Algunos problemas en el financiamiento de la expansión del sector eléctrico

Documento presentado por la Comisión Económica para América Latina, Programa de Energía y Recursos Hidráulicos

Evolución y perspectivas del sector eléctrico en el Istmo Centroamericano: informe preliminar

Incluye Bibliografía

Avances y perspectivas del programa de actividades regionales en el subsector eléctrico del Istmo Centroamericano

Resena las actividades a partir de la 4. Reunion del Subcomite; las tareas relacionadas con el Programa de Actividades Regionales en el Subsector Electrico (PARSEICA); los avances efectuados en el ambito de la planificacion y en la operacion de sistemas electricos del Istmo Centroamericano; y los trabajos a desarrollar en 1987.

Proyecto de código eléctrico regional: capítulos III y IX

Incluye Bibliografía

Proyecto de código eléctrico regional

Incluye Bibliografía