Instrução verbal: solicitar foco de atenção não garante sua adoção e melhor desempenho

The purposes of this study were to investigate a) the effect of redundant and non-redundant instruction on external focus of attention adoption, b) the effect of adopting an external focus of attention on performance in a front crawl swimming task, and c) the effect of redundancy in the wording of a verbal instruction on the above variables. 43 college students (m/f) aged 17 to 46 swam 25 m crawl at maximum speed, once under each of three conditions: without focus instruction (SF), following a focus instruction (CF) and a redundant focus instruction (CFR), in counterbalanced order. For focus adoption control, after completing the task participants were asked about what they had focused on while swimming. As a measure of performance, time and number of strokes were taken and the stroke index was calculated. The results showed that under redundant focus instruction (CFR) condition, 42 % failed to adopt the attentional focus as asked, and following focus (CF) instruction, 23 %. Under CF condition, the frequency of participants that adopted the focus was higher than of those who did not. Performance did not differ significantly among the three conditions (p>0,05). These findings stress the need of manipulation checks in attentional focus research, regarding both performance and motor learning efficiency, as well as the need for further investigation into the relation between instruction extension and performance.

Avaliação da concordância na aplicação da Escala de Braden interobservadores

OBJETIVOS: Verificar a prevalência de úlcera por pressão nas unidades de internação de pacientes adultos do Hospital Universitário da Universidade de São Paulo (HU-USP) e verificar a concordância entre observadores na avaliação de risco, por meio da Escala de Braden. MÉTODOS: Estudo exploratório, quantitativo. Os dados foram coletados por seis colaboradoras treinadas que realizaram exame físico e avaliação de risco em 87 pacientes, avaliação esta considerada "padrão ouro". Os dados das avaliações feitas pelas enfermeiras, nos mesmos pacientes, foram coletados dos prontuários. RESULTADOS: verificou-se prevalência de 19,5% no hospital e 63,6% na Unidade de Terapia Intensiva, 15,6% na Clínica Cirúrgica, 13,9% na Clínica Médica e 0% na Semi-Intensiva. Quanto à concordância entre os observadores na avaliação clínica dos pacientes, a percepção sensorial, atividade, mobilidade e fricção/cisalhamento apresentaram fortíssima concordância. Umidade e nutrição, baixa concordância, sugerindo que esses subescores deverão ser discutidos para verificar as causas da controvérsia. CONCLUSÃO: Estudos de prevalência de úlcera por pressão possibilitam verificar a extensão do problema e fornecem subsídios para construção de estratégias e programas de prevenção.

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

Abstract 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.