Do men and women use similar adaptive locomotion to clear static and dynamic obstacles?

Purpose. The purpose of this study was to analyze the influence of gender on the adaptive locomotion in the clearance of obstacles. Specifically, it was evaluated if there are differences in the space-temporal parameters between male and female in the clearance of and dynamic obstacles moving at both slow and fast speeds. Basic procedures. Five young male adults and five young female adults took part in this study. The task was performed in three conditions: static obstacle and dynamic obstacle - clearance perpendicular to the participant's trajectory at slow speed (1.07 m/s) and at fast speed (1.71 m/s). The trials were recorded by two digital cameras and spatial-temporal information was obtained. Main findings. The dynamic obstacle conditions required more visual inspection. The results showed different adaptive locomotion between the sexes. The distinct gait patterns were evidenced for the spatial and temporal variables and cadence in the three conditions. Conclusions. The women presented a more conservative behavior, which was evidenced by the increase of the length in the penultimate step and in the toe clearance.

Effects of fatigue induced by prolonged gait when walking on the elderly

Purpose. Fatigue has been pointed as a fall risk in the elderly; however, the effects of prolonged gait on neuromuscular recruitment and on its pattern remain unknown. The aim of this study was to evaluate the effects of prolonged gait on neuromuscular recruitment levels and spatial-temporal gait variables. Methods. Eight healthy older women (age: 72.63 ± 6.55 years) walked at their preferred walking speed for twenty minutes on a treadmill. The Root Mean Square (RMS) from the vastus-lateralis, femoral biceps, tibialis anterior and lateral gastrocnemius muscles were determined at the first and last minute of the test during the moments of Heel Strike (HS), Terminal Stance and Terminal Swing (TS). In addition, coactivation in the knee and ankle as well as the stride cadence and length were measured in the test. The two RMS data (taken at the first and last minute) were compared by means of a Student's t-test. Results. Twenty minutes of walking induced fatigue in the subjects, as observed through an increase in RMS, notably during the HS and TS. Coactivation was also influenced by the prolonged gait test. The only gait phase where a risk of falling was enhanced was the HS. Nonetheless, subjects developed strategies to maintain a safe motor pattern, which was evidenced by an increase in stride length and a decrease in stride cadence. Conclusion. Tests lasting just twenty minutes on a treadmill were enough to induce fatigue in older adults. However, the level of fatigue was not enough to present a danger or fall risk to elderly individuals.

Maximal isokinetic peak torque and EMG activity determined by shorter ranges of motion

Purpose. Isokinetic tests are often applied to assess muscular strength and EMG activity, however the specific ranges of motion used in testing (fully flexed or extended positions) might be constrictive and/or be painful for patients with injuries or under-going rehabilitation. The aim of this study was to examine the effects of different ranges of motion (RoM) when determining maximal EMG during isokinetic knee flexion and extension with different types of contractions and velocities. Methods. Eighteen males had EMG activity recorded on the vastus lateralis, vastus medialis, semitendinosus and biceps femoris muscles during five maximal isokinetic concentric and eccentric contractions for the knee flexors and extensors at 60° • s -1 and 180° • s -1. The root mean square of EMG was calculated at three different ranges of motion: (1) a full range of motion (90°-20° [0° = full knee extension]); (2) a range of motion of 20° (between 60°-80° and 40°-60° for knee extension and flexion, respectively) and (3) at a 10° interval around the angle where peak torque is produced. EMG measurements were statistically analyzed (ANOVA) to test for the range of motion, contraction velocity and contraction speed effects. Coefficients of variation and Pearson's correlation coefficients were also calculated among the ranges of motion. Results. Predominantly similar (p > 0.05) and well-correlated EMG results (r > 0.7, p ≤ 0.001) were found among the ranges of motion. However, a lower coefficient of variation was found for the full range of motion, while the 10° interval around peak torque at 180° • s -1 had the highest coefficient, regardless of the type of contraction. Conclusions. Shorter ranges of motion at around the peak torque angle provides a reliable indicator when recording EMG activity during maximal isokinetic parameters. It may provide a safer alternative when testing patients with injuries or undergoing rehabilitation.

Effects of elbow flexor muscle resistance training on strength, endurance and perceived exertion

Purpose. To verify the effects of resistance training at the electromyographic fatigue threshold (EMGFT) based on one-repetition maximum strength (1RM), heart rate (HR), rate of perceived exertion (PE) and endurance time (EndT). Methods. Nineteen subjects (training group [TG]: n = 10; control group [CG]: n = 9), performed 1-min bicep curl exercises sets at 25%, 30%, 35% and 40% 1RM. Electromyography (biceps brachii and brachiorradialis), HR and PE were registered. Biceps brachii EMGFT was used to create a load index for an eight-week resistance training programme (three sets until exhaustion/session, two sessions/week) for the TG. The CG only attended one session in the first week and another session in the last week of the eight-week training period for EndT measurement. EndT was determined from the number of repetitions of each of the three sets performed in the first and last training sessions. After training, 1RM, EMGFT, EndT, HR and PE at the different bicep curl load intensities were again measured for both groups. Results. Increases in 1RM (5.9%, p < 0.05) and EndT (> 60%, p < 0.001) after training were found. In addition, PE was reduced at all load intensities (p < 0.05), while no changes were found for HR and EMGFT after training. Conclusions. Strength-endurance training based on the EMGFT improved muscular endurance and also, to a lesser extent, muscular strength. Moreover, the reduced levels of physical exertion after training at the same intensity suggest that endurance training exercises may improve comfort while performing strength exercises.

Padrão de coordenação do pular corda: um estudo desenvolvimental

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Avaliação da força aplicada à articulação do ombro em cadeirantes durante a manobra de transferência

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

O xadrez nos contextos do lazer, da escola e profissional: aspectos psicológicos e didáticos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Caminho da fé: pedestrianismo, estados emocionais e reflexões sobre a ambiência

Pós-graduação em Ciências da Motricidade - IBRC

O papel da ginástica terapêutica chinesa Lian Gong em 18 terapias no comportamento psicomotor e cotidiano de praticantes adultos

Pós-graduação em Ciências da Motricidade - IBRC

Estudo de acidentes com motocicletas no município de Presidente Prudente no ano de 2003

Pós-graduação em Saúde Coletiva - FMB

Rotações tridimensionais em biomecânica via quatérnions: aplicações na análise dos movimentos esportivos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Faces da pós-graduação stricto sensu em Educação Física no Brasil

A pesquisa tem como objetivo central investigar as propostas de formação do professor/pesquisador em Educação Física nos diferentes Programas de Pós- Graduações em Educação Física no Brasil: 1. Programa de Pós-Graduação em Ciências da Atividade Física da Universidade Salgado Filho - PGCAF/UNIVERSO; 2. Programa de Pós-Graduação em Ciências do Esporte da Universidade Federal de Minas Gerais - PPCE/UFMG: 3. Programa de Pós-Graduação em Ciências do Movimento Humano da Universidade Federal do Rio Grande do Sul - PPGMH/UFRGS; 4. Programa de Pós-Graduação em Motricidade Humana da Universidade Paulista - PPGCM/UNESP: 5. Programa de Pós-Graduação em Educação Física da Universidade de São Paulo PPGEF/USP. Pesquisa documental e bibliográfica teve como bases para investigação arquivos oferecidos pela CAPES acerca da classificação e denominações dos programas assim como o projeto pedagógico de cada instituição, conteúdo das revistas e sites dos programas e a bibliografia referente ao assunto. A pesquisa se insere dentro do paradigma de pesquisa critica assentada no materialismo histórico dialético, como mote cientifico, reflexão filosófica e posicionamento político. Com o resultado identificamos que as diferentes concepções de programas na área, variam de propostas que abrangem um amplo campo de pesquisas e atuação à aquelas que restringem o campo, variantes que remontam as inúmeras propostas de Educação física surgidas nas décadas de 1970 e 1980.

Interactions of age and leg muscle fatigue on unobstructed walking and obstacle crossing

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Temporal and Spatial Scaling of the Genetic Structure of a Vector-Borne Plant Pathogen

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Fundamentos filosóficos e antropológicos da teoria do se-movimentar e a formação de sujeitos emancipados, autônomos e críticos: o exemplo do currículo de educação física do Estado de São Paulo

This article examines philosophical and anthropological underpinnings of the Sich-Bewegen Theory, based on the phenomenological philosophy by Merleau-Ponty and social anthropology by Mauss and Geertz. It also considers implications for Physical Education Elementary and High School curricula aimed at forming emancipated, autonomous and critical individuals, taking the Physical Education Curriculum of the State of Sao Paulo as example. It concludes that the curriculum needs to imbricate into students'social life and take into account the challenges and issues from contemporary society.