No abstract

Purpose -Heart rate variability (HRV) has been studied at rest as a non-invasive tool for the assessment of cardiac autonomic control and, its attenuation is related to cardiovascular risk. However, during exercise, when important neural changes take place, HRV behaviour is not well established. The aim of this investigation was to study the heart rate (HR) and HRV responses during the different metabolic phases of maximal graded exercise in young men.Methods -Seventeen men (age 28±6 years) were submitted to a graded cardiopulmonary exercise test in a cycloergometer (30W/3min). To study HR and HRV (standard-deviation) Métodos -Dezessete homens (28±6 anos) realizaram teste ergoespirométrico máximo em cicloergômetro (30W/ 3min), determinando-se a FC e a VFC (desvio-padrão) através da onda eletrocardiográfica, amplificada e gravada batimento a batimento em computador, numa freqüên-cia da 125Hz (AT/Codas).Resultados [1][2][3][4] . Estudos recentes 5-8 têm demonstrado que a diminuição da VFC está relacionada a um maior índice de morbidade e mortalidade cardiovascular. Por essas razões, muitos autores têm se ocupado em utilizar manobras respiratórias 9 , mudanças de posição 10,11 e bloqueios farmacológicos do sistemas nervosos simpático e parassimpático 10 , na tentativa de investigar a VFC.

Purpose -To compare the lower (LL) and upper limits (UL) of exercise intensity prescription based on standard exercise test (60-70% of estimated VO 2 max or 70-85% of HRmax measured) with exercise intensity prescription based on cardiopulmonary exercise test [anaerobic threshold (AT) and respiratory compensation point (RCP)].Methods AT (4mph= 34.4±4.5 vs 19.6±4.6 and 5mph= 28.9±2 vs 18.9±5.4, and LPC= 32.0±4.1 vs 17.2±2.8 and MPC= 31.6±4.9 LA (4mph= 34,4±4,5 vs 19,6±4,6 e 5mph= 28,9±2 vs 18,9±5,4, e BCF= 32,0±4,1 vs 17,2±2,8 e MCF= 31,6±4,9 vs 21,1±5,9±7,8 vs 113,1± 15,6 e 5mph= 130,3±5,2 vs 114,1± 18,9, e BCF= 127,6±7,2 vs 109,3±13,2 e MCF= 131,2± 5,7 vs 117,4± 19,2bpm Embora pareçam existir poucas dúvidas quanto a melhora na qualidade de vida e, sobretudo, na condição de saúde alcançada através de um programa de condicionamento físico, esses benefícios dependem de uma prescrição Métodos -Realizaram teste ergoespirométrico progressivo até a exaustão 47 homens (30±5 anos), divididos em subgrupos, de acordo com a velocidade da esteira durante o teste (4 ou 5mph) e a capacidade física medida [baixa (BCF) e moderada (MCF)]. Resultados -Os L.inf. de prescrição indireta apresentaram valores de VO 2 e FC significantemente maiores que os valores de VO 2 e FC no

Growth and motor development of Muzambinho children and adolescents: a research project with academic, social and of inter-institutional political implications This paper presents a broad overview of a mixed-longitudinal study about growth and motor development of children, adolescents and their families from Muzambinho, Brazil. This study is multicenter, linking researchers from Brazil, Mozambique and Portugal aiming at the multifocal investigation about the dynamics of growth and development. It aims also at the interpretation of multiple interactions of a broad array of variables, as well as the varied facets of intraindividual change and interindividual differences. The implications and challenges are highlighted using a multidisciplinary and multicenter approach in Portuguese speaking countries. The study is devised in two phases with semester data collections: the first part sampled 470 subjects from 7 to 12 years divided in 4 cohorts; the second phase included 634 subjects from 6 to 14 years divided in 5 cohorts (linked to the structure of the first phase). We included also 200 nuclear families. We present some of the main research themes for each phase, their academic, social and inter-institutional implications.