ABSTRACT
Dados clínicos: criança de 12 anos, sexo feminino, peso de 40Kg, altura de 150cm, assintomática, foi encaminhada ao Serviço de Ergometria para a realização de teste ergometrico, objetivando acompanhamento clínico. Eletrocardiograma: O traçado eletrocardiográfico em repouso, com a...
Subject(s)
Humans , Female , Child , Exercise Test/methods , ElectrocardiographyABSTRACT
As alterações eletrocardiográficas observadas no segmento ST compatíveis com isquemia miocárdica induzida pelo exercício, durante o teste ergométrico, apresentam maior acurácia diagnóstica e prognóstica quando correlacionadas com variáveis hemodinâmicas e outros parâmetros eletrocardiográficos.
Subject(s)
Humans , Female , Electrocardiography/methods , Myocardial Ischemia/diagnosis , Exercise TestABSTRACT
OBJECTIVE: To assess the influence of skeletal muscle mass on ventilatory and hemodynamic variables during exercise in patients with chronic heart failure (CHF). METHODS: Twenty-five male patients underwent maximum cardiopulmonary exercise testing on a treadmill with a ramp protocol and measurement of the skeletal muscle mass of their thighs by using magnetic resonance imaging. The clinically stable, noncachectic patients were assessed and compared with 14 healthy individuals (S) paired by age and body mass index, who underwent the same examinations. RESULTS: Similar values of skeletal muscle mass were found in both groups (CHF group: 3863 ± 874 g; S group: 3743 ± 540 g; p = 0.32). Significant correlations of oxygen consumption in the anaerobic threshold (CHF: r = 0.39; P= 0.02 and S: r = 0.14; P = 0.31) and of oxygen pulse also in the anaerobic threshold (CHF: r = 0.49; P = 0.01 and S: r =0.12; P = 0.36) were found only in the group of patients with chronic heart failure. CONCLUSION: The results obtained indicate that skeletal muscle mass may influence the capacity of patients with CHF to withstand submaximal effort, due to limitations in their physical condition, even maintaining a value similar to that of healthy individuals. This suggests qualitative changes in the musculature
Subject(s)
Humans , Male , Middle Aged , Body Mass Index , Cardiac Output, Low , Exercise , Exercise Test , Hemodynamics , Muscle, Skeletal , Pulmonary Ventilation , Anaerobic Threshold , Linear Models , Magnetic Resonance Spectroscopy , Muscle, Skeletal , ThighABSTRACT
OBJETIVE: The evaluation, by exercise stress testing, of the cardiorespiratory effects of pyridostigmine (PYR), a reversible acetylcholinesterase inhibitor. METHODS: A double-blind, randomized, cross-over, placebo-controlled comparison of hemodynamic and ventilation variables of 10 healthy subjects who underwent three exercise stress tests (the first for adaptation and determination of tolerance to exercise, the other two after administration of placebo or 45mg of PYR). RESULTS: Heart rate at rest was: 68 + or - 3 vs 68 + or - 3bpm before and after placebo, respectively (P=0.38); 70 + or - 2 vs 59 + or - 2bpm, before and after pyridostigmine, respectively (P<0.01). During exercise, relative to placebo: a significantly lower heart rate after PYR at, respectively, 20 per cent (P=0.02), 40 per cent (P=0.03), 80 per cent (P=0.05) and 100 per cent (P=0.02) of peak effort was observed. No significant differences were observed in arterial blood pressure, oxygen consumption at submaximal and maximal effort, exercise duration, respiratory ratio, CO2 production, ventilation threshold, minute ventilation, and oxygen pulse. CONCLUSION: Pyridostigmine, at a dose of 45mg, decreases heart rate at rest and during exercise, with minimal side effects and without interfering with exercise tolerance and ventilation variables.
Subject(s)
Humans , Male , Female , Adult , Cholinesterase Inhibitors/pharmacology , Exercise Test/drug effects , Pyridostigmine Bromide/pharmacology , Double-Blind Method , Heart Rate/drug effects , Oxygen Consumption/drug effectsSubject(s)
Humans , Altitude Sickness/epidemiology , Altitude Sickness/physiopathology , Exercise , MorbiditySubject(s)
Humans , Adolescent , Middle Aged , Heart Diseases/complications , Death, Sudden, Cardiac , Exercise Test , Follow-Up Studies , SportsABSTRACT
O condicionamento fisico de adolescentes pode ser obtido atraves de um programa de exercicios aerobicos, melhor tolerados pela utilizacao predominante da energia oxidativa, ao contrario das atividades anaerobicas que levam a um nivel elevado de acido latico, pouco tolerado pelo adolescente, com exaustao muitas vezes precoce. O condicionamento fisico e de grande utilidade em adolescentes hipertensos, obesos, diabeticos, e, contribui para elevacao de hormonios do crescimento. Deve-se pesquisar a presenca de anemia, incompativel com a boa performance. Para a avaliacao cardiorespiratoria de adolescentes que vao iniciar a pratica esportiva torna-se indispensavel a execucao de teste ergometrico em esteira rolante, em que se realiza o eletrocardiograma de esforco. Ecocardiograma tambem tem uma indicacao importante na deteccao de anomalias valvares ou miocardicas, e, em casos especiais, se indica o ecocardiograma com esforco, realizado em bicicleta ergometrica. Os parametros obtidos nestes exames permitem a liberacao do individuo para os programas de condicionamento fisico e colaboram na quantificacao destes programas. A atividade esportiva em adolescentes tem uma grande importancia no desenvolvimento fisico e psiquico, devendo ser mais estimulada nas escolas e nas comunidades