RESUMO
In isometric efforts small energy expenditure was found to involve an inadequate increase of the heart rate and blood pressure. In dynamic cyclic loads, the heart rate and blood pressure increase occurs linearly, corresponding to the increase of O2 consumption and systolic index. Voluntary relaxation of muscles in the course of cyclic load involves small values of the O2 consumption and systolic index, as well as low heart rate and blood pressure. In natural cyclic and noncyclic motor activity, the character of integration of the motor and vegetative functions depends on the relative weight of each of the biomechanical modes.
Assuntos
Sistema Nervoso Autônomo/fisiologia , Atividade Motora/fisiologia , Músculos/fisiologia , Esforço Físico , Adolescente , Adulto , Frequência Cardíaca , Hemodinâmica , Humanos , Contração Isométrica , Masculino , Consumo de Oxigênio , RespiraçãoAssuntos
Hemodinâmica , Respiração , Fenômenos Biomecânicos , Volume Sanguíneo , Humanos , Movimento , Contração Muscular , Relaxamento Muscular , Esforço FísicoRESUMO
Respiratory responses to different movements and postures become stabilized according to the respiratory-energy demands of the optimal way for task solution. Passive pedalling entails diminishing of electrical activity, the respiratory reactions at that being significantly higher than at resting but lower as compared to active work. With no circumstantial (sporting) stimuli, the increase of respiratory responses to muscular relaxation in the course of pedalling was as significant as the cardiac outflow volume. Maximal and minimal values of the blood pressure did not change. The circumstantial conditioned stimuli enhanced the respiratory responces both at resting and during passive pedalling.
