Respostas da frequencia cardiaca e da pressão arterial sistemica as manobras postural passiva e de valsalva, em individuos sedentarios e atletas corredores de longa distancia / Heart rate and blood pressure responses to head-up tilting and valsalva maneuver in long distance runners and sedentary subjects

AUTOR(ES)
DATA DE PUBLICAÇÃO

1997

RESUMO

This research aimed to study the heart rate (HR) and blood pressure (BP) responses to head-up tilting (HUT) and Valsalva maneuver (VM), analyzing the autonomic nervous system control of these variables, in long distance runners and sedentary subjects. The study inc1udeda group of sedentary subjects (S) who did not practice any regular physical activity for at least one year, and a group of athletes (A), long distance runners, who were involved in this modality for at least 4 years. The evaluation of the aerobic capacity and the autonomic cardiovascular adaptations, induced by endurance training, were undertaken using noninvasive functional tests: dynamic exercise, VM and HUT. The physiological variables studied were: resting heart rate (RHR), heart rate at anaerobic threshold (ATHR), oxygen uptake at anaerobic threshold ( VO IND.2 AT) and exercise peak ( VO IND. 2 peak),work load (WL) at anaerobic threshold (WLAT) and exercise peak (WLpeak), HR during VM and HUT and systolic (SBP) and diastolic (DBP) blood pressure during the HUT test. The RHR values were lower for the A group (p<0,05). The VO IND. 2 AT, VO IND.2 peak,WLAT and WLpeak were higher for the A group (p<0,05)compared to the values of the S group, showing the high aerobic capacity of the athletes. The HR responses, as a function of the time, during the VM at supine and tilting position were similar in both studied groups. However, the HR response during VM at supine position was lower than the HR response during tilting position in both groups (without statistical significance). The HR values and their response velocities during the first minute of tilting were lower in the A group (without statistical differences). However, during the recovery of the HUT (supine position), the HR values and their response velocities were lower in the athletes(p<0,05). The SBP responses during HUT were similar to both groups but the DBP responses were higher in the athletes. The results of this study has shown that the endurance physical training practiced by the athletes induced cardiovascular adaptations mainly related to lower values of HR at rest and during VM and HUT

ASSUNTO(S)

sistema cardiovascular fisiologia humana sistema nervoso autonomo educação fisica adaptação

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