Hipotensão pós-exercício físico aeróbio em amputados traumáticos de membros inferiores

Abstract

INTRODUCTION: In patients with traumatic lower extremity amputations, the elevated cardiovascular mortality risk can be explained by the elevated blood pressure. However, in several diseases, physical exercise has been adopted as a non-pharmacological therapy to reduce blood pressure, since a single session of aerobic exercise can promote significant reduction in blood pressure, phenomenon called postexercise hypotension. Nevertheless, it is unknown if traumatic amputees presents after a single session of physical exercise, postexercise hypotension and if the occurrence of postexercise hypotension is accompanied by a reduction in peripheral vascular resistance. MATERIALS AND METHODS: Nine male subjects with traumatic lower extremity amputation participated in this study. The experimental protocol consisted of two sessions conducted in random order: one Control session (rest) and other of Physical Exercise (upper body cycle ergometer, 30 minutes, intensity equivalent to heart rate of the first ventilatory threshold). The clinic blood pressure (oscillometric method - DIXTAL® 2023), heart rate (Polar ® RS800CX), forearm blood flow and forearm vascular resistance (venous occlusion plethysmography - Hokanson®) , were measured before and after intervention in each session. Also, the ambulatory blood pressure and heart rate were measured for 24 hours after the sessions (CardioMapa®).The p<0,05 value was adopted as significant. RESULTS: Exercise induced a reduction in systolic, diastolic and mean arterial blood pressure values when compared to pre-exercise and Control session. The blood pressure reduction was accompanied by significant reduction of forearm vascular resistance, significant increase of forearm blood flow and heart rate when compared to pre-exercise values and Control session. In addition, exercise resulted in a significant reduction in 24-hour average for systolic, diastolic and mean arterial blood pressure; reduction in awake average for diastolic arterial blood pressure, reduction of asleep average for systolic, diastolic and mean arterial blood pressure and; maintenance of heart rate in 24-hours, awake and asleep average. CONCLUSION: Individuals with traumatic lower extremity amputation presents after a single session of aerobic exercise, clinic and ambulatory postexercise hypotension. Clinic postexercise hypotension was justified by a reduction in peripheral vascular resistance.