Healthy Volunteers Clinical Trial
Official title:
Effects of Transcutaneous Nervous Electric Stimulation (TENS) and Interferential Electrical Stimulation (IES) on the Autonomous Balance of Normotens Volunteers and Hypertensive Patients
Hypertension is considered a serious public health problem. The imbalance in autonomic nervous system (ANS) activity is one of the main triggers in the development and maintenance of hypertension. The non-pharmacological management of this disease is an important resource, especially in refractory hypertensive patients or in hypertensive crises, where the pharmacological treatment does not present an efficient response. It is known that transcutaneous electrical nerve stimulation (TENS) is capable of modifying the autonomic balance, however, the effects of Interferential electrical stimulation (IES) on this system in normotensive and hypertensive volunteers are not yet known. These electrotherapeutic resources may be a non-pharmacological tool supporting the management of hypertension. The objective of this research is to study the effects of different TENS and IC parameters on cardiovascular variables of normotensive volunteers and hypertensive patients.
Each volunteer will perform three assessments with a one-week interval. Each assessment will include assessment of autonomic balance, blood pressure, and blood collection (catecholamines). Interventions (placebo, low frequency TENS and IES) will be randomized. Volunteers will be accommodated in the supine position. With properly sanitized skin (70% alcohol) and self-adhesive electrodes (5x5 area) will be positioned in the cervical paravertebral region. All participants will be submitted to a placebo TENS session, a low frequency TENS session (TENS, 10 Hz/200μs) and an IES session (STEIN et al., 2012). The sessions will take place in the morning in a 12-hour fast, lasting 30 minutes, in an air-conditioned place (23ºC). ;
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