Interferential electrical stimulation (IES) increases local blood flow. It is not known whether increases in blood flow may be caused by inhibition of sympathetic activity, mediated by muscle metaboreflex activity. The purpose of this study was to evaluate the effect of IES on metaboreflex activation in healthy subjects.
The study sample consisted of 11 healthy young individuals. All subjects were non-smokers, non-obese and free of any signs or symptoms of disease, as revealed by medical history, physical examination and electrocardiogram at rest and during cardiopulmonary exercise testing. Exclusion criteria were pregnancy, breast-feeding, alcohol or drug abuse, and any medication with potential effects on cardiovascular variables. Subjects were asked not to drink caffeine-containing drinks or exercise for at least 12 and 48 hours, respectively, before the experimental protocols.
Study Type
OBSERVATIONAL
Enrollment
11
The individuals are treated acutely with IES during 30 min, providing a continuous flow of symmetrical rectangular interferential current biphasic pulses using bipolar electrodes with two channels and a slope of 1/5/1. The fixed current is adjusted to 4000 Hz, with the current AMF at 100 Hz and an AMF variation of 25 Hz (25% of AMF).
The same instructions and electrode positions were provided to the placebo, although the equipment did not provide any stimulation current
University of Brasilia
Brasília, Federal District, Brazil
Hospital de Clinicas de Porto Alegre
Porto Alegre, Rio Grande do Sul, Brazil
Gaspar Rogério da Silva Chiappa
Porto Alegre, Rio Grande do Sul, Brazil
Muscle Metaboreflex Reflex
Calf blood flow
Time frame: Participants will be followed for the duration of metaboreflex activity (up to 30 minutes)
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