High-voltage pulsed galvanic stimulation: effects of frequency of current on blood flow in the human calf muscle
| Autor: | Susan Bleck Gibbs, Martha E. Heath |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Adult
Male medicine.medical_specialty Time Factors Blood Pressure Electric Stimulation Therapy Isometric exercise Positive correlation Calf muscles Heart Rate Internal medicine medicine Humans Leg Chemistry Muscles Healthy subjects General Medicine Blood flow Anatomy Calf muscle Circulatory system Galvanic stimulation Cardiology Female Blood Flow Velocity Muscle Contraction |
| Zdroj: | Clinical Science. 82:607-613 |
| ISSN: | 1470-8736 0143-5221 |
| DOI: | 10.1042/cs0820607 |
| Popis: | 1. Twelve healthy subjects received high-voltage pulsed galvanic stimulation (115–475V d.c.) delivered in separate treatments of 2, 32 and 128 pulses/s for 10 min at the subject's maximum tolerable voltage while calf muscle blood flow was measured by non-invasive Whitney strain-gauge venous occlusion plethysmography. 2. The high-voltage pulsed galvanic stimulation was administered with negative polarity by an intermittent mode of 30 s on, 30 s off. Measurements of calf muscle blood flow were made during each 30 s period when the stimulus was off. The effect of one 30 s maximum isometric contraction of the calf muscles on blood flow was used as a standard for evaluating the effectiveness of high-voltage pulsed galvanic stimulation on calf muscle blood flow. 3. Significant (paired t-tests; P < 0.05) increases in calf muscle blood flow over the preceding baseline levels occurred for the isometric contraction (322%) and for frequencies of 2 pulses/s (33.5%) and 128 pulses/s (13.36%), but not for a frequency of 32 pulses at which calf muscle blood flow increased in only six of 12 subjects. The mean increases in calf muscle blood flow at 2 and 128 pulses/s represented 11.63% and 4.0%, respectively, of that resulting from the isometric contraction. 4. A clear positive correlation between voltage level and the magnitude of increase in calf muscle blood flow was demonstrated but differed for each frequency used. 5. It is concluded that high-voltage pulsed galvanic stimulation results in a measurable increase in calf muscle blood flow when it is applied at frequencies of 2 or 128 pulses/s on intermittent mode and at maximum tolerable voltages, but the magnitude of the increase in blood flow is small compared with that stimulated by a maximal isometric contraction. |
| Databáze: | OpenAIRE |
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