Interrelationships between body fat and skin blood flow and the current required for electrical stimulation of human muscle
| Autor: | Jennifer Batt, Hye Jin Suh, Shashi Gunda, Jerrold S. Petrofsky, Michelle Prowse |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Adult
Male Contraction (grammar) Biomedical Engineering Biophysics Stimulation Electric Stimulation Therapy Electromyography Biceps Body Mass Index Membrane Potentials Human muscle medicine Humans Muscle Strength Electrodes Skin medicine.diagnostic_test Skin blood flow business.industry Muscles Blood flow Anatomy Adipose Tissue Body Composition Female medicine.symptom business Blood Flow Velocity Muscle contraction Muscle Contraction |
| Zdroj: | Medical engineeringphysics. 30(7) |
| ISSN: | 1350-4533 |
| Popis: | There is variability between individuals in the current needed to elicit a contraction in human muscle with surface electrodes. To understand what might be causing some of this variability, 25 subjects whose average age was 24.4+/-2.3 years, whose height was 165.5+/-9.5 cm, and whose average weight was 70.3+/-21 kg were examined. Electrical stimulation was applied above the motor point of the quadriceps, biceps, and lateral gastrocnemius muscles. To assess body fat, 2D ultrasound was used with a 1cm stand off. Electrical stimulation was applied with sine wave stimulation at 100 micros pulse width and at a frequency of 30 Hz. To alter skin blood flow, aside from the natural difference in skin blood flow at rest, hot packs and cold packs were used for 5 min. The average fat thickness below the quadriceps and gastrocnemius muscles was 0.75+/-0.13 cm and under the biceps was 0.48+/-0.16 cm. Without the use of hot or cold packs, the currents for the quadriceps and gastrocnemius muscles were significantly higher than that of the biceps (p |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect