Journal
ARTIFICIAL ORGANS
Volume 34, Issue 2, Pages 126-135Publisher
WILEY
DOI: 10.1111/j.1525-1594.2009.00759.x
Keywords
Stimulus parameters; Neuromuscular; Electrical stimulation; Gastrocnemius muscle; Muscle force; Human
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The article presents the results of investigations on the influence of biphasic stimulus parameters such as duration and stimulus interphase interval (IPI) on a gastrocnemius muscle contraction force. Seven healthy volunteers participated in this experiment, and 24 different stimuli patterns were tested. Special attention was paid to the comfort level of a sensory perception while the electrostimulation was applied. During the test, an optimal stimulus pattern evoking contraction at the level over 15% maximum voluntary contraction force and preserving a good comfort perception reported by all of the participants was investigated. It was found that bursts of pulses with width 175 mu s and the IPI from 50 to 1000 mu s satisfied these criteria. Moreover, it was observed that the increase of the IPI duration generated a significantly stronger contraction force in comparison with the stimulation with the standard biphasic pulses (IPI = 0 mu s) having the same amplitude, frequency, and pulse duration. This shows that the modulation of the IPI might be a potentially useful support for the standard force-control methods and may find an application in neuromuscular electrical stimulation systems.
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