Nerve Disorders Clinical Trial
Official title:
The Use of i/t Curve in Assessment of Effects of Biceps Brachii Phototherapy With PILER Light
Conventional electrodiagnostic examination is useful in daily physiotherapeutic practice.
Nevertheless, the subjective assessment of muscle contraction and perceived current
vibrations carries the risk of error and thus is a limitation of the method. Therefore, the
use of the I/T curve coefficient was proposed in this study. This coefficient is the
arithmetic mean of the electrical charge needed to trigger a sensory or motor reaction at
different widths of the electrical pulse. PILER (Polychromatic Incoherent Low-Energy
Radiation) light affects the sensory and motor excitability of the tissue. The resulting
changes may depend on the colour of the filter used in the irradiations.
The study aimed to:
1. To evaluate changes in neuromuscular excitability occurring after PILER irradiation
using filters of different colours.
2. To evaluate the usefulness of the I/T curve coefficient in neuromuscular excitation
test.
60 healthy volunteers were assigned to one of four groups irradiated with: 1 - Piler light +
red filter, 2 - Piler light + blue filter, 3 - Piler light without a filter, 4 - placebo.
Main Outcome Measures were plotting I/T curve coefficient for rectangular (■I/T coeff) and
triangular (▲I/T coeff) pulses and the pressure pain threshold (PPT).
Electrodiagnostic examination is a valuable addition to clinical trials and is useful in
disorders of neuromuscular excitability.
The I/T curve is a non-invasive electrodiagnostic method for the quantitative assessment of
neuromuscular excitation. Plotting it makes it possible to determine the rheobase (minimum
stimulus amplitude to reach the stimulation threshold with a long pulse duration /1000 ms/)
and chronaxie (minimum duration of a stimulus with an amplitude twice that of the rheobase
needed to reach the stimulation threshold.
Traditional electrodiagnostic examination is popular among clinicians due to its
availability, ease of administration and usefulness in physiotherapeutic practice. The
subjective assessment of muscle contraction and perceived current vibrations carries the risk
of error and thus is a limitation of the method. Therefore, use of the I/T curve coefficient
was proposed in this study. This coefficient is the arithmetic mean of the electrical charge
needed to trigger a sensory or motor reaction at different widths of the electrical pulse.
Polarized polychromatic incoherent low-energy radiation (PILER light) can affect the sensory
and motor excitability of living tissue. The biological activity of light results from the
energy of its ordered electromagnetic waves acting on living cells. No thermal effect is
present, as the density of the energy transmitted to the tissues is low.PILER therapy often
uses filters of different colours, each showing a slightly different effect on excitable
tissue.
The research questions of this randomised experiment were:
1. Does PILER light affect sensory and motor excitation?
2. Does the electromagnetic wavelength of PILER light influence its effect?
3. Is the I/T curve coefficient a useful measure of sensory and motor excitation?
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