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The Use of i/t Curve in Assessment of Effects of Biceps Brachii Phototherapy With PILER Light
In Brief
A clinical study evaluating Irradiations of the biceps brachii muscle with PILER light. The participants were randomized into 4 groups: group v - no filter/ group x - red filter/ group y - blue filter/ group z - placebo. for Nerve Disorders. Completed, enrolled 60 participants.
Detailed Summary
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).
Study Details
Timeline
Interventions
Biceps brachii examination was carried out before (examination 1) and after (examination 2) a series of 10 PILER light treatments. It included a traditional electrodiagnostic examination and the assessment of the pressure pain threshold (PPT). The electrodiagnostic examination of the muscle was performed using the unipolar stimulation method from the direct motor point. The passive electrode (6 cm x 6 cm) was attached to the side of the distal part of the forearm, and the distal edge of the electrode was adjacent to the proximal edge of the ulnar styloid process. The examination was performed with a Multitronic MT3 electrotherapy apparatus set. PPT at the direct motor point was determined using an algometer (Algometer commander TM ITECH Medical Industries). A head with a rubber jacket with a surface area of 0.5 cm2 was used to cause pressure pain. Pressure was exerted until the participant reported pain, at which time the force (lbs) marked by the algometer was recorded.