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A comparison of true and premodulated interferential currents.
John Ozcan1, Alex R Ward, Valma J Robertson
1School of Physiotherapy, La Trobe University, Victoria, Australia.
Archives of Physical Medicine and Rehabilitation
|March 20, 2004
Summary
Premodulated interferential currents (IFCs) showed no disadvantage compared to true IFCs, offering better torque and comfort. This challenges the claimed superiority of true IFCs in electrotherapy applications.
Area of Science:
- Rehabilitation science
- Biomedical engineering
- Physical therapy
Background:
- Interferential currents (IFCs) are widely used in physical therapy for pain relief and muscle stimulation.
- True IFCs are generated by crossing two medium-frequency currents, while premodulated IFCs are mixed prior to delivery.
- The clinical efficacy and optimal application methods for true versus premodulated IFCs remain subjects of investigation.
Purpose of the Study:
- To compare the effectiveness of true IFCs and premodulated IFCs.
- To evaluate differences in sensory, motor, and pain thresholds, maximum electrically induced torque (MEIT), and patient comfort.
- To assess the depth efficiency of stimulation using motor to sensory threshold ratios.
Main Methods:
- A repeated-measures laboratory study design was employed.
- Participants (university students and staff) were exposed to four conditions varying current modulation and path.
- Measurements included sensory, motor, and pain thresholds, MEIT, and subjective discomfort ratings.
Main Results:
- Premodulated IFCs, particularly with parallel current paths, produced higher torque values and less discomfort than constant-amplitude (true) IFCs.
- Crossed currents (true IFC) demonstrated no significant advantage over parallel currents (premodulated IFC) in motor-to-sensory threshold ratio, MEIT, or comfort.
- The findings contradict the purported superiority of true IFCs.
Conclusions:
- Premodulated IFCs, delivered with large electrodes, may offer superior clinical benefits over traditional true IFCs.
- These benefits include enhanced depth efficiency, greater torque production, and improved patient comfort.
- The study suggests premodulated IFCs could be a more effective electrotherapy option.