Hardyck and his researchers were the first (1966) practitioners to use sEMG. In the early 1980s,Cram and Steger introduced a clinical method for scanning a variety of muscles using an EMG sensing device.
It was not until the middle of the 1980s that integration techniques in electrodes had sufficiently advanced to allow batch production of the required small and lightweight instrumentation and amplifiers.
At present, a number of suitable amplifiers are commercially available. In the early 1980s, cables that produced signals in the desired microvolt range became available. Recent research has resulted in a better understanding of the properties of surface
EMG recording. Surface electromyography is increasingly used for recording from superficial muscles in clinical or kinesiological protocols, where intramuscular electrodes are used for investigating deep muscles or localized muscle activity.
There are many applications for the use of EMG.
EMG is used clinically for the diagnosis of neurological and neuromuscular problems. It is used diagnostically by gait laboratories and by clinicians trained in the use
of biofeedback or ergonomic assessment. EMG is also used in many types of research laboratories, including those involved in biomechanics, motor control, neuro muscular physiology, movement disorders, postural control, and physical therapy.
Nerve Conduction Study (NCS)
NCS is a test commonly used to evaluate the function of the motor and sensory nerve of human body.
What is Electromyography ?
Electromyography (EMG) is a diagnostic procedure to assess the health of muscles and the nerve cells that control them (motor neurons).
Motor neurons transmit electrical signals that cause muscles to contract. An EMG translates these signals into graphs, sounds or numerical values that a specialist interprets.
Electrical potentials that occur in the cortex after stimulation of a sense organ which can be recorded by surface electrodes is known as Evoked Potential.
When will you need EMG testing ?
when you have:
- Muscle weakness
- Muscle pain or cramping
- Certain types of limb pain
Abnormal EMG come out in the following diseases
Disorders of Muscle
– Inclusion body myopathy
– Myotonia Congenita
– Duchenne Muscular Dystrophy
– Becker muscular dystrophy
– Facioscapulohumeral dystrophy
– Limb girdle muscular dystrophy
– Centronuclear myopathy
– Myotonic dystrophy
Disorders of Nerves
– Carpal tunnel syndrome
– Diabetic neuropathy
– Alcohol related neuropathy
– Nutritional neuropathy
– Bell’s palsy
– Tarsal tunnel syndrome
– Charcot-Marie-Tooth syndrome
– Hemifacial spasm
– Neuralgic Amyotrophy
(idiopathic brachial plexitis)
– Traumatic brachial plexopathy
– Lumbosacral radiculopathy
– Hirayama disease
Motor Neuron Disease (MND)
– Amyotrophic Lateral Sclerosis
– Primary Progressive Myopathy
– Primary Lateral Sclerosis
– Bulbar Palsy
Discrders of Neuoomuscular Junction (NMJ)
– Myasthenia Gravis
– Lambert -Eaton myasthenic syndrome
EMG is a low-risk procedure, and complications are rare.
The neurologist will interpret the results and prepare a report.
Ask the following questions:
There may be some discomfort but tests are not painful.
No, these tests are safe. Outpatient procedure.
Typically, from 30 – 90 minutes.
No sedation required.