Electromyography Essay

1593 words - 6 pages

The purpose of this lab was to determine how much electrical activity was conducted through the flexor digitorm muscles of the forearm of both the dominant and non-dominant arms using electromyography. The electrical activity increased within the muscles that are contracted with each stronger contraction. Electromyography records the electron signals that are associated with muscle activation. The electrical activity (motor unit recruitment) increases in the muscles that are being contracted. An electromyography detects the electrical potential generated by muscle cells when they contract or relax. These muscles are stimulated by signals from nerve cells (motor neurons). Once muscles are stimulated and causes the muscle to contract, the contraction produces an electrical signal. The function of a muscle is to convert chemical reactions to mechanical reactions, causing muscles to contract, or shorten. There is either afferent signal, which sends signals away from the muscle towards the brain or efferent signals, which send signals from the neuron to the muscle to cause a contraction. A motor unit is a motor neuron and all of the muscle fibers that it innervates. Although a single motor neuron can innervate several fibers, each muscle fiber is innervated by only one motor neuron. The size of a motor unit determines the speed in which it travels and how many muscle fibers are needed to perform the contraction. When you have to increase the strength that is needed in a muscle contraction, the brain sends a signal to the motor neurons. When a somatic motor neuron generates an action potential, all of the muscle fibers it innervates respond to the secreted neurotransmitter by generating their own action potential and contracting.MethodFor our group experiment, the subject placed three electrodes on the gastrocnemius muscle of her leg. She proceeded to do four calf raises. The first two were done without weight added and the second two were done with weight added to the subjects back using a back pack that weighed approximatelyResultsThe subject in the first experiment was Christina Shaver, a 36 year old female who is 5'4 inches and 160 pounds. In the first recording, four clenches of increasing forces were documented. In channel 41, the force exerted in kg was recorded; in channel 1 is the RAW EMG, which is the straight reading of the potential differences detected at the electrode and in channel 40, the integrated EMG is recorded. EMG is the running average if the RAW EMG. In this recording, the clench force of the dominant arm increased by almost four times from the first clench force which was 5.05 kg to the fourth clench which was 19.72 kg. The electrical output also increased by almost four times from .36 mv at the first clench to 1.40 mv at the fourth clench. The integrated EMG also increased four times from the first clench of .05 mv-sec to .20 mv-sec at the fourth clench. Using the second forearm which was the non-dominant arm, the first clench...

Find Another Essay On electromyography

Illustratte Technique and How It Relates to Performance

1426 words - 6 pages are available for quantifying biomechanical movement such as electromyography, plantar pressure and kinetic analysis. Technique is not always a positive indicator of performance as good technique is not always an indicator of good performance, there can be other influences although generally good technique can improve performance (Lees, 1992). Technique analysis’ are useful in aiding coaches improve athletes performance by linking their

What is Amyotrophic lateral sclerosis? Essay

1373 words - 5 pages began to lose strength in his muscles; To this day, Hawkings is still alive at age 74 (Stephen Hawkings-Home). There is no cure or treatment for ALS. Riluzole is a FDA approved drug that slows down the progression but does not stop ALS (What is ALS). Also there isn't a test that can provide a definitive diagnosis of ALS (Amyotrophic Lateral Sclerosis Fact Sheet). Electromyography (EMG) is a special recording technique that detects electrical

Repetitive Strain Injury

996 words - 4 pages inflammation in the affected area. Anti-inflammatory medications are also commonly prescribed to reduce pain and inflammation. In severe cases, surgery such as surgical decompression may be required. Along with physiotherapy, behavioral therapy is frequently used in the treatment of repetitive strain injury. Behavioral therapy includes relaxation training and electromyography or EMG biofeedback. A third treatment commonly used is an

Motor Learning and Control in Adults

2991 words - 12 pages reduce because of the length of the arm from the distal point, which will be less and it might vary from person to person. REFERENCES [1]. Heather D, Kevin E, Usha K, Muscle Activation Patterns of the Forearm: High-Density Electromyography Data of Normally Limbed and Transradial Amputee Subjects. JPO 2010; Vol 22, Num4, p244 [2]. Ali Ameri, Member, Erik J. Scheme, Ernest N. Kamavuako, Kevin B. Englehart, Philip A. Parker, Real Time

The Use of Technology in Both the Training Methods and Training Environment of Elite Athletes in Global Sport

1110 words - 4 pages international competitions, most nations have their own team behind them. This normally consists of a team doctor, a team physiotherapist and sometimes a nutritionist. The requirement for technology applies here, in the need for the physiotherapist to be able to his job correctly he must have such things a ultrasonic/ultrasound machines for deep tissue therapy, and electromyography equipment to analyse muscle activity

ALS or Lou Gehrig’s Disease

886 words - 4 pages history of the disease), breathing test to check lung muscles, and an electromyography which is a test designed to see and determine which muscles and nerves aren’t functioning properly. Once diagnosed with ALS, the typical life span is 3-5 yeas. ALS attacks the cells in the brain. Hence, which is why it is called a neurological disorder. The nerve cells that are located in the brain and spinal cord that are in charge of “handling voluntary


703 words - 3 pages stimulus was characterized with a rise-and-fall time of 2 ms and a plateau time of 2ms. The response was also a band pass filtered (20-2000Hz) and amplified (5000x). We considered the latency, amplitude of two positive –negative wave’s p13-n23 and the amplitude ratio. The amplitude ratio between the two ears was also calculated as follows: (AR-AL)/(AR+AL)*100 As AR is the amplitude of the right ear and AL is the amplitude of the left ear; the Values above %36 were considered abnormal[10]. The consistent tonic contraction of the SCM was monitored via internal Electromyography (EMG) of EP25 Interacoustic, which the amplitude was set at the 40-60 µv.


814 words - 4 pages , child position) are limitations of this study. Two hypotheses may be related to the findings of present study; the recruitment of participants (according to the inclusion criteria) and controlling the activity of the SCM muscle. Participants could understand and follow verbal comments, be able to stand independently, move and turn head and neck without limitation. Tone burst (500Hz) VEMP performed via EP25 with internal Electromyography (EMG


697 words - 3 pages electromyography responses of the Sternoclidomastoid (SCM) muscle following high level acoustic stimulations of the saccule via the vestibulocollic reflex pathway. cVEMP starts in the saccular maculla of the inner ear, moves to the scarpa's gangelion, through conducting the inferior vestibular never, the lateral vestibular nucleus, the medial vestibulespinal tract, and then the motor neurons of the SCM muscle[6]. The VEMPs have been extensively reported

Patient With Dermatomyositis

1034 words - 4 pages extremity weakness, the patient developed facial rashes, abdominal, and joint pain. Patient first began noticing symptoms while ascending stairs, and felt a sense of heaviness. The patient was diagnosed with dermatmyositis on 9/3/13 by an outside hospital after undergoing a left deltoid biopsy, electromyography, and nerve conduction studies. Patient was then initially treated with IV solumedrol for five days. The patient then developed neck extensor

How to Read Your Mind – Neuromarketing

846 words - 4 pages Magnetic Resonance Imaging. It shows the energetic economy of the brain such as blood oxygenation and glucose combustion and which reflects mental process of the brain. Second, electromyography, EMG, measures the facial muscles’ electrical potential to evaluate reactions to specific advertisement. We can verify whether advertisement is perceived positively since we know which muscles represent specific emotions such as happiness, fear, or anger. Third

Similar Essays

Amyotophic Lateral Sclerosis Case Study

1165 words - 5 pages electromyography or a nerve conduction study to rule out other conditions which share similar symptoms. An electromyography or ‘EMG’ detects and records electrical activities in the muscles. Due to the patients inability to maintain full control over his mouth resulting in slurred speech, the physician recommended a nerve conduction study or ‘NCS’ if he could not receive the ‘EMG’. A nerve conduction study measures the bodies electrical energy by

Common Sports Injury Essay

1069 words - 5 pages treatments. What is the recommended treatment for the injury (immobilization, taping, surgery)? To test for Cubital Tunnel Syndrome, doctors must run an electromyography (EMG) test. An electromyography is a technique for evaluating and recording electrical activity produced by skeletal muscles. If the EMG reveals there is minimal pressure on the ulnar nerve, the therapies are less invasive. Less severe cases of Cubital Tunnel therapy includes

Endurance And Strength Training Effects On Physiological And Muscular Parameters During Prolonged Cycling

2621 words - 10 pages Introduction: The research study my group and I examined was titled, “Endurance and Strength Training Effects on Physiological and Muscular Parameters during Prolonged Cycling.” This study done by Hausswirth et. all was published in 2010 in the Journal of Electromyography and Kinesiology. When performing in a triathlon, which consists of swimming, cycling, and running in a single continuous event, it is generally accepted throughout the

Guillain Barre Syndrome Descrption Essay

2318 words - 9 pages , loss or reduction of functions of the autonomic system, difficulty breathing and dizziness. Diagnosis The symptoms of a certain syndrome are usually varied causing doctors, on rare occasions, to have a difficult time in the diagnosis of GBS in its early stage. There are, however, different means that may be used to diagnose GBS. These are Lumbar Puncture, Nerve Conduction Studies (NCS) or Electromyography (EMG or electromyogram). Lumbar