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The goal of this prospective electrophysiologic study is to describe the chronological electromyographic findings observed in a human gastrocnemius muscle following a traumatic tear. A 30-year-old man sustained a tear of the medial gastrocnemius. Needle electromyography was performed serially at 5, 15, and 26 weeks post-injury, with the contralateral gastrocnemius muscle serving as a control. Audiovisual recordings of the studies were analyzed in a blinded manner. Five weeks post-injury, the affected gastrocnemius displayed increased insertional activity on electromyography. By 15 weeks post-injury, insertional activity had diminished. However, motor unit action potentials showed chronic neurogenic morphological changes not previously observed. These changes persisted 26 weeks post-injury. The study findings reveal a chronological trajectory of increased insertional activity followed by reinnervation changes in a human muscle after local trauma, paralleling a course previously observed in a rat model. Electrodiagnosticians unaware of this phenomenon are at risk for making erroneous interpretations when examining patients with a history of muscle trauma.
This article was published in the following journal.
Name: American journal of physical medicine & rehabilitation
Many studies have evaluated the role of DWI in musculoskeletal diseases but less is known on muscle tears. Especially for professional athletes, muscle injuries are responsible for large time lost. Th...
Tear secretion is critical for maintenance of healthy ocular surface and vision. Most of normal subjects and dry eye patients feel worsening of ocular dryness in the afternoon, however, diurnal variat...
Muscle fat content of the rotator cuff increases after a tear. In the healthy rotator cuff, the influence of age, body mass index (BMI) and critical shoulder angle (CSA) on muscle fat content is unkno...
Current understanding of human motor unit (MU) control and ageing is mostly derived from hand and limb muscles that have spinal motor neuron innervations. The aim here was to characterize and test whe...
The sarcolemmal resting membrane potential (RMP) affects muscle excitability, contractility and force generation. There is however limited in vivo data on the normal RMP of the human sarcolemma betwee...
The significance of our study is in the importance of understanding the quality and quantity of proteins in the human tear film from diseased and non-diseased patients. This pilot study w...
the improvement of symptoms and disease progress by the treatment of OA of the knee with PRGF
Purpose: to build a library of normal tear lacritin values by collecting tears from normal adult human subjects and to develop a non-invasive clinical assay for lacritin. Such an assay wi...
The purpose of this study is to investigate how the addition of a new artificial tear product when applied to the tear layer affects contrast sensitivity and optical aberrations over time....
Dry eye syndrome (DES) is a highly prevalent ocular condition with potential severe consequences for affected patients. DES can be either caused by decreased tear production or increased t...
The tear-forming and tear-conducting system which includes the lacrimal glands, eyelid margins, conjunctival sac, and the tear drainage system.
A process fundamental to muscle physiology whereby an electrical stimulus or action potential triggers a myocyte to depolarize and contract. This mechanical muscle contraction response is regulated by entry of calcium ions into the cell.
The shortest duration of an electrical stimulus where the threshold amplitude is twice the rheobase - the minimum required for eliciting an ACTION POTENTIAL at any time period. It is a measure of the excitability of nerve or muscle tissue, and is characteristic of types and/or condition of the nerve or muscle cells in the tissue.
A subdiscipline of human genetics which entails the reliable prediction of certain human disorders as a function of the lineage and/or genetic makeup of an individual or of any two parents or potential parents.
Recording of the changes in electric potential of muscle by means of surface or needle electrodes.
Arthritis Fibromyalgia Gout Lupus Rheumatic Rheumatology is the medical specialty concerned with the diagnosis and management of disease involving joints, tendons, muscles, ligaments and associated structures (Oxford Medical Diction...
Anxiety is caused by stress. It is a natural reaction, and is beneficial in helping us deal with tense situations and pressure. It is deterimental when is becomes an excessive, irrational dread of everyday situations. The most common types of anxiety di...