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Journals and Conferences
In the second part of this study we investigate the correlations between the concentric and conmac action potentials in motor units of individuals with diseases of muscle and nerve. We studied 86 myopathic and 86 neurogenic motor units and compared their concentric and conmac action potentials. In the patients with myopathy, we found that the concentric… (More)
Concentric EMG electrodes can record from a few (10 to 15) muscle fibers of a motor unit (MU). Macro EMG, is able to record from the majority of muscle fibers in the MU. The macro EMG electrode uses a single fiber action potential (SFAP) on one channel to trigger the time locked cannula (macro) response on the other channel. To study the concentric motor… (More)
This paper summarizes the findings gleaned from detailed clinical examinations of three groups of residents who were exposed to trichloroethylene in well water. Also summarized are diagnostic findings for peripheral neuropathy. A detailed description of the neuropsychological test results is included, as well as a summary of domain-specific findings and… (More)
We undertook a study to confirm the existence of an apparent cluster of Bell's palsy in an industrial plant ("W4"), and to test etiologic hypotheses regarding chemical exposures, immune suppression, and infectious etiologies. Cases were enumerated by questionnaire. Employees with a history of Bell's palsy ("cases") were invited to participate in a study… (More)
Although the H-reflex of the triceps surae is used routinely in nerve conduction studies of the lower extremities, doubt still exists concerning the H-reflex in the upper extremities. The H-reflex of the flexor carpi radialis is easily obtainable and can be recorded by a simple nerve conduction technique detailed in this communication.
We set out to study the relationship between a motor unit's size and firing rates and its recruitment threshold and recruitment order. The data were collected from the first dorsal interosseous muscle of 11 normal subjects and analyzed using the precision decomposition and macro electromyography techniques. Our study showed that the recruitment order of a… (More)
A surface electromyographic (EMG) procedure for classifying muscle impairments in persons with low back pain (LBP) is described. The procedure was studied using a device, the Back Analysis System (BAS), to acquire and process EMG signals from six bilateral muscle sites during sustained isometric contractions designed to progressively fatigue the lower back.… (More)
The forearm segment of the ulnar nerve is difficult to assess if the nerve has been injured severely at the wrist. A new, simple nerve conduction technique of recording from the sensory dorsal branch of the nerve localizes the lesion and enables easier evaluation of that segment than do other techniques.
The purpose of this study is to assess the criterion validity of peroneal and posterior tibial nerve conduction measurements obtained with the NC-stat system. Sixty patients referred to the Boston VA EMG laboratory were enrolled. Each subject had a full study of the lower extremity performed using traditional EMG equipment prior to obtaining the NC-stat… (More)