Search PubMed⌕ Search

Biomedical subjects

R M Nelson

Publications and source records attributed to R M Nelson.

At least 181 records · Page 10Linked to original sources
PubMedDate not supplied

Comparison of motor unit action potential characteristics and hand dominance using monopolar needle electrodes in the abductor pollicis brevis and abductor digiti minimi muscles.

This study examined specific electrical characteristics of voluntary single motor unit action potentials (SMUAPs): amplitude, duration, phase change, and rate of rise. These characteristics, which were detected from two intrinsic muscles of the hand--the abductor pollicis brevis and the abductor digiti minimi--were compared to hand dominance. Forty subjects participated in the study. Five characteristics were detected from each muscle using the quadrant technique while the subject produced a minimal isometric contraction. Based on results of an ANOVA [two-factor with replication] test, our study revealed no significant difference between muscles in the dominant and non-dominant hands. Descriptive statistics for each muscle characteristic are presented. This study has identified parameters for SMUAP characteristics detected in non-impaired individuals ranging in age from 20 to 43 years. The normative parameters serve as a valuable base from which one may examine potential neuronal damage from cumulative trauma disorders.

Action Potentials↗
PubMedDate not supplied

Neuronal conduction studies of the median nerve in non-impaired humans: a comparison of accepted techniques.

BACKGROUND AND PURPOSE: There are two commonly accepted techniques used for distal electro-stimulation placement when performing median motor nerve conduction studies. The purpose of this study was to compare latency using two commonly accepted sites of distal stimulation of the median nerve when performing motor nerve conduction studies on non-impaired adult humans. PARTICIPANTS: The sample consisted of 36 non-impaired participants (15 female, 21 male) aged 20 to 40 years. METHODS: Participants were randomly assigned to two groups and tested bilaterally for the median motor nerve. For distal stimulation of the median motor nerve, in the first group, 8 cm was measured from the center of the muscle diagonally to arrive at a point between the flexor carpi radialis and plamaris longus tendons. In the second group, 3.5 cm was measured from the distal wrist crease proximally along the median nerve for the distal stimulation of the median motor nerve. Distal latency of both techniques was obtained. Surface skin temperature of the palm was recorded throughout the procedures. RESULTS: No significant differences were found between the 8 cm and 3.5 cm techniques at p < or = 0. 05 level. COMMENT: Even though no differences were found between the two techniques, the 3.5-cm technique is recommended because of its consistency as an anatomical landmark reducing the potential for measurement error.

Adult↗