NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Muscle recruitment variations during wrist flexion exercise: MR evaluationOBJECTIVE: Many exercise protocols used in physiological studies assume homogeneous and diffuse muscle recruitment. To test this assumption during a "standard" wrist flexion protocol, variations in muscle recruitment were assessed using MRI in eight healthy subjects. MATERIALS AND METHODS: Variations were assessed by comparing the right to the left forearms and the effect of slight (15 degrees) pronation or supination at the wrist. RESULTS: Postexercise imaging showed focal regions of increased signal intensity (SI), indicating relatively strong recruitment, most often in entire muscles, although occasionally only in subvolumes of muscles. In 15 of 26 studies, flexor carpi radialis (FCR) showed more SI than flexor carpi ulnaris, while in 11 studies SI in these muscles increased equivalently. Relatively greater FCR recruitment was seen during pronation and/or use of the nondominant side. Palmaris longus, a wrist flexor, did not appear recruited in 4 of 11 forearms in which it was present. A portion of the superficial finger flexor became hyperintense in 89% of studies, while recruitment of the deep finger flexor was seen only in 43%. CONCLUSION: Inter- and intraindividual variations in forearm muscle recruitment should be anticipated in physiological studies of standard wrist flexion exercise protocols.
Document ID
20050000350
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Fleckenstein, J. L.
(University of Texas Southwestern Medical Center at Dallas 75235-8896)
Watumull, D.
Bertocci, L. A.
Nurenberg, P.
Peshock, R. M.
Payne, J. A.
Haller, R. G.
Blomqvist, C. G.
Date Acquired
August 22, 2013
Publication Date
May 1, 1994
Publication Information
Publication: Journal of computer assisted tomography
Volume: 18
Issue: 3
ISSN: 0363-8715
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: HL-17669
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Cardiopulmonary
Non-NASA Center

Available Downloads

There are no available downloads for this record.
No Preview Available