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Article type: Research Article
Authors: Housh, Dona J.a; *; ** | Housh, Terry J.a; *** | Johnson, Glen O.a; **** | Chu, Wei-Koma; *****
Affiliations: [a] University of Nebraska Medical Center and University of Nebraska, Lincoln
Note: [*] University of Nebraska, Medical Center, College of Dentistry, Department of Oral Biology, Lincoln, NE 68508.
Note: [**] Address reprint requests to Dr. Dona J. Housh, 51A Dent, College of Dentistry, UNMC, Lincoln, NE 68588-0740.
Note: [***] University of Nebraska, School of Health and Human Performance, Lincoln, NE 68508.
Note: [****] University of Nebraska, School of Health and Human Performance, Lincoln, NE 68508.
Note: [*****] University of Nebraska, Medical Center, Department of Radiology, UNMC, Lincoln, NE 68508.
Abstract: The purpose of this investigation was to use magnetic resonance imaging (MRI) to examine the relationships between the cross-sectional area (CSA) of the flexors and extensors of the forearm and isokinetic peak torque at speeds of contraction from zero to 300 deg/sec. Ten men (mean ± SO = 23.9 ± 4.5 years) volunteered as subjects for this study. Peak torque values for flexion and extension of the forearm were determined at 0, 60, 120, 180, 240, and 300 deg/sec using a Cybex II isokinetic dynamometer. For the forearm flexors, the only significant (p < 0.05) correlations between muscle CSA and peak torque were at zero (r = 0.73), 60 (r = 0.85), and 120 deg/sec (r = 0.76). There were no significant (p > 0.05) correlations for the forearm extensors. It is likely that these findings were most influenced by the contribution of primarily fast-twitch fibers to peak torque at fast speeds of contraction and the differences in architecture (parallel versus pennate fiber orientation) of the forearm flexors versus extensor muscles.
Keywords: Cross-sectional area, magnetic resonance imaging, correlation, forearm flexors and extensors, peak isokinetic torque
DOI: 10.3233/IES-1993-3302
Journal: Isokinetics and Exercise Science, vol. 3, no. 3, pp. 133-138, 1993
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