Journal of Applied Physiology Ad Instruments
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J Appl Physiol 89: 61-71, 2000;
8750-7587/00 $5.00
This Article
Right arrow Full Text Free
Right arrow Full Text (PDF) Free
Right arrow Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when eLetters are posted
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Web of Science (60)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Burnett, R. A.
Right arrow Articles by Enoka, R. M.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Burnett, R. A.
Right arrow Articles by Enoka, R. M.
Vol. 89, Issue 1, 61-71, July 2000

Coactivation of the antagonist muscle does not covary with steadiness in old adults

Rebecca A. Burnett, Douglass H. Laidlaw, and Roger M. Enoka

Department of Kinesiology and Applied Physiology, University of Colorado, Boulder, Colorado 80309-0354

The purpose of the study was to determine the association between steadiness and activation of the agonist and antagonist muscles during isometric and anisometric contractions. Young (n = 14) and old (n = 15) adults used the first dorsal interosseus muscle to perform constant-force and constant-load tasks (2.5, 5, 20, 50, and 75% maximum) with the left index finger. Steadiness was quantified as the coefficient of variation of force and the SD of acceleration normalized to the load lifted. The old adults were less steady at most target forces with isometric contractions (2.5, 5, and 50%) and with most loads during the anisometric contractions (2.5, 5, and 20%). Furthermore, the old adults were less steady when performing lengthening contractions (up to 50%) compared with shortening contractions, whereas there was no difference for young adults. The reduced steadiness exhibited by the old adults during these tasks was not associated with differences in the average level of agonist muscle electromyogram or with coactivation of the antagonist muscle.

aging; muscle activation; hand; finger control; first dorsal interosseous


This article has been cited by other articles:


Home page
 J. Physiol.Home page
J. Duchateau and R. M. Enoka
Neural control of shortening and lengthening contractions: influence of task constraints
J. Physiol., December 15, 2008; 586(24): 5853 - 5864.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
M. Hoffren, M. Ishikawa, and P. V. Komi
Age-related neuromuscular function during drop jumps
J Appl Physiol, October 1, 2007; 103(4): 1276 - 1283.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
J. G. Semmler, K. J. Tucker, T. J. Allen, and U. Proske
Eccentric exercise increases EMG amplitude and force fluctuations during submaximal contractions of elbow flexor muscles
J Appl Physiol, September 1, 2007; 103(3): 979 - 989.
[Abstract] [Full Text] [PDF]

Home page
 J. Neurophysiol.Home page
E. A. Christou, B. Poston, J. A. Enoka, and R. M. Enoka
Different Neural Adjustments Improve Endpoint Accuracy With Practice in Young and Old Adults
J Neurophysiol, May 1, 2007; 97(5): 3340 - 3350.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
J. Duchateau, J. G. Semmler, and R. M. Enoka
Training adaptations in the behavior of human motor units
J Appl Physiol, December 1, 2006; 101(6): 1766 - 1775.
[Abstract] [Full Text] [PDF]

Home page
 J. Physiol.Home page
A. J. Fuglevand, A. P. Dutoit, R. K. Johns, and D. A. Keen
Evaluation of plateau-potential-mediated 'warm up' in human motor units
J. Physiol., March 15, 2006; 571(3): 683 - 693.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
M. Shinohara, C. T. Moritz, M. A. Pascoe, and R. M. Enoka
Prolonged muscle vibration increases stretch reflex amplitude, motor unit discharge rate, and force fluctuations in a hand muscle
J Appl Physiol, November 1, 2005; 99(5): 1835 - 1842.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
M. Klass, S. Baudry, and J. Duchateau
Aging does not affect voluntary activation of the ankle dorsiflexors during isometric, concentric, and eccentric contractions
J Appl Physiol, July 1, 2005; 99(1): 31 - 38.
[Abstract] [Full Text] [PDF]

Home page
 J. Neurophysiol.Home page
M. M. Sturman, D. E. Vaillancourt, and D. M. Corcos
Effects of Aging on the Regularity of Physiological Tremor
J Neurophysiol, June 1, 2005; 93(6): 3064 - 3074.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
K. W. Kornatz, E. A. Christou, and R. M. Enoka
Practice reduces motor unit discharge variability in a hand muscle and improves manual dexterity in old adults
J Appl Physiol, June 1, 2005; 98(6): 2072 - 2080.
[Abstract] [Full Text] [PDF]

Home page
 J. Neurophysiol.Home page
C. T. Moritz, B. K. Barry, M. A. Pascoe, and R. M. Enoka
Discharge Rate Variability Influences the Variation in Force Fluctuations Across the Working Range of a Hand Muscle
J Neurophysiol, May 1, 2005; 93(5): 2449 - 2459.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
C. I. Morse, J. M. Thom, K. M. Birch, and M. V. Narici
Tendon elongation influences the amplitude of interpolated doublets in the assessment of activation in elderly men
J Appl Physiol, January 1, 2005; 98(1): 221 - 226.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
J. K. Shim, B. S. Lay, V. M. Zatsiorsky, and M. L. Latash
Age-related changes in finger coordination in static prehension tasks
J Appl Physiol, July 1, 2004; 97(1): 213 - 224.
[Abstract] [Full Text] [PDF]

Home page
 Journals of Gerontology Series A: Biological Sciences and Medical SciencesHome page
B. K. Barry and R. G. Carson
The Consequences of Resistance Training for Movement Control in Older Adults
J. Gerontol. A Biol. Sci. Med. Sci., July 1, 2004; 59(7): M730 - M754.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
M. Shinohara, Y. Yoshitake, M. Kouzaki, H. Fukuoka, and T. Fukunaga
Strength training counteracts motor performance losses during bed rest
J Appl Physiol, October 1, 2003; 95(4): 1485 - 1492.
[Abstract] [Full Text] [PDF]

Home page
 J. Neurophysiol.Home page
A. M. Taylor, E. A. Christou, and R. M. Enoka
Multiple Features of Motor-Unit Activity Influence Force Fluctuations During Isometric Contractions
J Neurophysiol, August 1, 2003; 90(2): 1350 - 1361.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
E. A. Christou, M. Shinohara, and R. M. Enoka
Fluctuations in acceleration during voluntary contractions lead to greater impairment of movement accuracy in old adults
J Appl Physiol, July 1, 2003; 95(1): 373 - 384.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
M. Shinohara, K. G. Keenan, and R. M. Enoka
Contralateral activity in a homologous hand muscle during voluntary contractions is greater in old adults
J Appl Physiol, March 1, 2003; 94(3): 966 - 974.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
D. H. Laidlaw, S. K. Hunter, and R. M. Enoka
Nonuniform activation of the agonist muscle does not covary with index finger acceleration in old adults
J Appl Physiol, October 1, 2002; 93(4): 1400 - 1410.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
E. A. Christou and L. G. Carlton
Age and contraction type influence motor output variability in rapid discrete tasks
J Appl Physiol, August 1, 2002; 93(2): 489 - 498.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
B. L. Tracy and R. M. Enoka
Older adults are less steady during submaximal isometric contractions with the knee extensor muscles
J Appl Physiol, March 1, 2002; 92(3): 1004 - 1012.
[Abstract] [Full Text] [PDF]

Home page
 Journals of Gerontology Series A: Biological Sciences and Medical SciencesHome page
E. A. Christou and L. G. Carlton
Old Adults Exhibit Greater Motor Output Variability Than Young Adults Only During Rapid Discrete Isometric Contractions
J. Gerontol. A Biol. Sci. Med. Sci., December 1, 2001; 56(12): B524 - 532.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Visit Other APS Journals Online