| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
1 Department of Life Sciences, University of Tokyo, Komaba, Meguro, Tokyo 153-8902; and 2 Laboratory for Exercise Physiology, Tokyo Metropolitan College, Akishima-shi, Tokyo 196, Japan
Nine healthy men (22-45 yr) completed 100 repetitive maximal isometric contractions of the ankle plantar flexor muscles in two knee positions of full extension (K0) and flexion at 90° (K90), positions that varied the contribution of the gastrocnemii. Electromyographic activity was recorded from the medial and lateral gastrocnemii and soleus muscles by using surface electrodes. Plantar flexion torque in K0 was greater and decreased more rapidly than in K90. The electromyographic amplitude decreased over time, and there were no significant differences between muscles and knee joint positions. The level of voluntary effort, assessed by a supramaximal electrical stimulation during every 10th contraction, decreased from 96 to 70% (P < 0.05) with no difference between K0 and K90. It was suggested that a decrease in plantar flexion torque was attributable to both central and peripheral fatigue and that greater fatigability in K0 than in K90 would result from a greater contribution and hence more pronounced fatigue of the gastrocnemius muscle. Further support for this possibility was provided from changes in twitch torque.
gastrocnemius and soleus muscles; plantar flexion; electrical stimulation; twitch interpolation; central and peripheral fatigue; fiber types
This article has been cited by other articles:
|
|
 |
|
  J. L. Taylor and S. C. Gandevia A comparison of central aspects of fatigue in submaximal and maximal voluntary contractions J Appl Physiol, February 1, 2008; 104(2): 542 - 550. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 A. Mendez-Villanueva, J. Fernandez-Fernandez, and D. Bishop Exercise-induced homeostatic perturbations provoked by singles tennis match play with reference to development of fatigue Br. J. Sports Med., November 1, 2007; 41(11): 717 - 722. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 A. K. McConnell and M. Lomax The influence of inspiratory muscle work history and specific inspiratory muscle training upon human limb muscle fatigue J. Physiol., November 15, 2006; 577(1): 445 - 457. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. M. Thomas, S. S. Cheung, G. C. Elder, and G. G. Sleivert Voluntary muscle activation is impaired by core temperature rather than local muscle temperature J Appl Physiol, April 1, 2006; 100(4): 1361 - 1369. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 H. Song, K. Nakazato, and H. Nakajima Effect of Increased Excursion of the Ankle on the Severity of Acute Eccentric Contraction-Induced Strain Injury in the Gastrocnemius: An In Vivo Rat Study Am. J. Sports Med., July 1, 2004; 32(5): 1263 - 1269. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. Klass, N. Guissard, and J. Duchateau Limiting mechanisms of force production after repetitive dynamic contractions in human triceps surae J Appl Physiol, April 1, 2004; 96(4): 1516 - 1521. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. M. Nordlund, A. Thorstensson, and A. G. Cresswell Central and peripheral contributions to fatigue in relation to level of activation during repeated maximal voluntary isometric plantar flexions J Appl Physiol, January 1, 2004; 96(1): 218 - 225. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 S. C. Gandevia Spinal and Supraspinal Factors in Human Muscle Fatigue Physiol Rev, October 1, 2001; 81(4): 1725 - 1789. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
N. A. Maffiuletti, M. Pensini, and A. Martin Activation of human plantar flexor muscles increases after electromyostimulation training J Appl Physiol, April 1, 2002; 92(4): 1383 - 1392. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| Visit Other APS Journals Online |
