| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
Department of Physiological Sciences, National Institute of Fitness and Sports, Shiromizu, Kanoya, Kagoshima 891-23; Ishikawa National College of Technology, Kitachujo, Tsubata, Kahoku, Ishikawa 929-03; and Departments of Orthopedic Surgery and Anatomy, Faculty of Medicine, Kagoshima University, Sakuragaoka, Kagoshima 893, Japan
The purpose of this study was to investigate the functional interrelationship between synergistic muscle activities during low-level fatiguing contractions. Six human subjects performed static and dynamic contractions at an ankle joint angle of 110° plantar flexion and within the range of 90-110° (anatomic position = 90°) under constant load (10% maximal voluntary contraction) for 210 min. Surface electromyogram records from lateral gastrocnemius (LG), medial gastrocnemius (MG), and soleus (Sol) muscles showed high and silent activities alternately in the three muscles and a complementary and alternate activity between muscles in the time course. In the second half of all exercise times, the number of changes in activity increased significantly (P < 0.05) in each muscle. The ratios of active to silent periods of electromyogram activity were significantly higher (P < 0.05) in MG (4.5 ± 2.2) and Sol (4.3 ± 2.8) than in the LG (0.4 ± 0.1), but no significant differences were observed between MG and Sol. These results suggest that the relative activation of synergistic motor pools are not constant during a low-level fatiguing task.
electromyogram; triceps surae muscle; ankle plantar flexions; human
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]
|
|
|
|
|
|
T. Rudroff, B. K. Barry, A. L. Stone, C. J. Barry, and R. M. Enoka Accessory muscle activity contributes to the variation in time to task failure for different arm postures and loads J Appl Physiol, March 1, 2007; 102(3): 1000 - 1006. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. Kouzaki and M. Shinohara The frequency of alternate muscle activity is associated with the attenuation in muscle fatigue J Appl Physiol, September 1, 2006; 101(3): 715 - 720. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. Kouzaki, M. Shinohara, K. Masani, and T. Fukunaga Force fluctuations are modulated by alternate muscle activity of knee extensor synergists during low-level sustained contraction J Appl Physiol, December 1, 2004; 97(6): 2121 - 2131. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. K. Hunter, A. Critchlow, I.-S. Shin, and R. M. Enoka Fatigability of the elbow flexor muscles for a sustained submaximal contraction is similar in men and women matched for strength J Appl Physiol, January 1, 2004; 96(1): 195 - 202. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L Rochette, S. K. Hunter, N Place, and R Lepers Activation varies among the knee extensor muscles during a submaximal fatiguing contraction in the seated and supine postures J Appl Physiol, October 1, 2003; 95(4): 1515 - 1522. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. Kouzaki, M. Shinohara, K. Masani, M. Tachi, H. Kanehisa, and T. Fukunaga Local blood circulation among knee extensor synergists in relation to alternate muscle activity during low-level sustained contraction J Appl Physiol, July 1, 2003; 95(1): 49 - 56. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. K. Hunter, R. Lepers, C. J. MacGillis, and R. M. Enoka Activation among the elbow flexor muscles differs when maintaining arm position during a fatiguing contraction J Appl Physiol, June 1, 2003; 94(6): 2439 - 2447. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 S. K. Hunter, D. L. Ryan, J. D. Ortega, and R. M. Enoka Task Differences With the Same Load Torque Alter the Endurance Time of Submaximal Fatiguing Contractions in Humans J Neurophysiol, December 1, 2002; 88(6): 3087 - 3096. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. Kouzaki, M. Shinohara, K. Masani, H. Kanehisa, and T. Fukunaga Alternate muscle activity observed between knee extensor synergists during low-level sustained contractions J Appl Physiol, August 1, 2002; 93(2): 675 - 684. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. K. Hunter and R. M. Enoka Sex differences in the fatigability of arm muscles depends on absolute force during isometric contractions J Appl Physiol, December 1, 2001; 91(6): 2686 - 2694. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. J. Plaskett and E. Cafarelli Caffeine increases endurance and attenuates force sensation during submaximal isometric contractions J Appl Physiol, October 1, 2001; 91(4): 1535 - 1544. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. A. Hodgson, S. Wichayanuparp, M. R. Recktenwald, R. R. Roy, G. McCall, M. K. Day, D. Washburn, J. W. Fanton, I. Kozlovskaya, and V. R. Edgerton Circadian Force and EMG Activity in Hindlimb Muscles of Rhesus Monkeys J Neurophysiol, September 1, 2001; 86(3): 1430 - 1444. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. G. Semmler, D. V. Kutzscher, and R. M. Enoka Gender Differences in the Fatigability of Human Skeletal Muscle J Neurophysiol, December 1, 1999; 82(6): 3590 - 3593. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
Y. Ohira, T. Yoshinaga, M. Ohara, I. Nonaka, T. Yoshioka, K. Yamashita-Goto, B. S. Shenkman, I. B. Kozlovskaya, R. R. Roy, and V. R. Edgerton Myonuclear domain and myosin phenotype in human soleus after bed rest with or without loading J Appl Physiol, November 1, 1999; 87(5): 1776 - 1785. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| Visit Other APS Journals Online |
