Journal of Applied Physiology Fuel your research with LabChart
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J Appl Physiol 91: 1307-1317, 2001;
8750-7587/01 $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 ISI 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 ISI Web of Science (19)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Wakeling, J. M.
Right arrow Articles by Stergiou, P.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Wakeling, J. M.
Right arrow Articles by Stergiou, P.
Vol. 91, Issue 3, 1307-1317, September 2001

Muscle activity in the leg is tuned in response to ground reaction forces

James M. Wakeling, Vinzenz Von Tscharner, Benno M. Nigg, and Pro Stergiou

Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada T2N 1N4

During walking and running, the human body reacts to its external environment. One such response is to the impact forces that occur at heel strike. This study tested previous speculation that the levels of muscle activity in the lower extremities are adjusted in response to the loading rate of the impact forces. A pendulum apparatus was used to deliver repetitive impacts to the heels of 20 subjects. Impact forces were of similar magnitude to those experienced during running, but the loading rate was varied by 13% using different materials in the subjects' shoes. Myoelectric patterns were measured in the tibialis anterior, medial gastrocnemius, vastus medialis, and biceps femoris muscles. Wavelet analysis was used to resolve intensity of the myoelectric patterns into time and frequency space. Substantial and significant differences in the myoelectric activity occurred between the impact conditions for the 50 ms before and the 50 ms after impact, reaching 3 ms in timing, 16% in wavelet number, and 154% in the intensity of the muscle activity.

electromyogram; wavelet; impact force; time-frequency analysis


This article has been cited by other articles:


Home page
 Br. J. Sports. Med.Home page
S. J Warden, M. W Creaby, A. L Bryant, and K. M Crossley
Stress fracture risk factors in female football players and their clinical implications
Br. J. Sports Med., August 1, 2007; 41(suppl_1): i38 - i43.
[Abstract] [Full Text] [PDF]

Home page
 J. Exp. Biol.Home page
E. F. Hodson-Tole and J. M. Wakeling
Variations in motor unit recruitment patterns occur within and between muscles in the running rat (Rattus norvegicus)
J. Exp. Biol., July 1, 2007; 210(13): 2333 - 2345.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
J. M. Wakeling, B. M. Nigg, and A. I. Rozitis
Muscle activity damps the soft tissue resonance that occurs in response to pulsed and continuous vibrations
J Appl Physiol, September 1, 2002; 93(3): 1093 - 1103.
[Abstract] [Full Text] [PDF]

Home page
 J. Exp. Biol.Home page
J. M. Wakeling, M. Kaya, G. K. Temple, I. A. Johnston, and W. Herzog
Determining patterns of motor recruitment during locomotion
J. Exp. Biol., February 1, 2002; 205(3): 359 - 369.
[Abstract] [Full Text] [PDF]


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