Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2016) 15, 327 - 334

Research article
The Influence of a Bout of Exertion on Novice Barefoot Running Dynamics
Rami Hashish , Sachithra D. Samarawickrame, Lucinda Baker, George J. Salem
Author Information
Division of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, CA, USA

Rami Hashish
‚úČ Division of Biokinesiology and Physical Therapy, University of Southern California, 1540 Alcazar Street, Los Angeles, CA 90033, USA
Email: hashishr@gmail.com
Publish Date
Received: 26-01-2016
Accepted: 06-04-2016
Published (online): 23-05-2016
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ABSTRACT

Barefoot, forefoot strike (FFS) running has recently risen in popularity. Relative to shod, rear-foot strike (RFS) running, employing a FFS is associated with heightened triceps surae muscle activation and ankle mechanical demand. Novice to this pattern, it is plausible that habitually shod RFS runners exhibit fatigue to the triceps surae when acutely transitioning to barefoot running, thereby limiting their ability to attenuate impact. Therefore, the purpose was to determine how habitually shod RFS runners respond to an exertion bout of barefoot running, operationally defined as a barefoot run 20% of mean daily running distance. Twenty-one RFS runners performed novice barefoot running, before and after exertion. Ankle peak torque, triceps surae EMG median frequency, foot-strike patterns, joint energy absorption, and loading rates were evaluated. Of the 21 runners, 6 maintained a RFS, 10 adopted a mid-foot strike (MFS), and 5 adopted a FFS during novice barefoot running. In-response to exertion, MFS and FFS runners demonstrated reductions in peak torque, median frequency, and ankle energy absorption, and an increase in loading rate. RFS runners demonstrated reductions in peak torque and loading rate. These results indicate that a short bout of running may elicit fatigue to novice barefoot runners, limiting their ability to attenuate impact.

Key words: Fatigue, Footwear, Foot-Strike, Loading Rate, EMG, Torque


           Key Points
  • In response to exertion, novice barefoot runners demonstrate fatigue to their soleus.
  • In response to exertion, novice barefoot runners demonstrate a reduction in ankle energy absorption
  • In response to exertion, novice barefoot runners demonstrate an increase in loading rate
 
 
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