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 (2014) 13, 921 - 928

Research article
Frowning and Jaw Clenching Muscle Activity Reflects the Perception of Effort During Incremental Workload Cycling
Ding-Hau Huang1, Shih-Wei Chou2, Yi-Lang Chen3, Wen-Ko Chiou4, 
Author Information
1 Graduate School of Management, Chang Gung University, Tao-Yuan, Taiwan
2 Doctor in Charge, Fit Great Clinic, Taipei, Taiwan
3 Department of Industrial Engineering and Management, Ming Chi University of Technology, New Taipei City, Taiwan
4 Department of Industrial Design, Chang Gung University, Tao-Yuan, Taiwan

Wen-Ko Chiou
‚úČ 259 Wen-Hwa 1st Road, Kwei-Shan, Tao-Yuan, Taiwan, R.O.C.
Email: wkchiu@mail.cgu.edu.tw
Publish Date
Received: 14-05-2014
Accepted: 08-09-2014
Published (online): 01-12-2014
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ABSTRACT

The present study aimed to investigate whether facial electromyography (EMG) recordings reflect the perception of effort and primary active lower limb muscle activity during incremental workload cycling. The effects of exercise intensity on EMG activity of the corrugator supercilii (CS), masseter and vastus lateralis (VL) muscles, heart rate (HR) and the rating of perceived exertion (RPE) were investigated, and the correlations among these parameters were determined. Eighteen males and 15 females performed continuous incremental workload cycling exercise until exhaustion. CS, masseter and VL muscle activities were continuously recorded using EMG during exercise. HR was also continuously monitored during the test. During the final 30 s of each stage of cycle ergometer exercise, participants were asked to report their feeling of exertion on the adult OMNI-Cycle RPE. HR and EMG activity of the facial muscles and the primary active lower limb muscle were strongly correlated with RPE; they increased with power output. Furthermore, facial muscle activity increased significantly during high-intensity exercise. Masseter muscle activity was strongly and positively correlated with HR, RPE and VL activity. The present investigation supports the view that facial EMG activity reflects the perception of effort. The jaw clenching facial expression can be considered an important factor for improving the reporting of perceived effort during high-intensity exercise in males and females.

Key words: Perceived exertion, facial electromyography, masseter muscle, corrugator supercilii muscle, incremental exercise testing


           Key Points
  • Frowning and jaw clenching muscle activity reflects the perception of effort during incremental workload cycling.
  • EMG activity of the masseter muscle was strongly and positively correlated with RPE, HR and lower limb EMG activity during incremental workload cycling.
  • The jaw clenching facial expression can be considered an important factor for estimating the intensity of effort.
 
 
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