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 ( 2019 ) 18 , 248 - 252

Research article
Muscle Activity Pattern with A Shifted Center of Pressure during the Squat Exercise
Tetsuro Kitamura1,2, Akira Kido2, , Yukako Ishida2, Yasuyo Kobayashi2, Shinji Tsukamoto2, Yasuhito Tanaka1
Author Information
1 Department of Orthopedic Surgery, Nara Medical University, Nara, Japan
2 Department of Rehabilitation Medicine, Nara Medical University Hospital, Nara, Japan

Akira Kido
‚úČ MD, PhD Department of Rehabilitation Medicine, Nara Medical University Hospital, 840 Shijo-cho, Kashihara, Nara Japan
Email: akirakid@naramed-u.ac.jp
Publish Date
Received: 08-10-2018
Accepted: 06-03-2019
Published (online): 01-06-2019
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ABSTRACT

The squat exercise is a fundamental movement in athletic training and rehabilitation. In this study, we measured muscle activities in a normal squat posture (NSP) and a squat posture with the center of foot pressure (COP) intentionally shifted forward as far as possible (FSP). Ten healthy men performed double-limb squats, adopting the NSP and FSP, with three knee flexion angles (30, 60, and 90 degrees). The muscle activities of the vastus medialis (VM), semitendinosus (ST), tibialis anterior (TA), and gastrocnemius muscle lateral head (GL) were measured using surface electromyography, and activity patterns were analyzed. Compared to that for the NSP, the COP was significantly shifted forward in the FSP by at least 30% of the foot length for all knee flexion angles (p < 0.05). At all knee flexion angles, VM muscle activity significantly decreased, while GL muscle activity increased, in the FSP compared to that for the NSP (p < 0.05). In addition, ST muscle activity increased significantly in the FSP compared to that for the NSP at knee flexion angles of 30 and 60 degrees (p < 0.05). TA muscle activity significantly decreased in the FSP compared to that for the NSP at only 90 degrees of knee flexion (p < 0.05). These results demonstrate that muscle activity patterns vary significantly according to squat posture. Thus, the active control of the COP position during the squat can be a new training approach in targeting specific muscle groups.

Key words: Body weight squats, surface electromyogram, stabilometer, forward-shifted posture, rehabilitation


           Key Points
  • We measured muscle activities in a NSP and a squat posture with the COP intentionally shifted forward as far as possible.
  • Muscle activity patterns vary significantly according to squat posture.
  • The active control of the COP position during the squat can be a new training approach in targeting specific muscle groups.
 
 
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