Chinese Journal of Tissue Engineering Research ›› 2018, Vol. 22 ›› Issue (19): 3021-3026.doi: 10.3969/j.issn.2095-4344.0283

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How fatigue affects loads and balance ability of lower extremity joints from leaping to ground?

Gui Zhu, Yuan Yi-wen, Sha Yan   

  1. School of Physical Education, Southwest Medical University, Luzhou 646000, Sichuan Province, China
  • Online:2018-07-08 Published:2018-07-08
  • About author:Gui Zhu, Master, Teaching assistant, School of Physical Education, Southwest Medical University, Luzhou 646000, Sichuan Province, China

Abstract:

BACKGROUND: Ability of muscle control will be decreased when human body is in fatigue. However, the loads and balance ability of lower extremity joints from leaping to ground after fatigue are unclear.

OBJECTIVE: To investigate the effect of fatigue on the kinematics, dynamics and dynamic and static balance of the lower extremity joints in athletes, so as to provide an important reference for preventing sports injuries.
METHODS: Sixteen elite male volleyball players were induced to suffer from muscle fatigue using the closed kinetic chain action. Corresponding motion parameters of leaping dynamics, kinematics and plantar pressure center measured by Vicon infrared image acquisition system and three-dimensional force were collected.
RESULTS AND CONCLUSION: (1) The maximal hip flexion angle, the movement range and the range of motion of knee joint after fatigue were significantly lower than those before fatigue (P < 0.05). (2) The time to maximum knee flexion was decreased significantly after fatigue than that before fatigue, and the maximum ground reaction force was significantly increased after fatigue (P < 0.05). (3) The dynamic and static balance in the center of pressure offset radius, velocity and the cover area were significantly increased after fatigue (P < 0.05). (4) These results indicate that the subjects tend to take a relatively stiff action for leaping after fatigue, in order to maintain a stable posture as soon as possible. The balance ability is significantly reduced after fatigue. As a result, the impact force from leaping to ground cannot be effectively reduced, thereby increasing the risk of sports injuries.

中国组织工程研究杂志出版内容重点:人工关节;骨植入物;脊柱骨折;内固定;数字化骨科;组织工程

Key words: Postural Balance, Athletic Injuries, Range of Motion, Articular, Tissue Engineering

CLC Number: