《Chinese Journal of Rehabilitation Theory and Practice》 ›› 2020, Vol. 26 ›› Issue (8): 947-954.doi: 10.3969/j.issn.1006-9771.2020.08.014

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Effect of Vibration Training with Different Frequencies on Lower Limb Muscle Strength and Symptoms of Knee Osteoarthritis in Old Adults

LIU Heng1,YE Shu2()   

  1. 1. Sport College, Chongqing University, Chongqing 401331, China
    2. Sichuan Sports Science Research Institute, Chengdu, Sichuan 610041, China
  • Received:2020-03-09 Revised:2020-04-10 Published:2020-08-25 Online:2020-08-31
  • Contact: YE Shu E-mail:304119610@qq.com
  • Supported by:
    Central University General Program(2015CDJXY)

Abstract:

Objective To explore the effect of vibration training with different frequencies on muscle strength and symptoms of lower limb joints in the elderly suffering from knee osteoarthritis (KOA). Methods From July to October, 2019, 82 KOA elderly were randomly divided into control group (n = 20), low frequency group (n = 20), medium frequency group (n = 21) and high frequency group (n = 21). The latter three groups received 15 Hz, 30 Hz and 45 Hz vibration training, respectively, with the same amplitude (3 mm), 15 minutes a time, three times a week, for 16 weeks. The flexion and extension isokinetic muscle strength (60°/s and 180°/s) of lower limb joints were tested, and they were assessed with Western Ontario and McMaster Universities Osteoarthritis Index before and after training.Results After training, the peak torques of knee extensor under 60°/s and 180°/s increased in the medium frequency group (|t| > 2.162, P <0.05), the peak torques of knee and ankle extensors under 60°/s and 180°/s increased in the high frequency group (| t| > 2.227, P <0.05), the endurance of hip and knee extensors increased (| t| > 1.997, P < 0.05), and the score of pain significantly decreased ( t = 16.901, P < 0.001) in the high frequency group. After training, the peak torques of knee and ankle extensors under 60°/s, the endurance of hip and knee extensors were higher in the high frequency group than in the low frequency group and the medium frequency group ( P< 0.05); the peak torques of hip, knee and ankle extensors under 180°/s were higher in the high frequency group than in the low frequency group (P< 0.05); the score of pain was lower in the high frequency group than in other groups (P< 0.05).Conclusion 45 Hz vibration training could improve the absolute force and explosive force of knee and ankle extensors, and the endurance of hip and knee extensors; and relieve pain in KOA elderly.

Key words: vibration training, knee osteoarthritis, aged, muscle strength, symptoms

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