The tightening parameters of the vibratory devices modify their disturbing postural effects

JOURNAL OF BIOMECHANICS

卷:126

Article

Maitre, Julien¹  Noe, Frederic¹  Gonzalez, Luis-Millan²  Garcia-Masso, Xavier³  Paillard, Thierry¹ 

[1] Univ Pau & Pays Adour, E2S UPPA, Lab Mouvement Equilibre Performance & Sante, 11 Rue Morane Saulnier, F-65000 Tarbes, France

[2] Univ Valence, Dept Educ Fis & Deportes, Fac Ciencies Activitat Fis & Esport, Valencia, Spain

[3] Univ Valence, Dept Didact Expressio Mus Plast & Corporal, Valencia, Spain

关键词: Balance;    Postural control;    Vibration;    Proprioception;    Sensory manipulation;    Tightening;   

DOI  :  10.1016/j.jbiomech.2021.110624

来源: Elsevier

【 摘 要 】

The purpose was to specify the impact of two different forces exerted by vibratory devices on the Achilles tendon on postural balance. The postural balance of 13 participants was evaluated on a force platform in two 40 s bipedal stance conditions with closed eyes. Tendon vibrations (80 Hz) were triggered 10 s after the beginning of the postural evaluation and applied during 20 s. Two levels of the force exerted by the vibrators were calibrated using load cells to control the tightening parameters of the vibrators: a strong tightening (ST) condition at 45 N and a light tightening (LT) condition at 5 N. The soleus electromyographic (EMG) activity and the spatiotemporal parameters of displacement of the centre of foot pressure (COP) were analysed. To analyse the effects of the introduction, the adaptation and the end of the stimulation, non-parametric tests were used. The results indicated that the soleus EMG activity increased only in the ST condition. However, during the vibration the anteroposterior COP position was significantly more in a backward position in the LT condition. At the end of the vibration, COP parameters increased more in the LT condition than the ST condition. This study demonstrated that the effects of the vibration depended on the force exerted by the devices on the tendons. The ST increased the vibration effects on EMG activity through greater stimulating effects compared to the LT. However, the ST could also increase the ankle joint stiffness and/or somaesthetic sensory information, which attenuated the COP backward shift.

【 授权许可】

Free