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  1. Miho Morita,
  2. Yukio Urabe,
  3. Eri Fujii,
  4. Nobuaki Moriyama,
  5. Takahiko Yamamoto,
  6. Takuya Takeuchi,
  7. Shogo Tsutsumi,
  8. Shuhei Numano,
  9. Yuta Suzuki,
  10. Noriaki Maeda
  1. Graduate School of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan


    Background Balance training is a common component of rehabilitation after ankle sprains. A relatively high activity of the peroneus longus (PL) to the activity of the tibialis anterior (TA) (a low TA/PL ratio) is reported as an effective muscle activity pattern during balance training to prevent inversion ankle sprains. To date, no research has investigated ankle muscle activity during tilting movements on a wobble board.

    Objective To assess the magnitude of muscle activity of the ankle while inversion and eversion movements of the ankle joint are performed on a wobble board.

    Design Single-session randomized repeated-measures study design.

    Setting University laboratory.

    Participants Seventeen young adults (11 females and 6 males) with no history of ankle injury.

    Interventions Participants performed tilting movements on a wobble board in a medial and lateral direction while balancing on their non-dominant leg. The frequency of the movement was set at 40 bpm. Muscle activity of the TA and the PL during five cycles of inversion-eversion movements were collected and stored for analysis.

    Main Outcome Measurements Normalized RMS EMG values (percentage of each participant's maximum voluntary isometric contraction; %MVIC) of the TA and PL, along with TA/PL ration in the inversion (wobble board tilted in the lateral direction) and eversion (wobble board tilted in the medial direction) phase.

    Results There was a significant difference in muscle activity of the PL (inversion phase; 41.6±15.3%MVIC, eversion phase; 59.2±21.5% MVIC, p<0.01) and TA/PL ratio (inversion phase; 52.6±22.3%, eversion phase; 34.1±16.3%, p<0.01). There was no significant difference in muscle activity of the TA (p>0.05).

    Conclusions The results of the present study indicate that tilting movements on a wobble board in the medial direction (eversion of the ankle joint) may be favorable as an exercise modality after inversion ankle sprains as a high PL activity and a low TA/PL ratio was acquired.

    • Injury

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