Effects of a Different Load Intensity on Adaptation of Standing Balance

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  • 負荷強度の相違が立位バランスの適応能に与える影響
  • フカ キョウド ノ ソウイ ガ タチイ バランス ノ テキオウノウ ニ アタエル エイキョウ

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Abstract

[Purpose] We investigated through postural sway the postural response, reaction time, and peak muscle activities and times in response to an external perturbation of differing intensity after standing balance adaptation. [Subjects] The subjects were 10 healthy persons. [Method] Subjects stood on top of a movable plate set on a postural sway recorder. External perturbation at the same intensity (Pert A) was delivered 10 times. For the eleventh trial, an external perturbation of lower intensity (Pert B) was delivered, and we investigated and compared the differences between Pert A and Pert B. [Results] Postural sway showed a significant increase for Pert B, and we found a significant delay in the peak activity time of the tibialis anterior, and a significant lowering of the peak value of the rectus femoris. We did not find a significant difference between the reaction times. [Conclusion] The results suggest that when an external perturbation of differing intensity is delivered after standing balance adaptation, muscle strength is not exerted efficaciously.<br>

Journal

  • Rigakuryoho Kagaku

    Rigakuryoho Kagaku 27 (6), 693-696, 2012

    The Society of Physical Therapy Science

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