A STUDY OF PURSUIT ENDURANCE MOVEMENTS ON LEG MUSCLE STRENGTH

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  • 脚筋力による持続追従運動の解析
  • キャクキンリョク ニヨル ジゾク ツイジュウ ウンドウ ノ カイセキ

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Abstract

The purpose of this study is to clarify the function of many pursuit movements on the leg muscle strength. As the means of this experiment, the endurance strength of the under-leg muscle was used and the sitting position was applied. Pursuit movements indicated are to track one target of four kinds waves showing on the oscillograph, which consist of 1) sinus, 2) triangular, 3) rectangular, and 4) sawtooth waves and various frequency ranges (0.1-0.9Hz) . The condition of the tracking movements is to maintain the added muscle strength of 1/2 level of maximum strength as long as one can be possible.<BR>To record the effects of the experiment, following items were adopted : 1) EMG 2) Heart Rate 3) Target curve 4) Pursuit curve 5) Error values between both curves 6) Phase changes between both curves. These records were analyzed by the method of auto-control theory and following points were obtained.<BR>1. The optimal limit of the wave frequency on the pursuit endurance movement were about 0.5Hz.<BR>2. The sawtooth wave target was easy and good performance to track the leg muscle strength and had the longest endurance time to maintain also.<BR>3. Near the all-out condition of the pursuit, the amplitude of EMG in the M. Rectus Femoralis and the beats of Heart Rate increased gradually till twice times as the fresh condition but there were no changes of EMG and H.R. according to the variety of wave sorts and frequency.<BR>4. The phase difference between the target and controlled waves was reversed at the fast frequency of 0.7Hz more, and under 0.6Hz, this phase was supported somehow.<BR>5. As the control element of the pursuit movent, the leg muscle effecter showed the high amplified gain in proportion to the endurance time and the high frequency.

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