CHARACTARIZATION OF MOTOR UNITS IN VOLUNTARY CONTRACTION : A RELATIONSHIP BETWEEN RECRUITMENT ORDER AND THE GRADIENT OF TENSION INCREASE

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概要

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• In order to examine variations in the recruitment order of motor units, voluntary contraction of m. vastus medialis was studied at various gradients of tension increase. Two inserted electrodes were used for the recording of spike discharges of two or three motor units. Spike discharges were recorded simultaneously with the value of tension of knee extension and with the integrated value of surface electromyograms (EMG). The threshold value of a motor unit depended on the gradient G (kg/sec) of the tension increase. A similar change was also found in the latency time T_l(sec), where T_l is the time interval from the onset of EMG to the moment of recruitment of a motor unit. The relation T_l=pG^<-1+λ> was experimentally found, where p is a proportional constant. The motor unit with a positive/negative value of λ is characterized to be static/phasic.

• 日本体力医学会の論文
• 1974-12-01

著者

• くらた ひろし

  Department Of Physiology The Jikei University School Of Medicine

関連論文

• CHARACTARIZATION OF MOTOR UNITS IN VOLUNTARY CONTRACTION : A RELATIONSHIP BETWEEN RECRUITMENT ORDER AND THE GRADIENT OF TENSION INCREASE
• LONG PERIOD CONSTANCY OF THRESHOLD FORCE OF SINGLE MOTOR UNITS IN VOLUNTARY CONTRACTION AND ITS CHANGE INDUCED BY DESIRE FOR MICTURITION
• FINE CONTROL OF VOLUNTARY CONTRACTION : SINGLE SPIKE DISCHARGES OF SINGLE MOTOR UNITS WITHOUT DISPLAY OF SPIKES

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