Abstract
The purpose of this study is to examine how the somatic-autonomic integration works in the motor learning. The coordinating tester was used to investigate changes in muscular activities, cardiac responses and respiratory responses.
1) The process of tracking diagrams by the coordinating tester was regarded as a motor learning from learning curves and the electromyogram (EMG) recorded from the acrominal part of m. deltoideus.
2) The sustaining bursts of EMG during exercise were observed in the first trial and the amplitude of EMG was more than 150μV.
3) The active period of EMG during exercise was not completely differentiated from the silent period in the 6 th and 26 th trials and the amplitude of EMG was 60 to 80 μV.
4) The active period of EMG during exercise was completely differentiated from the silent period in the 42 nd trial and the amplitude of EMG was 50 to 100μV.
5) The R-R interval of the electrocardiogram during rest fluctuated from 800 to 900 msec (67-75 beats/min) in subject F and during exercise approximately shortened to 550-600msec (100-108 beats/min) . As learning progressed, the cardiac acceleration was enhanced in the anticipatory and the initial phase of the exercise. It is considered that this conditional enhancement was established in feedforward control systems from the cortico-hypothalamic systems.
6) The R-R intervals during rest and exercise were shortened to about 700-800 msec (75-85 beats/min) in subject W in the first trial, which was taken as the oriental reflex. As learning progressed, changes of the R-R interval during rest (about 1, 000 msec, 60 beats/min) were differentiated from during exercise (about 600-700 msec, 85-100 beats/min) .
7) The respiratory rates during rest before exercise were 15 to 21 breaths/min and after exercise fluctuated from 12 to 36 breaths/min. Although the respiratory rates during exercise except for the first trial were 20-30 breaths/min, the rates in the first trial reached 30-36 breaths/min, which was also regarded as the oriental reflex.
As organization of the somatic nervous system produced the automatic muscle activities after motor learning, it is considered that actions of the automatic nervous system enhanced the anticipatory and initial cardiac accelerations to exercise.
