M. Miyashita

Contribution of the body parts to throwing performance

The human body, mechanically speaking, comprises a system of levers capable only of rotary motions. Most human movement consists of a series of rotations of many segments of the body. The more rotations that are brought into the action, if they are timed in sequence, the higher the final speed of the action.

Temporal patterns in running

Running is the end of a series of complex rotations of three leg levers. The purpose of this study was to reveal the temporal sequence in the rotary action of the leg in sprint running.

Measurement of the Reaction Time of Muscular Relaxation

The reaction time of muscular relaxation was investigated in the elbow flexors. The time interval from the onset of a light stimulus to the response of the elbow flexors was measured using EMG. The subjects were 20 healthy male adults. There was no difference in the reaction time between muscular relaxation and muscular contraction. In terms of mean values for twenty subjects, there was no significant difference in the electrical response of M.biceps brachii between muscular contraction and relaxation. Significant individual differences were noted.

Photographic method of analyzing the pressure distribution of the foot against the ground

Most human activities are based on the movement of both legs. Therefore, in order to analyze the mechanics of human activities, it is essential to record the forces exerted against the ground through the feet.

Biomechanics of bowling

Although many books and papers describing bowling techniques have been published, there is little information dealing with the mechanics of bowling. The present study was undertaken to investigate bowling performances by analyzing with cinematography the motion of the bowling ball during the approach and delivery.