A Study on Difference of Motor Abilities between Right-limbs and Left-limbs

Abstract

Measurements of the motor abilities were completed within seven months from January to July in 1968. The number of the subjects were 121 and they were all healthy ordinary males. The subjects aged 16 years old are of the second year class in Kisarazu Technical College. The results obtained were as follows; 1. As shown in table 1, Left-arm motor abilities are inferior in comparison with Right-arm motor abilities, and the mean value of the individual abilities were got about 93 percent to that of Right-arm motor abilities. 2. With regard to Left-arm, extensor strength are more inferior than flexor strength, including muscular-power and muscular-endurence as compared with Right-arm motor abilities. (Table 1) 3. The differences of motor abilities between Right and Left legs are comparatively small inclusive of all factors, and Left-leg motor abilities are superior in comparison to Right-leg motor abilities, exclusive of muscular-speed and muscular-coordination, and the mean value of the individual abilities were got about 102 percent to that of Right-leg motor abilities. (Table 1 shows the result) 4. Considering the correlation between measured values in the same factor, considerably high coefficient of correlations were obtained including ability value and rate of ability to Right-limbs motor ability both arm and leg. (Table 2) 5. In respects to arm motor abilities, a significant correlations were found, between muscular-power and the other many factors. (Table 2) 6. Observing the correlation between arm motor abilities and leg motor abilities in the same factor, significant correlations were found exclusive of muscular-speed in connection with record, but no significant correlations were found as respect to rates of abilities. (Table 2 shows the result) 7. As shown in figure 1 and table 5, there were more persons that idealy give credence to Right-side predominance than practical number, and it was less person that idealy give credence to Left-side predominance than practical number, in all factors both arm and leg. Particulary it was found a great accidental error as regards to legs.